IOS开发笔记

 1 iphone开发笔记

 3 退回输入键盘

 4 - (BOOL) textFieldShouldReturn:(id)textField{

 5 [textField resignFirstResponder];

 8 CGRect

 9 CGRect frame = CGRectMake (origin.x, origin.y, size.width, size.height)；矩形

 10 NSStringFromCGRect(someCG) 把CGRect结构转变为格式化字符串；

 11 CGRectFromString(aString) 由字符串恢复出矩形；

 12 CGRectInset(aRect) 创建较小或较大的矩形（中心点相同），＋较小 －较大

 13 CGRectIntersectsRect(rect1, rect2) 判断两矩形是否交叉，是否重叠

 14 CGRectZero 高度和宽度为零的／位于（0，0）的矩形常量

 16 CGPoint CGSize

 17 CGPoint aPoint = CGPointMake(x, y); 

 18 CGSize aSize = CGSizeMake(width, height);

 20 设置透明度

 21 [myView setAlpha:value]; (0.0 value 1.0)

 23 设置背景色 

 24 [myView setBackgroundColor:[UIColor redColor]]; 

 25 (blackColor;darkGrayColor;lightGrayColor;

 26 whiteColor;grayColor; redColor; greenColor; 

 27 blueColor; cyanColor;yellowColor;

 28 magentaColor;orangeColor;purpleColor;

 29 brownColor; clearColor; )

 31 自定义颜色

 32 UIColor *newColor = [[UIColor alloc]

 33 initWithRed:(float) green:(float) blue:(float) alpha:(float)]; 

 34 0.0~1.0

 36 竖屏

 37 320X480

 39 横屏

 40 480X320 

 42 状态栏高 (显示时间和网络状态)

 43 20 像素 

 45 导航栏、工具栏高(返回)

 46 44像素

 48 隐藏状态栏

 49 [[UIApplication shareApplication] setStatusBarHidden: YES animated:NO]

 51 横屏

 52 [[UIApplication shareApplication] 

 53 setStatusBarOrientation:UIInterfaceOrientationLandscapeRight].

 55 屏幕变动检测

 56 orientation == UIInterfaceOrientationLandscapeLeft

 58 全屏

 59 window=[[UIWindow alloc] initWithFrame:[UIScreen mainScreen] bounds]; 

 61 自动适应父视图大小：

 62 aView.autoresizingSubviews = YES;

 63 aView.autoresizingMask = (UIViewAutoresizingFlexibleWidth | 

 64 UIViewAutoresizingFlexibleHeight);

 66 定义按钮

 67 UIButton *scaleUpButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];

 68 [scaleUpButton setTitle:@"放 大" forState:UIControlStateNormal];

 69 scaleUpButton.frame = CGRectMake(40, 420, 100, 40);

 70 [scaleUpButton addTarget:self

 71 action:@selector(scaleUp) 

 72 forControlEvents:UIControlEventTouchUpInside];

 74 设置视图背景图片

 75 UIImageView *aView;

 76 [aView setImage:[UIImage imageNamed:@”name.png”]];

 77 view1.backgroundColor = [UIColor colorWithPatternImage:

 78 [UIImage imageNamed:@"image1.png"]];

 80 自定义UISlider的样式和滑块

 82 我们使用的是UISlider的setMinimumTrackImage，和setMaximumTrackImage方法来定义图片的，这两个方法可以设置滑块左边和右边的图片的，不过如果用的是同一张图片且宽度和控件宽度基本一致，就不会有变形拉伸的后果，先看代码，写在 viewDidLoad中：

 83 //左右轨的图片

 84 UIImage *stetchLeftTrack= [UIImage imageNamed:@"brightness_bar.png"];

 85 UIImage *stetchRightTrack = [UIImage imageNamed:@"brightness_bar.png"];

 86 //滑块图片

 87 UIImage *thumbImage = [UIImage imageNamed:@"mark.png"];

 89 UISlider *sliderA=[[UISlider alloc]initWithFrame:CGRectMake(30, 320, 257, 7)];

 90 sliderA.backgroundColor = [UIColor clearColor];

 91 sliderA.value=1.0;

 92 sliderA.minimumValue=0.7;

 93 sliderA.maximumValue=1.0;

 95 [sliderA setMinimumTrackImage:stetchLeftTrack forState:UIControlStateNormal];

 96 [sliderA setMaximumTrackImage:stetchRightTrack forState:UIControlStateNormal];

 97 //注意这里要加UIControlStateHightlighted的状态，否则当拖动滑块时滑块将变成原生的控件

 98 [sliderA setThumbImage:thumbImage forState:UIControlStateHighlighted];

 99 [sliderA setThumbImage:thumbImage forState:UIControlStateNormal];

 100 //滑块拖动时的事件

 101 [sliderA addTarget:self action:@selector(sliderValueChanged:) forControlEvents:UIControlEventValueChanged];

 102 //滑动拖动后的事件

 103 [sliderA addTarget:self action:@selector(sliderDragUp:) forControlEvents:UIControlEventTouchUpInside];

 104 

 105 [self.view addSubview:sliderA]; 

 106 

 107 为了大家实验方便，我附上背景图brightness_bar.png和滑块图mark.png

 108 http://pic002.cnblogs.com/images/2011/162291/2011121611431816.png

 109 http://pic002.cnblogs.com/images/2011/162291/2011121611432897.png

 110 

 111 -(IBAction)sliderValueChanged:(id)sender{

 112 UISlider *slider = (UISlider *) sender;

 113 NSString *newText = [[NSString alloc] initWithFormat:@”%d”, (int)(slider.value + 0.5f)];

 114 label.text = newText;

 115 }

 116 

 117 活动表单 

 118 UIActionSheetDelegate 

 119 

 120 - (IBActive) someButtonPressed:(id) sender

 121 {

 122 UIActionSheet *actionSheet = [[UIActionSheet alloc] 

 123 initWithTitle:@”Are you sure?”

 124 delegate:self

 125 cancelButtonTitle:@”No way!”

 126 destructiveButtonTitle:@”Yes, I’m Sure!”

 127 otherButtonTitles:nil];

 128 [actionSheet showInView:self.view];

 129 [actionSheet release];

 130 }

 131 

 132 警告视图 

 133 UIAlertViewDelegate 

 134 

 135 - (void) actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger) buttonIndex

 136 {

 137 if(buttonIndex != [actionSheet cancelButtonIndex])

 138 {

 139 NSString *message = [[NSString alloc] initWithFormat:@”You can 

 140 breathe easy, everything went OK.”];

 141 UIAlertView *alert = [[UIAlertView alloc] 

 142 initWithTitle:@”Something was done”

 143 message:message

 144 delegate:self

 145 cancelButtonTitle:@”OK”

 146 otherButtonTitles:nil];

 147 [alert show];

 148 [alert release];

 149 [message release];

 150 }

 151 }

 152 

 153 动画效果

 154 -(void)doChange:(id)sender

 155 {

 156 if(view2 == nil)

 157 {

 158 [self loadSec];

 159 }

 160 [UIView beginAnimations:nil context:NULL];

 161 [UIView setAnimationDuration:1]; 

 162 [UIView setAnimationTransition:([view1 superview]?UIViewAnimationTransitionFlipFromLeft:UIViewAnimationTransitionFlipFromRight)forView:self.view cache:YES];

 163 

 164 if([view1 superview]!= nil)

 165 {

 166 [view1 removeFromSuperview];

 167 [self.view addSubview:view2];

 168 

 169 }else {

 170 

 171 [view2 removeFromSuperview];

 172 [self.view addSubview:view1];

 173 }

 174 [UIView commitAnimations];

 175 }

 176 

 177 Table View UITableViewDateSource 

 178 #pragma mark -

 179 #pragma mark Table View Data Source Methods

 180 //指定分区中的行数，默认为1

 181 - (NSInteger)tableView:(UITableView *)tableView 

 182 numberOfRowsInSection:(NSInteger)section

 183 {

 184 return [self.listData count];

 185 }

 186 

 187 //设置每一行cell显示的内容

 188 - (UITableViewCell *)tableView:(UITableView *)tableView 

 189 cellForRowAtIndexPath:(NSIndexPath *)indexPath

 190 {

 191 static NSString *SimpleTableIndentifier = @"SimpleTableIndentifier";

 192 UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:SimpleTableIndentifier];

 193 if (cell == nil) {

 194 cell = [[[UITableViewCell alloc] 

 195 initWithStyle:UITableViewCellStyleSubtitle 

 196 reuseIdentifier:SimpleTableIndentifier] 

 197 autorelease];

 198 }

 199 UIImage *image = [UIImage imageNamed:@"13.gif"];

 200 cell.imageView.image = image;

 201 

 202 NSUInteger row = [indexPath row];

 203 cell.textLabel.text = [listData objectAtIndex:row];

 204 cell.textLabel.font = [UIFont boldSystemFontOfSize:20];

 205 

 206 if(row 5)

 207 cell.detailTextLabel.text = @"Best friends";

 208 else 

 209 cell.detailTextLabel.text = @"friends";

 210 return cell;

 211 }

 212 

 213 图像、文本标签和详细文本标签

 214 

 215 图像：如果设置图像，则它显示在文本的左侧； 文本标签：这是单元的主要文本（UITableViewCellStyleDefault 只显示文本标签）；详细文本标签：这是单元的辅助文本，通常用作解释性说明或标签

 216 

 217 UITableViewCellStyleSubtitle

 218 UITableViewCellStyleDefault

 219 UITableViewCellStyleValue1

 220 UITableViewCellStyleValue2

 221 

 222 UITableViewDelegate 

 223 #pragma mark -

 224 #pragma mark Table View Delegate Methods

 225 //把每一行缩进级别设置为其行号

 226 - (NSInteger)tableView:(UITableView *)tableView indentationLevelForRowAtIndexPath:(NSIndexPath *)indexPath

 227 {

 228 NSUInteger row = [indexPath row];

 229 return row;

 230 }

 231 //获取传递过来的indexPath值

 232 - (NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath

 233 {

 234 NSUInteger row = [indexPath row];

 235 if (row == 0) 

 236 return nil;

 237 return indexPath;

 238 }

 239 

 240 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath

 241 {

 242 NSUInteger row = [indexPath row];

 243 NSString *rowValue = [listData objectAtIndex:row];

 244 NSString *message = [[NSString alloc] initWithFormat:@"You selected %@",rowValue];

 245 UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Row Selected"

 246 message:message

 247 delegate:nil

 248 cancelButtonTitle:@"Yes, I did!"

 249 otherButtonTitles:nil];

 250 [alert show];

 251 [alert release];

 252 [message release];

 253 [tableView deselectRowAtIndexPath:indexPath animated:YES];

 254 }

 255 

 256 //设置行的高度

 257 - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath

 258 {

 259 return 40;

 260 }

 261 

 262 NavigationController 推出push 推出pop

 263 [self.navigationController pushViewController:_detailController animated:YES];

 264 [self.navigationController popViewControllerAnimated:YES];

 265 

 266 Debug:

 267 NSLog(@"%s %d", __FUNCTION__, __LINE__);

 268 

 269 点击textField外的地方回收键盘

 270 

 271 先定义一个UIControl类型的对象，在上面可以添加触发事件，令SEL实践为回收键盘的方法,最后将UIControl的实例加到当前View上。

 272 UIControl *m_control = [[UIControl alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];

 273 [m_control addTarget:self action:@selector(keyboardReturn) 

 274 forControlEvents:UIControlEventTouchUpInside];

 275 [self.view addSubview:m_control];

 276 

 277 - (void) keyboardReturn

 278 {

 279 [aTextField resignFirstResponder];

 280 }

 281 

 282 键盘覆盖输入框

 283 当键盘调出时将输入框覆盖时，可以用下方法：

 284 - (BOOL)textFieldShouldBeginEditing:(UITextField *)textField

 285 {

 286 [self.view setFrame:CGRectMake(0, -100, 320, 480) ];

 287 return YES;

 288 }

 289 - (BOOL)textFieldShouldEndEditing:(UITextField *)textField

 290 {

 291 [self.view setFrame:CGRectMake(0, 0, 320, 480)];

 292 return YES;

 293 }

 294 当准备输入时，将视图的位置上调100，这样键盘就不能覆盖到输入框。

 295 

 296 当依赖注入方法不好使时，可以在AppDelegate内申明一个全局的控制器实例_anotherViewController，在另一个需要使用_anotherViewController的地方定义以下委托方法，使用共享的UIApplication实例来获取该委托的引用

 297 SomeAppDelegate *appDelegate = (SomeAppDelegate *)[[UIApplication sharedApplication] delegate];

 298 _anotherViewController = appDelegate._anotherViewController; 

 299 

 300 UIViewController内建Table View

 301 

 302 纯代码在UIViewController控制器内建Table View

 303 @interface RootViewController : UIViewController UITableViewDelegate, UITableViewDataSource {

 304 NSArray *timeZoneNames;

 305 }

 306 @property (nonatomic,retain) NSArray *timeZoneNames;

 307 @end

 308 

 309 (void) loadView

 310 {

 311 UITableView *tableView = [[UITableView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]] style: UITableViewStylePlain];

 312 tableView.autoresizingMask = (UIViewAutoresizingFlexibleHeight | UIViewAutoresizingWidth);

 313 tableView.delegate = self;

 314 tableView.dataSource = self;

 315 [tableView reloadData];

 316 

 317 self.view = tableView;

 318 [tableView release];

 319 }

 320 

 321 

 322 将plist文件中的数据赋给数组

 323 NSString *thePath = [[NSBundle mainBundle] pathForResource:@"States" ofType:@"plist"];

 324 NSArray *array = [NSArray arrayWithContentsOfFile:thePath];

 325 

 326 UITouch

 327 手指的触摸范围：64X64 

 328 

 329 #pragma mark -

 330 #pragma mark Touch Events

 331 

 332 - (void)touchesBegan:(NSSet *) touches withEvent:(UIEvent *) event {

 333 originFrame = bookCover.frame;

 334 NSLog(@"%s %d", __FUNCTION__,__LINE__);

 335 

 336 if ([touches count] == 2) 

 337 {

 338 NSArray *twoTouches = [touches allObjects];

 339 UITouch *firstTouch = [twoTouches objectAtIndex:0];

 340 UITouch *secondTouch = [twoTouches objectAtIndex:1];

 341 CGPoint firstPoint = [firstTouch locationInView:bookCover];

 342 CGPoint secondPoint = [secondTouch locationInView:bookCover];

 343 

 344 CGFloat deltaX = secondPoint.x - firstPoint.x;

 345 CGFloat deltaY = secondPoint.y - firstPoint.y; 

 346 initialDistance = sqrt(deltaX * deltaX + deltaY * deltaY ); 

 347 frameX = bookCover.frame.origin.x;

 348 frameY = bookCover.frame.origin.y;

 349 frameW = bookCover.frame.size.width;

 350 frameH = bookCover.frame.size.height;

 351 NSLog(@"%s %d", __FUNCTION__,__LINE__);

 352 }

 353 }

 354 

 355 - (void)touchesMoved:(NSSet *) touches withEvent:(UIEvent *) event { 

 356 

 357 if([touches count] == 2)

 358 { 

 359 NSLog(@"%s %d", __FUNCTION__,__LINE__);

 360 

 361 NSArray *twoTouches = [touches allObjects];

 362 UITouch *firstTouch = [twoTouches objectAtIndex:0];

 363 UITouch *secondTouch = [twoTouches objectAtIndex:1];

 364 

 365 CGPoint firstPoint = [firstTouch locationInView:bookCover];

 366 CGPoint secondPoint = [secondTouch locationInView:bookCover];

 367 

 368 CGFloat deltaX = secondPoint.x - firstPoint.x;

 369 CGFloat deltaY = secondPoint.y - firstPoint.y; 

 370 CGFloat currentDistance = sqrt(deltaX * deltaX + deltaY * deltaY ); 

 371 

 372 if (initialDistance == 0) {

 373 initialDistance = currentDistance;

 374 }

 375 else if (currentDistance != initialDistance)

 376 {

 377 CGFloat changedDistance = currentDistance - initialDistance;

 378 NSLog(@"changedDistance = %f",changedDistance);

 379 [bookCover setFrame:CGRectMake(frameX - changedDistance / 2, 

 380 frameY - (changedDistance * frameH) / (2 * frameW),

 381 frameW + changedDistance, 

 382 frameH + (changedDistance * frameH) / frameW)];

 383 }

 384 }

 385 }

 386 

 387 - (void)touchesEnded:(NSSet *) touches withEvent:(UIEvent *) event {

 388 UITouch *touch = [touches anyObject];

 389 

 390 UITouch双击图片变大/还原

 391 if ([touch tapCount] == 2) 

 392 {

 393 NSLog(@"%s %d", __FUNCTION__,__LINE__);

 394 

 395 if (!flag) {

 396 [bookCover setFrame:CGRectMake(bookCover.frame.origin.x - bookCover.frame.size.width / 2,

 397 bookCover.frame.origin.y - bookCover.frame.size.height / 2,

 398 2 * bookCover.frame.size.width, 

 399 2 * bookCover.frame.size.height)];

 400 flag = YES;

 401 }

 402 else {

 403 [bookCover setFrame:CGRectMake(bookCover.frame.origin.x + bookCover.frame.size.width / 4, bookCover.frame.origin.y + bookCover.frame.size.height / 4,

 404 bookCover.frame.size.width / 2, bookCover.frame.size.height / 2)]; 

 405 flag = NO;

 406 }

 407 } 

 408 }

 409 

 410 Get the Location of Touches

 411 (CGPoint)locationInView:(UIView *)view

 412 (CGPoint)previousLocationInView:(UIView *)view

 413 view window

 414 

 415 Getting Touch Attributes

 416 tapCount(read only) timestamp(read only) phase(read only)

 417 

 418 Getting a Touch Objects Gesture Recognizers

 419 gestureRecognizers 

 420 

 421 Touch Phase

 422 UITouchPhaseBegan

 423 UITouchPhaseMoved

 424 UITouchPhaseStationary

 425 UITouchPhaseEnded

 426 UITouchPhaseCancelled

 427 

 428 从Plist里读内容

 429 NSString *plistPath = [[NSBundle mainBundle] pathForResource:@"book" ofType:@"plist"];

 430 NSDictionary *dictionary = [[NSDictionary alloc] initWithContentsOfFile:plistPath];

 431 NSString *book = [dictionary objectForKey:bookTitle];

 432 [textView setText:book];

 433 

 434 (void) initialize {

 435 NSUserDefaults = [NSUserDefaults standardUserDefaults];

 436 NSDictionary *appDefaults = [NSDictionary dictionaryWithObject:@"YES" forKey:@"DeleteBackup"];

 437 [defaults registerDefaults:appDefaults];

 438 }

 439 

 440 To get a value of a default, use the valueForKey: method:

 441 [[theDefaultsController values] valueForKey:@"userName"];

 442 To set a value for a default, use setValue:forKey:

 443 [[theDefaultsController values] setValue:newUserName forKey:@"userName"];

 444 

 445 [[NSUserDefaults standardUserDefaults] setValue:aVale forKey:aKey];

 446 [[NSUserDefaults standardUserDefaults] valueForKey:aKey];

 447 

 448 获取Documents目录

 449 NSArray *paths = NSSearchPathForDictionariesInDomains(NSDocumentDirectory, 

 450 NSUserDomainMask, YES);

 451 NSString *documentsDirectory = [paths objectAtIndex:0];

 452 NSString *filename = [documentsDirectory 

 453 stringByAppendingPathComponent:@"theFile.txt"];

 454 

 455 获取tmp目录

 456 NSString *tempPath = NSTemporaryDirectory();

 457 NSString *tempFile = [tempPath stringByAppendingPathComponent:@"tempFile.txt"];

 458 

 459 [[NSUserDefaults standardUserDefaults] setObject:data forKey:@"someKey"];

 460 [[NSUserDefaults standardUserDefaults] objectForKey:aKey];

 461 

 462 自定义NavigationBar

 463 navigationBar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];

 464 [navigationBar setBarStyle:UIBarStyleBlackOpaque];

 465 

 466 myNavigationItem = [[UINavigationItem alloc] initWithTitle:@"Setting"];

 467 [navigationBar setItems:[NSArray arrayWithObject:myNavigationItem]];

 468 [self.view addSubview:navigationBar];

 469 

 470 backButton = [[UIBarButtonItem alloc] initWithTitle:@"Back" style:UIBarButtonItemStylePlain target:self action:@selector(back)];

 471 myNavigationItem.leftBarButtonItem = backButton;

 472 

 473 

 474 利用Safari打开一个链接

 475 NSURL *url = [NSURL URLWithString:@"http://www.cnblogs.com/tracy-e/"];

 476 [[UIApplication sharedApplication] openURL:url];

 477 

 478 利用UIWebView显示pdf文件、网页。。。

 479 webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];

 480 [webView setDelegate:self];

 481 [webView setScalesPageToFit:YES];

 482 [webView setAutoresizingMask:UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight];

 483 [webView setAllowsInlineMediaPlayback:YES];

 484 [self.view addSubview:webView];

 485 NSString *pdfPath = [[NSBundle mainBundle] pathForResource:@"ojc" ofType:@"pdf"]; 

 486 NSURL *url = [NSURL fileURLWithPath:pdfPath]; 

 487 NSURLRequest *request = [NSURLRequest requestWithURL:url 

 488 cachePolicy:NSURLRequestUseProtocolCachePolicy

 489 timeoutInterval:5];

 490 [webView loadRequest:request];

 491 

 492 

 493 [myWebView loadRequest:[NSURLRequest requestWithURL:[NSURL 

 494 URLWithString: @"http://www.cnblogs.com/tracy-e/"]]];

 495 

 496 NSString *errorString = [NSString stringWithFormat:@" html center font size= 

 497 +5 color =red An Error Occurred: br %@ /fone /center /html ",error];

 498 [myWebView loadHTMLString:errorString baseURL:nil];

 499 

 500 //Stopping a load request when the view is to disappear

 501 - (void)viewWillDisappear:(BOOL)animate{

 502 if ([myWebView loading]){

 503 [myWebView stopLoading];

 504 }

 505 myWebView.delegate = nil;

 506 [UIApplication shareApplication].networkActivityIndicatorVisible = NO;

 507 }

 508 

 509 汉字转码

 510 NSString *oriString = @"\u67aa\u738b";

 511 NSString *escapedString = [oriString 

 512 stringByReplacingPercentEscapesUsingEncoding: NSUTF8StringEncoding];

 513 

 514 

 515 Checking for background support on earlier versions of iOS

 516 UIDevice *device = [UIDevice currentDevice];

 517 BOOL backgroundSupported = NO;

 518 if ([device respondsToSelector:@selector(isMultitaskingSupported)]){

 519 backgroundSupported = device.multitaskingSupported;

 520 }

 521 

 522 Being a Responsible,Multitasking-Aware Application 

 523 # Do not make any OpenGL ES calls from your code.

 524 # Cancel any Bonjour-related services before being suspended.

 525 # Be prepared to handle connection failures in your network-based sockets.

 526 # Save your application state before moving to the background.

 527 # Release any unneeded memory when moving to the background.

 528 # Stop using shared system resources before being suspended.

 529 # Avoid updating your windows and views.

 530 # Respond to connect and disconnect notification for external accessories.

 531 # Clean up resource for active alerts when moving to the background.

 532 # Remove sensitive information from views before moving to the background.

 533 # Do minimal work while running in the background.

 534 

 535 Handing the Keyboard notifications

 536 //Call this method somewhere in your view controller setup code

 537 - (void) registerForKeyboardNotifications{

 538 

 539 [[NSNotificationCenter defaultCenter] addObserver:self

 540 selector:@selector(keyboardWasShown:)

 541 name:UIKeyboardDidShowNotification 

 542 object:nil];

 543 [[NSNotificationCenter defaultCenter] addObserver:self

 544 selector:@selector(keyboardWasHidden:)

 545 name:UIKeyboardDidHideNotification

 546 object:nil];

 547 

 548 }

 549 

 550 //Called when the UIKeyboardDidShowNotification is sent

 551 - (void)keyboardWasShown:(NSNotification *) aNotification{

 552 if(keyboardShown)

 553 return;

 554 NSDictionary *info = [aNotification userInfo];

 555 

 556 //get the size of the keyboard. 

 557 NSValue *aValue = [info objectForKey:UIKeyboardFrameBeginUserInfoKey];

 558 CGSize keyboardSize = [aValue CGRectValue].size;

 559 

 560 //Resize the scroll view 

 561 CGRect viewFrame = [scrollView frame];

 562 viewFrame.size.height -= keyboardSize.height;

 563 

 564 //Scroll the active text field into view

 565 CGRect textFieldRect = [activeField frame];

 566 [scrollView scrollRectToVisible:textFieldRect animated:YES];

 567 

 568 keyboardShown = YES; 

 569 }

 570 

 571 //Called when the UIKeyboardDidHideNotification is sent

 572 - (void)keyboardWasHidden:(NSNotification *) aNotification{

 573 NSDictionary *info = [aNotification userInfo];

 574 

 575 //Get the size of the keyboard.

 576 NSValue *aValue = [info objectForKey:UIKeyboardFrameEndUserInfoKey];

 577 CGSize keyboardSize = [aValue CGRectValue].size;

 578 

 579 //Reset the height of the scroll view to its original value

 580 CGRect viewFrame = [scrollView Frame];

 581 viewFrame.size.height += keyboardSize.height;

 582 scrollView.frame = viewFrame;

 583 

 584 keyboardShown = NO;

 585 }

 586 

 587 点击键盘的next按钮，在不同的textField之间换行

 588 //首先给不同的textField赋不同的且相邻的tag值

 589 - (BOOL)textFieldShouldReturn:(UITextField *)textField

 590 {

 591 if ([textField returnKeyType] != UIReturnKeyDone)

 592 { 

 593 NSInteger nextTag = [textField tag] + 1;

 594 UIView *nextTextField = [[self tableView] viewWithTag:nextTag];

 595 [nextTextField becomeFirstResponder];

 596 }

 597 else {

 598 [textField resignFirstResponder];

 599 }

 600 return YES;

 601 } 

 602 

 603 Configuring a date formatter 

 604 - (void)viewDidLoad {

 605 [super viewDidLoad];

 606 dateFormatter = [[NSDateFormatter alloc] init];

 607 [dateFormatter setGeneratesCalendarDates:YES];

 608 [dateFormatter setLocale:[NSLocale currentLocale]];

 609 [dateFormatter setCalendar:[NSCalendar autoupdatingCurrentCalendar]];

 610 [dateFormatter setTimeZone:[NSTimeZone defaultTimeZone]];

 611 [dateFormatter setDateStyle:NSDateFormatterShortStyle];

 612 DOB.placeholder = [NSString stringWithFormat:@"Example: %@",[dateFormatter stringFromDate:[NSDate date]]];

 613 }

 614 

 615 - (void)textFieldDidEndEditing:(UITextField *)textField{

 616 [textField resignFirstResponder];

 617 if ([textField.text isEqualToString:@""])

 618 return;

 619 switch (textField.tag){

 620 case DOBField:

 621 NSDate *theDate = [dateFormatter dateFromString:textField.text];

 622 if (theDate)

 623 [inputDate setObject:theDate forKey:MyAppPersonDOBKey];

 624 break;

 625 default:

 626 break;

 627 }

 628 }

 629 

 630 tableView的cell高度

 631 

 632 tableView的cell高度除了在delegate中指定外，还可以在任意位置以[tableView setRowHeight:44]的方式指定

 633 

 634 [[self navigationItem] setLeftBarButtonItem:[self editButtonItem]];

 635 

 636 - (void)setEditing:(BOOL)editing animated:(BOOL)animated{

 637 [super setEditing:editing animated:animated];

 638 if (editing){

 639 ...... 

 640 }

 641 else{

 642 ......

 643 } 

 644 }

 645 

 646 One added a subview to a view, release the subview to avoid the extra retain count of it, Because when you insert a view as a subview using addSubview:, the subview is retained by its superview. When you remove the subview from its superview using the removeFromSuperview: method, subview is autoreleased.

 647 

 648 为UINavigationBar设置背景图片

 649 在iPhone开发中, 有时候我们想给导航条添加背景图片, 实现多样化的导航条效果, 用其他方法往往无法达到理想的效果, 经过网上搜索及多次实验, 确定如下最佳实现方案:

 650 为UINavigatonBar增加如下Category(类别:提供一种为某个类添加方法而又不必编写子类的途径,类别只能添加成员函数，不能添加数据成员):

 651 

 652 @implementation UINavigationBar (CustomImage) 

 653 - (void)drawRect:(CGRect)rect { 

 654 UIImage *image = [UIImage imageNamed: @"NavigationBar.png"]; 

 655 [image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)]; 

 656 } 

 657 @end 

 658 

 659 例如, 在我的项目中, 添加如下代码:

 660 ///////////////////////////////////////////////////////// 

 661 /* input: The image and a tag to later identify the view */ 

 662 @implementation UINavigationBar (CustomImage) 

 663 - (void)drawRect:(CGRect)rect { 

 664 UIImage *image = [UIImage imageNamed: @"title_bg.png"]; 

 665 [image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)]; 

 666 } 

 667 @end 

 668 ///////////////////////////////////////////////////////// 

 669 @implementation FriendsPageViewController 

 670 // Implement viewDidLoad to do additional setup after loading the view, typically from a nib. 

 671 - (void)viewDidLoad { 

 672 self.navigationBar.tintColor = [UIColor purpleColor]; 

 673 

 674 [self initWithRootViewController:[[RegPageViewController alloc] init]]; 

 675 [super viewDidLoad]; 

 676 } 

 677 ...... 

 678 实现的效果如下图:

 679 

 680 

 681 转载，原文地址 http://blog.csdn.net/wave_1102/archive/2009/11/04/4768212.aspx

 682 

 683 为UINavigationBar添加自定义背景

 684 

 685 @implementation UINavigationBar (UINavigationBarCategory) 

 686 

 687 - (void)drawRect:(CGRect)rect { 

 688 //颜色填充 

 689 // UIColor *color = [UIColor redColor]; 

 690 // CGContextRef context = UIGraphicsGetCurrentContext(); 

 691 // CGContextSetFillColor(context, CGColorGetComponents( [color CGColor])); 

 692 // CGContextFillRect(context, rect); 

 693 // self.tintColor = color; 

 694 //图片填充 

 695 UIColor *color = [UIColor colorWithRed:46.0f/255.0f 

 696 green:87.0f/255.0f blue:29.0f/255.0f alpha:1.0f];

 697 

 698 UIImage *img = [UIImage imageNamed: @"bg.png"]; 

 699 [img drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)]; 

 700 

 701 self.tintColor = color; 

 702 } 

 703 

 704 @end

 705 

 706 加载图片要及时release

 707 

 708 你还在使用myImage = [UIImage imageNamed:@"icon.png"]; 吗？ 

 709 

 710 如题，是不是大家为了方便都这样加载图片啊

 711 

 712 myImage = [UIImage imageNamed:@"icon.png"];

 713 

 714 那么小心了

 715 

 716 这种方法在一些图片很少，或者图片很小的程序里是ok的。

 717 

 718 但是，在大量加载图片的程序里，请千万不要这样做。

 719 

 720 为什么呢 ？？？？？？？

 721 

 722 这种方法在application bundle的顶层文件夹寻找由供应的名字的图象。 如果找到图片，装载到iPhone系统缓存图象。那意味图片是(理论上)放在内存里作为cache的。

 723 

 724 试想你图片多了，是什么后果？ 

 725 

 726 图片cache极有可能不会响应 memory warnings and release its objects

 727 

 728 所以，用图片的时候一定要小心的alloc和release。

 729 

 730 推荐使用 NSString *path = [[NSBundle mainBundle] pathForResource:@"icon" ofType:@"png"];

 731 

 732 myImage = [UIImage imageWithContentsOfFile:path];

 733 

 734 // Todo use of myImage

 735 

 736 [myImage release];

 737 

 738 From: http://www.cocoachina.com/bbs/simple/?t27420.html 

 739 

 740 uiwebview打开doc,pdf文件

 741 UIWebView *webView = [[UIWebView alloc]initWithFrame:CGRectMake(0, 55, 320, 300)];

 742 webView.delegate = self;

 743 webView.multipleTouchEnabled = YES;

 744 webView.scalesPageToFit = YES;

 745 

 746 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

 747 NSString *documentsDirectory = [paths objectAtIndex:0];

 748 NSString *docPath = [documentsDirectory stringByAppendingString:@"/doc2003_1.doc"]; NSLog(@"#######%@",docPath);

 749 

 750 NSURL *url = [NSURL fileURLWithPath:docPath];

 751 NSURLRequest *request = [NSURLRequest requestWithURL:url];

 752 [webView loadRequest:request];

 753 

 754 [self.view addSubview:webView];

 755 [webView release];

 756 

 757 From:http://blog.csdn.net/dadalan/archive/2010/10/22/5959301.aspx 

 758 

 759 iPhone游戏中既播放背景音乐又播放特效声音的办法

 760 

 761 有时候在 iPhone 游戏中，既要播放背景音乐，同时又要播放比如枪的开火音效。此时您可以试试以下方法

 762 

 763 NSString *musicFilePath = [[NSBundle mainBundle] pathForResource:fileName ofType:@"wav"]; //创建音乐文件路径

 764 NSURL *musicURL = [[NSURL alloc] initFileURLWithPath:musicFilePath]; 

 765 AVAudioPlayer* musicPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:musicURL error:nil];

 766 [musicURL release];

 767 [musicPlayer prepareToPlay];

 768 //[musicPlayer setVolume:1]; //设置音量大小

 769 //musicPlayer .numberOfLoops = -1;//设置音乐播放次数 -1为一直循环

 770 

 771 要导入框架 AVFoundation.framework，头文件中 #import AVFoundation/AVFoundation.h ；做成类的话则更方便。

 772 

 773 From: http://blog.csdn.net/dadalan/archive/2010/10/19/5950493.aspx 

 774 

 775 NSNotificationCenter用于增加回调函数

 776 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(_willBecomeActive) name:UIApplicationDidBecomeActiveNotification object:nil];

 777 

 778 UINavigationBar 背景Hack

 779 LOGO_320×44.png 图片显示在背景上，

 780 

 781 @implementation UINavigationBar (UINavigationBarCategory)

 782 - (void)drawRect:(CGRect)rect {

 783 //加入旋转坐标系代码

 784 // Drawing code 

 785 UIImage *navBarImage = [UIImage imageNamed:@"LOGO_320×44.png"];

 786 CGContextRef context = UIGraphicsGetCurrentContext();

 787 CGContextTranslateCTM(context, 0.0, self.frame.size.height);

 788 CGContextScaleCTM(context, 1.0, -1.0); 

 789 

 790 CGPoint center=self.center;

 791 

 792 CGImageRef cgImage= CGImageCreateWithImageInRect(navBarImage.CGImage, CGRectMake(0, 0, 1, 44));

 793 CGContextDrawImage(context, CGRectMake(center.x-160-80, 0, 80, self.frame.size.height), cgImage);

 794 CGContextDrawImage(context, CGRectMake(center.x-160, 0, 320, self.frame.size.height), navBarImage.CGImage);

 795 CGContextDrawImage(context, CGRectMake(center.x+160, 0, 80, self.frame.size.height), cgImage);

 796 }

 797 @end

 798 

 799 old code

 800 CGContextDrawImage(context, CGRectMake(0, 0, self.frame.size.width, self.frame.size.height), navBarImage.CGImage);

 801 

 802 hack 过logo 不再拉伸

 803 

 804 From: http://blog.163.com/fengyi1103@126/blog/static/13835627420106279102671/ 

 805 

 806 清除电话号码中的其他符号（源码）

 807 

 808 最近从通讯录读取电话号码，读出得号码如：134－1814－****。

 809 而我需要的为11位纯数字，一直找方法解决此问题，今天终于找到了。。

 810 分享一下……

 811 

 812 代码如下：

 813 

 814 NSString *originalString = @"(123) 123123 abc";

 815 NSMutableString *strippedString = [NSMutableString 

 816 stringWithCapacity:originalString.length];

 817 

 818 NSScanner *scanner = [NSScanner scannerWithString:originalString];

 819 NSCharacterSet *numbers = [NSCharacterSet 

 820 characterSetWithCharactersInString:@"0123456789"];

 821 

 822 while ([scanner isAtEnd] == NO) {

 823 NSString *buffer;

 824 if ([scanner scanCharactersFromSet:numbers intoString: buffer]) {

 825 [strippedString appendString:buffer];

 826 }

 827 // --------- Add the following to get out of endless loop

 828 else {

 829 [scanner setScanLocation:([scanner scanLocation] + 1)];

 830 } 

 831 // --------- End of addition

 832 }

 833 

 834 NSLog(@"%@", strippedString); // "123123123"

 835 

 836 From： http://stackoverflow.com/questions/1129521/remove-all-but-numbers-from-nsstring 

 837 

 838 

 839 正则判断：字符串只包含字母和数字

 840 

 841 NSString *mystring = @"Letter1234";

 842 NSString *regex = @"[a-z][A-Z][0-9]";

 843 

 844 NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];

 845 

 846 if ([predicate evaluateWithObject:mystring] == YES) {

 847 //implement

 848 }

 849 

 850 

 851 一行代码设置 UITableViewCell 与导航条间距

 852 

 853 UITableView 的 cell 默认出现在 uitableview 的第一行，如果你想自定义 UITableViewCell 与导航条间距的话，可以使用下面这行代码

 854 

 855 tableview.tableHeaderView = [[[UIView alloc] initWithFrame:CGRectMake(0, 0, 5, 20)]autorelease];

 856 

 857 From: http://blog.163.com/fengyi1103@126/blog/static/1383562742010101611107492/ 

 858 

 859 

 860 修改 UITableview 滚动条颜色的方法

 861 

 862 UITableview 的滚动条默认颜色是黑色的，如果 UItableview 背景也是深颜色，则滚动条会变的很不明显。您可以用下面这行代码来改变滚动条的颜色

 863 

 864 self.tableView.indicator "didReceiveResponseHeaders %@",[m_request.responseHeaders valueForKey:@"Content-Length"]);

 878 ｝

 879 

 880 网络编程总结 iphone

 881 

 882 一：确认网络环境3G/WIFI

 883 

 884 1. 添加源文件和framework

 885 

 886 开发Web等网络应用程序的时候，需要确认网络环境，连接情况等信息。如果没有处理它们，是不会通过Apple的审(我们的)查的。

 887 Apple 的 例程 Reachability 中介绍了取得/检测网络状态的方法。要在应用程序程序中使用Reachability，首先要完成如下两部：

 888 

 889 1.1. 添加源文件：

 890 在你的程序中使用 Reachability 只须将该例程中的 Reachability.h 和 Reachability.m 拷贝到你的工程中。如下图：

 891 

 892 

 893 

 894 1.2.添加framework：

 895 将SystemConfiguration.framework 添加进工程。如下图：

 896 

 897 

 898 2. 网络状态

 899 

 900 Reachability.h中定义了三种网络状态：

 901 typedef enum {

 902 NotReachable = 0, //无连接

 903 ReachableViaWiFi, //使用3G/GPRS网络

 904 ReachableViaWWAN //使用WiFi网络

 905 } NetworkStatus;

 906 

 907 因此可以这样检查网络状态：

 908 

 909 Reachability *r = [Reachability reachabilityWithHostName:@“www.apple.com”];

 910 switch ([r currentReachabilityStatus]) {

 911 case NotReachable:

 912 // 没有网络连接

 913 break;

 914 case ReachableViaWWAN:

 915 // 使用3G网络

 916 break;

 917 case ReachableViaWiFi:

 918 // 使用WiFi网络

 919 break;

 920 }

 921 

 922 3.检查当前网络环境

 923 程序启动时，如果想检测可用的网络环境，可以像这样

 924 // 是否wifi

 925 + (BOOL) IsEnableWIFI {

 926 return ([[Reachability reachabilityForLocalWiFi] currentReachabilityStatus] != NotReachable);

 927 }

 928 

 929 // 是否3G

 930 + (BOOL) IsEnable3G {

 931 return ([[Reachability reachabilityForInternetConnection] currentReachabilityStatus] != NotReachable);

 932 }

 933 例子：

 934 - (void)viewWillAppear:(BOOL)animated { 

 935 if (([Reachability reachabilityForInternetConnection].currentReachabilityStatus == NotReachable) 

 936 ([Reachability reachabilityForLocalWiFi].currentReachabilityStatus == NotReachable)) {

 937 self.navigationItem.hidesBackButton = YES;

 938 [self.navigationItem setLeftBarButtonItem:nil animated:NO];

 939 }

 940 }

 941 

 942 4. 链接状态的实时通知

 943 网络连接状态的实时检查，通知在网络应用中也是十分必要的。接续状态发生变化时，需要及时地通知用户：

 944 

 945 Reachability 1.5版本

 946 // My.AppDelegate.h

 947 #import "Reachability.h"

 948 

 949 @interface MyAppDelegate : NSObject UIApplicationDelegate {

 950 NetworkStatus remoteHostStatus;

 951 }

 952 

 953 @property NetworkStatus remoteHostStatus;

 954 

 955 @end

 956 

 957 // My.AppDelegate.m

 958 #import "MyAppDelegate.h"

 959 

 960 @implementation MyAppDelegate

 961 @synthesize remoteHostStatus;

 962 

 963 // 更新网络状态

 964 - (void)updateStatus {

 965 self.remoteHostStatus = [[Reachability sharedReachability] remoteHostStatus];

 966 }

 967 

 968 // 通知网络状态

 969 - (void)reachabilityChanged:(NSNotification *)note {

 970 [self updateStatus];

 971 if (self.remoteHostStatus == NotReachable) {

 972 UIAlertView *alert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"AppName", nil)

 973 message:NSLocalizedString (@"NotReachable", nil)

 974 delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil];

 975 [alert show];

 976 [alert release];

 977 }

 978 }

 979 

 980 // 程序启动器，启动网络监视

 981 - (void)applicationDidFinishLaunching:(UIApplication *)application {

 982 

 983 // 设置网络检测的站点

 984 [[Reachability sharedReachability] setHostName:@"www.apple.com"];

 985 [[Reachability sharedReachability] setNetworkStatusNotificationsEnabled:YES];

 986 // 设置网络状态变化时的通知函数

 987 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:)

 988 name:@"kNetworkReachabilityChangedNotification" object:nil];

 989 [self updateStatus];

 990 }

 991 

 992 - (void)dealloc {

 993 // 删除通知对象

 994 [[NSNotificationCenter defaultCenter] removeObserver:self];

 995 [window release];

 996 [super dealloc];

 997 } 

 998 

 999 Reachability 2.0版本

1000 

1001 

1002 // MyAppDelegate.h

1003 @class Reachability;

1004 

1005 @interface MyAppDelegate : NSObject UIApplicationDelegate {

1006 Reachability *hostReach;

1007 }

1008 

1009 @end

1010 

1011 // MyAppDelegate.m

1012 - (void)reachabilityChanged:(NSNotification *)note {

1013 Reachability* curReach = [note object];

1014 NSParameterAssert([curReach isKindOfClass: [Reachability class]]);

1015 NetworkStatus status = [curReach currentReachabilityStatus];

1016 

1017 if (status == NotReachable) {

1018 UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"AppName""

1019 message:@"NotReachable"

1020 delegate:nil

1021 cancelButtonTitle:@"YES" otherButtonTitles:nil];

1022 [alert show];

1023 [alert release];

1024 }

1025 }

1026 

1027 - (void)applicationDidFinishLaunching:(UIApplication *)application {

1028 // ...

1029 

1030 // 监测网络情况

1031 [[NSNotificationCenter defaultCenter] addObserver:self

1032 selector:@selector(reachabilityChanged:)

1033 name: kReachabilityChangedNotification

1034 object: nil];

1035 hostReach = [[Reachability reachabilityWithHostName:@"www.google.com"] retain];

1036 hostReach startNotifer];

1037 // ...

1038 }

1039 

1040 

1041 二：使用NSConnection下载数据

1042 

1043 1.创建NSConnection对象，设置委托对象

1044 

1045 NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:[self urlString]]];

1046 [NSURLConnection connectionWithRequest:request delegate:self];

1047 

1048 2. NSURLConnection delegate委托方法

1049 - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response; 

1050 - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error; 

1051 - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data; 

1052 - (void)connectionDidFinishLoading:(NSURLConnection *)connection; 

1053 

1054 3. 实现委托方法

1055 - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {

1056 // store data

1057 [self.receivedData setLength:0]; //通常在这里先清空接受数据的缓存

1058 }

1059 

1060 - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {

1061 /* appends the new data to the received data */

1062 [self.receivedData appendData:data]; //可能多次收到数据，把新的数据添加在现有数据最后

1063 }

1064 

1065 - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {

1066 // 错误处理

1067 }

1068 

1069 - (void)connectionDidFinishLoading:(NSURLConnection *)connection {

1070 // disconnect

1071 [UIApplication sharedApplication].networkActivityIndicatorVisible = NO; 

1072 NSString *returnString = [[NSString alloc] initWithData:self.receivedData encoding:NSUTF8StringEncoding];

1073 NSLog(returnString);

1074 [self urlLoaded:[self urlString] data:self.receivedData];

1075 firstTimeDownloaded = YES;

1076 }

1077 

1078 三：使用NSXMLParser解析xml文件

1079 

1080 1. 设置委托对象，开始解析

1081 NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data]; //或者也可以使用initWithContentsOfURL直接下载文件，但是有一个原因不这么做：

1082 // Its also possible to have NSXMLParser download the data, by passing it a URL, but this is not desirable

1083 // because it gives less control over the network, particularly in responding to connection errors.

1084 [parser setDelegate:self];

1085 [parser parse];

1086 

1087 2. 常用的委托方法

1088 - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName 

1089 namespaceURI:(NSString *)namespaceURI

1090 qualifiedName:(NSString *)qName 

1091 attributes:(NSDictionary *)attributeDict;

1092 - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName 

1093 namespaceURI:(NSString *)namespaceURI 

1094 qualifiedName:(NSString *)qName;

1095 - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string;

1096 - (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError;

1097 

1098 static NSString *feedURLString = @"http://www.yifeiyang.net/test/test.xml";

1099 

1100 3. 应用举例

1101 - (void)parseXMLFileAtURL:(NSURL *)URL parseError:(NSError **)error

1102 {

1103 NSXMLParser *parser = [[NSXMLParser alloc] initWithContentsOfURL:URL];

1104 [parser setDelegate:self];

1105 [parser setShouldProcessNamespaces:NO];

1106 [parser setShouldReportNamespacePrefixes:NO];

1107 [parser setShouldResolveExternalEntities:NO];

1108 [parser parse];

1109 NSError *parseError = [parser parserError];

1110 if (parseError error) {

1111 *error = parseError;

1112 }

1113 [parser release];

1114 }

1115 

1116 - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI 

1117 qualifiedName:(NSString*)qName attributes:(NSDictionary *)attributeDict{

1118 // 元素开始句柄

1119 if (qName) {

1120 elementName = qName;

1121 }

1122 if ([elementName isEqualToString:@"user"]) {

1123 // 输出属性值

1124 NSLog(@"Name is %@ , Age is %@", [attributeDict objectForKey:@"name"], [attributeDict objectForKey:@"age"]);

1125 }

1126 }

1127 

1128 - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI 

1129 qualifiedName:(NSString *)qName

1130 {

1131 // 元素终了句柄

1132 if (qName) {

1133 elementName = qName;

1134 }

1135 }

1136 

1137 - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string

1138 {

1139 // 取得元素的text

1140 }

1141 

1142 NSError *parseError = nil;

1143 [self parseXMLFileAtURL:[NSURL URLWithString:feedURLString] parseError: parseError];

1144 

1145 Iphone 实现画折线图

1146 

1147 iphone里面要画图一般都是通过CoreGraphics.framwork和QuartzCore.framwork实现，apple的官方sdk demon中包含了QuartzCore的基本用法，

1148 

1149 

1150 具体demo请参考http://developer.apple.com/library/ios/#samplecode/QuartzDemo/

1151 折线图

1152 

1153 

1154 要实现折线图也就把全部的点连起来，movePointLineto，具体的调用里面的api就可以实现了，但是画坐标就比较麻烦了，里面需要去转很多，好在国外有人开源了一个画折线图的开发包，首先看看效果吧，具体怎么用可以参考作者git版本库中的wiki。

1155 http://github.com/devinross/tapkulibrary/wiki/How-To-Use-This-Library

1156 

1157 这个包还提供了其他的很好看的UI，都可以调来用，但是我们只需要一个画图要把整个包都导进去，工程太大了，既然是开源的那就想办法提取出来吧，原先之前也有人干过这样的事。http://duivesteyn.net/2010/03/07/iphone-sdk-implementing-the-tapku-graph-in-your-application/

1158 我对源代码进行简单的修改，使其显示坐标之类的，更加符合工程的需要，但是还没有实现画多组数据，只能画一组数据，不用viewContol，而使用addsubview，直接添加到当前的窗口，最终效果如下。

1159 使用方法：

1160 

1161 1.工程添加tk库里面的如下文件

1162 

1163 2. 添加QuartzCore framework 

1164 #import QuartzCore/QuartzCore.h 

1165 添加TapkuLibrary.bundle资源文件

1166 3.代码中完成实例，数据初始化就可以用了

1167 

1168 下载修改后的版本。下次有时间在整理一个工程版本出来。

1169 

1170 让iPhone屏幕常亮不变暗的方法

1171 

1172 如果您希望运行自己开发的App时，iPhone的屏幕不再自动变暗，可以使用以下方法让屏幕常亮： iPhone OS用一个布尔值用来控制是否取消应用程序空闲时间：@property(nonatomic, getter=isIdleTime 

1173 

1174 如果您希望运行自己开发的App时，iPhone的屏幕不再自动变暗，可以使用以下方法让屏幕常亮：

1175 

1176 iPhone OS用一个布尔值用来控制是否取消应用程序空闲时间：@property(nonatomic, getter=isIdleTimerDisabled) BOOL idleTimerDisabled。这个值的默认属性是"NO"。当大多数应用程序没有接收到用户输入信息的时候，系统会把设备设置成“休眠”状态，iPhone屏幕也会变暗。这样做是为了保存更多电量。事实上，应用程序在运行加速度游戏的时候是不需要用户输入的，当然这里只是一个假设，把这个变量设置为"YES"，来取消系统休眠的“空闲时间”。

1177 

1178 重点是：你必须当真正需要的时候才打开这个属性当你不用的时候马上还愿成"NO"。大多数应用程序在休眠时间到的时候让系统关闭屏幕。这个包括了有音频的应用程 序。在Audio Session Services中使用适当的回放和记录功能不会被间断当屏幕关闭时。只有地图应用程序，游戏或者一些不间断的用户交互程序可以取消这个属性。

1179 

1180 苹果开发网络编程知识总结

1181 

1182 以下苹果开发网络编程知识由 CocoaChina 会员 cocoa_yang 总结，希望能为苹果开发新手梳理知识脉络，节省入门时间。一：确认网络环境3G/WIFI 1. 添加源文件和framework 开发Web等网络应用程序 

1183 

1184 以下苹果开发网络编程知识由 CocoaChina 会员 “cocoa_yang” 总结，希望能为苹果开发新手梳理知识脉络，节省入门时间。

1185 

1186 一：确认网络环境3G/WIFI

1187 

1188 1. 添加源文件和framework

1189 

1190 开发Web等网络应用程序的时候，需要确认网络环境，连接情况等信息。如果没有处理它们，是不会通过Apple的审查的。

1191 Apple 的 例程 Reachability 中介绍了取得/检测网络状态的方法。要在应用程序程序中使用Reachability，首先要完成如下两部：

1192 

1193 1.1. 添加源文件：

1194 在你的程序中使用 Reachability 只须将该例程中的 Reachability.h 和 Reachability.m 拷贝到你的工程中。如下图：

1195 

1196 1.2.添加framework：

1197 将SystemConfiguration.framework 添加进工程。如下图：

1198 

1199 

1200 2. 网络状态

1201 

1202 Reachability.h中定义了三种网络状态：

1203 typedef enum {

1204 NotReachable = 0, //无连接

1205 ReachableViaWiFi, //使用3G/GPRS网络

1206 ReachableViaWWAN //使用WiFi网络

1207 } NetworkStatus;

1208 

1209 因此可以这样检查网络状态：

1210 

1211 Reachability *r = [Reachability reachabilityWithHostName:@“www.apple.com”];

1212 switch ([r currentReachabilityStatus]) {

1213 case NotReachable:

1214 // 没有网络连接

1215 break;

1216 case ReachableViaWWAN:

1217 // 使用3G网络

1218 break;

1219 case ReachableViaWiFi:

1220 // 使用WiFi网络

1221 break;

1222 }

1223 

1224 3.检查当前网络环境

1225 

1226 程序启动时，如果想检测可用的网络环境，可以像这样

1227 // 是否wifi

1228 + (BOOL) IsEnableWIFI {

1229 return ([[Reachability reachabilityForLocalWiFi] currentReachabilityStatus] != NotReachable);

1230 }

1231 

1232 // 是否3G

1233 + (BOOL) IsEnable3G {

1234 return ([[Reachability reachabilityForInternetConnection] currentReachabilityStatus] != NotReachable);

1235 }

1236 例子：

1237 - (void)viewWillAppear:(BOOL)animated { 

1238 if (([Reachability reachabilityForInternetConnection].currentReachabilityStatus == NotReachable) 

1239 ([Reachability reachabilityForLocalWiFi].currentReachabilityStatus == NotReachable)) {

1240 self.navigationItem.hidesBackButton = YES;

1241 [self.navigationItem setLeftBarButtonItem:nil animated:NO];

1242 }

1243 }

1244 

1245 4. 链接状态的实时通知

1246 

1247 网络连接状态的实时检查，通知在网络应用中也是十分必要的。接续状态发生变化时，需要及时地通知用户：

1248 

1249 Reachability 1.5版本

1250 // My.AppDelegate.h

1251 #import "Reachability.h"

1252 

1253 @interface MyAppDelegate : NSObject UIApplicationDelegate {

1254 NetworkStatus remoteHostStatus;

1255 }

1256 

1257 @property NetworkStatus remoteHostStatus;

1258 

1259 @end

1260 

1261 // My.AppDelegate.m

1262 #import "MyAppDelegate.h"

1263 

1264 @implementation MyAppDelegate

1265 @synthesize remoteHostStatus;

1266 

1267 // 更新网络状态

1268 - (void)updateStatus {

1269 self.remoteHostStatus = [[Reachability sharedReachability] remoteHostStatus];

1270 }

1271 

1272 // 通知网络状态

1273 - (void)reachabilityChanged:(NSNotification *)note {

1274 [self updateStatus];

1275 if (self.remoteHostStatus == NotReachable) {

1276 UIAlertView *alert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"AppName", nil)

1277 message:NSLocalizedString (@"NotReachable", nil)

1278 delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil];

1279 [alert show];

1280 [alert release];

1281 }

1282 }

1283 

1284 // 程序启动器，启动网络监视

1285 - (void)applicationDidFinishLaunching:(UIApplication *)application {

1286 

1287 // 设置网络检测的站点

1288 [[Reachability sharedReachability] setHostName:@"www.apple.com"];

1289 [[Reachability sharedReachability] setNetworkStatusNotificationsEnabled:YES];

1290 // 设置网络状态变化时的通知函数

1291 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:)

1292 name:@"kNetworkReachabilityChangedNotification" object:nil];

1293 [self updateStatus];

1294 }

1295 

1296 - (void)dealloc {

1297 // 删除通知对象

1298 [[NSNotificationCenter defaultCenter] removeObserver:self];

1299 [window release];

1300 [super dealloc];

1301 }

1302 

1303 Reachability 2.0版本

1304 

1305 

1306 // MyAppDelegate.h

1307 @class Reachability;

1308 

1309 @interface MyAppDelegate : NSObject UIApplicationDelegate {

1310 Reachability *hostReach;

1311 }

1312 

1313 @end

1314 

1315 // MyAppDelegate.m

1316 - (void)reachabilityChanged:(NSNotification *)note {

1317 Reachability* curReach = [note object];

1318 NSParameterAssert([curReach isKindOfClass: [Reachability class]]);

1319 NetworkStatus status = [curReach currentReachabilityStatus];

1320 

1321 if (status == NotReachable) {

1322 UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"AppName""

1323 message:@"NotReachable"

1324 delegate:nil

1325 cancelButtonTitle:@"YES" otherButtonTitles:nil];

1326 [alert show];

1327 [alert release];

1328 }

1329 }

1330 

1331 - (void)applicationDidFinishLaunching:(UIApplication *)application {

1332 // ...

1333 

1334 // 监测网络情况

1335 [[NSNotificationCenter defaultCenter] addObserver:self

1336 selector:@selector(reachabilityChanged:)

1337 name: kReachabilityChangedNotification

1338 object: nil];

1339 hostReach = [[Reachability reachabilityWithHostName:@"www.google.com"] retain];

1340 hostReach startNotifer];

1341 // ...

1342 }

1343 

1344 

1345 二：使用NSConnection下载数据

1346 

1347 1.创建NSConnection对象，设置委托对象

1348 

1349 NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:[self urlString]]];

1350 [NSURLConnection connectionWithRequest:request delegate:self];

1351 

1352 2. NSURLConnection delegate委托方法

1353 - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response; 

1354 - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error; 

1355 - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data; 

1356 - (void)connectionDidFinishLoading:(NSURLConnection *)connection; 

1357 

1358 3. 实现委托方法

1359 - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {

1360 // store data

1361 [self.receivedData setLength:0]; //通常在这里先清空接受数据的缓存

1362 }

1363 

1364 - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {

1365 /* appends the new data to the received data */

1366 [self.receivedData appendData:data]; //可能多次收到数据，把新的数据添加在现有数据最后

1367 }

1368 

1369 - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {

1370 // 错误处理

1371 }

1372 

1373 - (void)connectionDidFinishLoading:(NSURLConnection *)connection {

1374 // disconnect

1375 [UIApplication sharedApplication].networkActivityIndicatorVisible = NO; 

1376 NSString *returnString = [[NSString alloc] initWithData:self.receivedData encoding:NSUTF8StringEncoding];

1377 NSLog(returnString);

1378 [self urlLoaded:[self urlString] data:self.receivedData];

1379 firstTimeDownloaded = YES;

1380 }

1381 

1382 三：使用NSXMLParser解析xml文件

1383 

1384 1. 设置委托对象，开始解析

1385 NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data]; //或者也可以使用initWithContentsOfURL直接下载文件，但是有一个原因不这么做：

1386 // Its also possible to have NSXMLParser download the data, by passing it a URL, but this is not desirable

1387 // because it gives less control over the network, particularly in responding to connection errors.

1388 [parser setDelegate:self];

1389 [parser parse];

1390 

1391 2. 常用的委托方法

1392 - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName

1393 namespaceURI:(NSString *)namespaceURI

1394 qualifiedName:(NSString *)qName

1395 attributes:(NSDictionary *)attributeDict;

1396 - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName

1397 namespaceURI:(NSString *)namespaceURI

1398 qualifiedName:(NSString *)qName;

1399 - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string;

1400 - (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError;

1401 

1402 static NSString *feedURLString = @"http://www.yifeiyang.net/test/test.xml";

1403 

1404 3. 应用举例

1405 - (void)parseXMLFileAtURL:(NSURL *)URL parseError:(NSError **)error

1406 {

1407 NSXMLParser *parser = [[NSXMLParser alloc] initWithContentsOfURL:URL];

1408 [parser setDelegate:self];

1409 [parser setShouldProcessNamespaces:NO];

1410 [parser setShouldReportNamespacePrefixes:NO];

1411 [parser setShouldResolveExternalEntities:NO];

1412 [parser parse];

1413 NSError *parseError = [parser parserError];

1414 if (parseError error) {

1415 *error = parseError;

1416 }

1417 [parser release];

1418 }

1419 

1420 - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI

1421 qualifiedName:(NSString*)qName attributes:(NSDictionary *)attributeDict{

1422 // 元素开始句柄

1423 if (qName) {

1424 elementName = qName;

1425 }

1426 if ([elementName isEqualToString:@"user"]) {

1427 // 输出属性值

1428 NSLog(@"Name is %@ , Age is %@", [attributeDict objectForKey:@"name"], [attributeDict objectForKey:@"age"]);

1429 }

1430 }

1431 

1432 - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI

1433 qualifiedName:(NSString *)qName

1434 {

1435 // 元素终了句柄

1436 if (qName) {

1437 elementName = qName;

1438 }

1439 }

1440 

1441 - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string

1442 {

1443 // 取得元素的text

1444 }

1445 

1446 NSError *parseError = nil;

1447 [self parseXMLFileAtURL:[NSURL URLWithString:feedURLString] parseError: parseError];

1448 

1449 如何隐藏状态栏 

1450 [ UIApplication sharedApplication ].statusBarHidden = YES;

1451 

1452 .m 文件与.mm文件的区别 

1453 .m文件是object-c文件

1454 .mm文件相当于c++或者c文件

1455 

1456 NSLog(@"afd")与 NSLog("afd")

1457 

1458 细微差别会导致程序崩溃。

1459 

1460 但是我不太明白为何苹果要把编译器做的对这两种常量有区别。

1461 

1462 不过值得一提的是可能为了方便苹果自身的NSObject对象的格式化输出。

1463 

1464 safari其实没有把内存的缓存写到存储卡上 

1465 

1466 NSURLCache doesnt seem to support writing to disk on iPhone. The documentation for NSCachedURLResponse says that the NSURLCacheStoragePolicy "NSURLCacheStorageAllowed" is treated as "NSURLCacheStorageAllowedInMemoryOnly" by iPhone OS. 

1467 

1468 官方文档是这么说的。

1469 

1470 为了证明这个，我找到了一个目录。

1471 

1472 /private/var/mobile/Library/Caches/Safari/Thumbnails

1473 

1474 随机数的使用

1475 

1476 头文件的引用

1477 #import time.h 

1478 #import mach/mach_time.h 

1479 

1480 srandom()的使用

1481 srandom((unsigned)(mach_absolute_time() 0xFFFFFFFF));

1482 

1483 直接使用 random() 来调用随机数

1484 

1485 在UIImageView 中旋转图像

1486 

1487 float rotateAngle = M_PI;

1488 CGAffineTransform transform =CGAffineTransformMakeRotation(rotateAngle);

1489 imageView.transform = transform;

1490 

1491 以上代码旋转imageView, 角度为rotateAngle, 方向可以自己测试哦！

1492 

1493 

1494 在Quartz中如何设置旋转点

1495 

1496 UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"bg.png"]];

1497 imageView.layer.anchorPoint = CGPointMake(0.5, 1.0);

1498 

1499 这个是把旋转点设置为底部中间。记住是在QuartzCore.framework中才得到支持。

1500 

1501 创建.plist文件并存储

1502 

1503 NSString *errorDesc; //用来存放错误信息

1504 NSMutableDictionary *rootObj = [NSMutableDictionary dictionaryWithCapacity:4]; //NSDictionary, NSData等文件可以直接转化为plist文件

1505 NSDictionary *innerDict;

1506 NSString *name;

1507 Player *player;

1508 NSInteger saveIndex;

1509 

1510 for(int i = 0; i [playerArray count]; i++) {

1511 player = nil;

1512 player = [playerArray objectAtIndex:i];

1513 if(player == nil)

1514 break; 

1515 name = player.playerName;// This "Player1" denotes the player name could also be the computer name

1516 innerDict = [self getAllNodeInfoToDictionary:player];

1517 [rootObj setObject:innerDict forKey:name]; // This "Player1" denotes the person who start this game

1518 }

1519 player = nil;

1520 NSData *plistData = [NSPropertyListSerialization dataFromPropertyList:(id)rootObj format:NSPropertyListXMLFormat_v1_0 errorDescription: errorDesc];

1521 

1522 红色部分可以忽略，只是给rootObj添加一点内容。这个plistData为创建好的plist文件，用其writeToFile方法就可以写成文件。下面是代码：

1523 

1524 /*得到移动设备上的文件存放位置*/

1525 NSString *documentsPath = [self getDocumentsDirectory]; 

1526 NSString *savePath = [documentsPath stringByAppendingPathComponent:@"save.plist"];

1527 

1528 /*存文件*/

1529 if (plistData) {

1530 [plistData writeToFile:savePath atomically:YES];

1531 }

1532 else {

1533 NSLog(errorDesc);

1534 [errorDesc release];

1535 }

1536 

1537 - (NSString *)getDocumentsDirectory { 

1538 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 

1539 return [paths objectAtIndex:0]; 

1540 } 

1541 

1542 读取plist文件并转化为NSDictionary

1543 

1544 NSString *documentsPath = [self getDocumentsDirectory];

1545 NSString *fullPath = [documentsPath stringByAppendingPathComponent:@"save.plist"];

1546 NSMutableDictionary* plistDict = [[NSMutableDictionary alloc] initWithContentsOfFile:fullPath];

1547 

1548 读取一般性文档文件

1549 

1550 NSString *tmp;

1551 NSArray *lines; /*将文件转化为一行一行的*/

1552 lines = [[NSString stringWithContentsOfFile:@"testFileReadLines.txt"] 

1553 componentsSeparatedByString:@"\n"];

1554 

1555 NSEnumerator *nse = [lines objectEnumerator];

1556 

1557 // 读取 里的内容

1558 while(tmp = [nse nextObject]) {

1559 NSString *stringBetweenBrackets = nil;

1560 NSScanner *scanner = [NSScanner scannerWithString:tmp];

1561 [scanner scanUpToString:@" " intoString:nil];

1562 [scanner scanString:@" " intoString:nil];

1563 [scanner scanUpToString:@" " intoString: stringBetweenBrackets];

1564 

1565 NSLog([stringBetweenBrackets description]);

1566 }

1567 

1568 对于读写文件，还有补充，暂时到此。随机数和文件读写在游戏开发中经常用到。所以把部分内容放在这，以便和大家分享，也当记录，便于查找。

1569 

1570 隐藏NavigationBar

1571 [self.navigationController setNavigationBarHidden:YES animated:YES];

1572 

1573 在想隐藏的ViewController中使用就可以了。

1574 

1575 如何在iPhone程序中调用外部命令 

1576 

1577 下面是如何在iPhone非官方SDK程序中调用外部命令的方法。 

1578 

1579 - ( NSString * ) executeCommand : ( NSString * ) cmd { NSString * output = [ NSString string ] ; FILE * pipe = popen ( [ cmd cStringUsingEncoding : NSASCIIStringEnc

1580 

1581 下面是如何在iPhone非官方SDK程序中调用外部命令的方法。

1582 

1583 - (NSString *)executeCommand: (NSString *)cmd

1584 {

1585 NSString *output = [NSString string];

1586 FILE *pipe = popen([cmd cStringUsingEncoding: NSASCIIStringEncoding], "r");

1587 if (!pipe) return;

1588 

1589 char buf[1024];

1590 while(fgets(buf, 1024, pipe)) {

1591 output = [output stringByAppendingFormat: @"%s", buf];

1592 }

1593 

1594 pclose(pipe);

1595 return output;

1596 }

1597 

1598 NSString *yourcmd = [NSString stringWithFormat: @"your command"];

1599 [self executeCommand: yourcmd];

1600 

1601 如何在iPhone程序读取数据时显示进度窗

1602 

1603 下面代码说明如何使用iPhone 非官方SDK在读取数据时显示进度条。

1604 

1605 以下代码参考了MobileRss。

1606 

1607 定义头文件：

1608 

1609 #import "uikit/UIProgressHUD.h"

1610 

1611 @interface EyeCandy : UIApplication {

1612 UIProgressHUD *progress;

1613 }

1614 

1615 - (void) showProgressHUD:(NSString *)label withWindow:(UIWindow *)w withView:(UIView *)v withRect:(struct CGRect)rect;

1616 - (void) hideProgressHUD;

1617 

1618 .@end

1619 

1620 上面的引号要改成 。

1621 

1622 import "EyeCandy.h"

1623 

1624 @implementation EyeCandy

1625 - (void)showProgressHUD:(NSString *)label withWindow:(UIWindow *)w withView:(UIView *)v withRect:(struct CGRect)rect

1626 {

1627 progress = [[UIProgressHUD alloc] initWithWindow: w];

1628 [progress setText: label];

1629 [progress drawRect: rect];

1630 [progress show: YES];

1631 

1632 [v addSubview:progress];

1633 }

1634 

1635 - (void)hideProgressHUD

1636 {

1637 [progress show: NO];

1638 [progress removeFromSuperview];

1639 }

1640 

1641 @end

1642 

1643 使用下面代码调用：

1644 

1645 // Setup Eye Candy View

1646 _eyeCandy = [[[EyeCandy alloc] init] retain];

1647 

1648 // Call loading display

1649 [_eyeCandy showProgressHUD:@"Loading …" withWindow:window withView:mainView withRect:CGRectMake(0.0f, 100.0f, 320.0f, 50.0f)];

1650 

1651 // When finished for hiding the quot;loading text quot;

1652 [_eyeCandy hideProgressHUD];

1653 

1654 WebKit的基本用法 

1655 

1656 WebKit是苹果开发中比较常用的浏览器引擎，Safari使用的正是WebKit引擎。WebKit基于KDE的KHTML加以再开发，解析速度超过了以往所有的浏览器。这里简单记录一下WebKit的基本用法。

1657 

1658 WebKit由下面的结构组成：

1659 

1660 •DomCore 

1661 •JavaScriptCore 

1662 •WebCore 

1663 一般浏览

1664 

1665 要打开网页，可以这样做：

1666 

1667 1.[[webView mainFrame] loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:urlText]]];

1668 DomCore

1669 

1670 DomCore用于处理DOM文档，包括：

1671 

1672 •DOMDocument 

1673 •DOMNamedNodeMap 

1674 •DOMNode 

1675 •DOMNodeList 

1676 要获取一个DOMDocument，可以这样做：

1677 

1678 1.DOMDocument *myDOMDocument = [[webView mainFrame] DOMDocument];

1679 要用于HTML处理，可以使用DOMHTMLDocument（Mac OS X 10.4之后），获取方式相同：

1680 

1681 1.DOMHTMLDocument *myDOMDocument = (DOMHTMLDocument*)[[webView mainFrame] DOMDocument];

1682 方法定义：

1683 

1684 苹果的WebKit更新说明

1685 

1686 JavaScriptCore

1687 

1688 在WebKit中执行脚本的方法：

1689 

1690 1.WebScriptObject *myscript = [webView windowScriptObject];

1691 2.NSString *script = @"alert(hello);";

1692 3.[myscript evaluateWebScript script];

1693 参考：

1694 

1695 http://www.macgood.com/thread-24636-1-1.html

1696 

1697 http://www.cocoadev.com/index.pl?WebKit

1698 

1699 为什么不要做iPhone上面的应用

1700 

1701 简单来说就是因为两国的文化不同，或者说生活方式的不同。美国不管多穷的人都有车，他们平时的生活方式和国内绝对是完全不同的。做应用和做游戏不一样，应用需要满足人们某一

1702 简单来说就是因为两国的文化不同，或者说生活方式的不同。美国不管多穷的人都有车，他们平时的生活方式和国内绝对是完全不同的。做应用和做游戏不一样，应用需要满足人们某一部分的需求，比如，一个计算小费的软件，在国内不会有市场，可是美国人都有一个。

1703 大家可以设身处地的想一下，谁会需要你做的软件，这样的人有多少，这样的人又有iPhone的又有多少。

1704 

1705 对于应用来说，针对商务人士的又比针对普通人的好，基本上商务人士不太在乎几块钱一个软件，这也是backup assistant卖得最好的一个原因。这个软件一年的年费24美元，大约有数千万美元一年的收入。什么样的应用软件是这些人需要的？连笔者自己也不太清楚，笔者虽然已经在美国工作了多年，但是对于美国文化的了解还处于一知半解状态，更不用说正在留学的学生了。

1706 

1707 还有一个能成功的应用软件是你已经有非常多的数据，比如你有当地的所有加油站的信息，做一个油价的地图软件，显然市场会不错。不过数据要是美国的数据，国内的没有太大的帮助。

1708 

1709 综上所述，游戏比应用好做很多，如果要作应用的话，可以从单机的小应用开始。要在美国运营一个支持10万人的网络应用，没有30万美元绝对没戏。如果非要上，只能早死早超生了。

1710 

1711 获取iPhone用户手机号

1712 

1713 使用下面的函数可以返回用户的手机号：

1714 

1715 extern NSString *CTSettingCopyMyPhoneNumber();

1716 

1717 然后调用即可。

1718 

1719 由于这个函数是包含在CoreTelephony中，所以只能用于非官方iPhone SDK。

1720 

1721 在程序中关闭iPhone

1722 首先在程序中引用 #include sys/reboot.h 然后使用 reboot(RB_HALT); 就可以直接将iPhone关机。

1723 

1724 首先在程序中引用

1725 

1726 #include sys/reboot.h 

1727 

1728 然后使用

1729 

1730 reboot(RB_HALT);

1731 

1732 就可以直接将iPhone关机。

1733 

1734 convert the contents of an NSData object to an NSString

1735 

1736 1. NSString *stringFromASC = [NSString stringWithCString:[ascData bytes] length:[ascData length]];

1737 

1738 If the NSData object contains unichar characters then do this:

1739 

1740 NSString *stringFromUnichar = [NSString stringWithCharacters:[unicharData bytes] length:[unicharData length] / sizeof(unichar)];

1741 

1742 2. - (id)initWithData:(NSData *)data encoding:(NSStringEncoding)encoding

1743 

1744 iPhone的特殊URL

1745 在iPhone中，可以直接用UIApp打开URL地址。如下所示：

1746 

1747 1.[ UIApp openURL: [ NSURL URLWithString:@"http://www.apple.com" ] ];

1748 或者：

1749 

1750 1.[ UIApp openURL: [ NSURL URLWithString:@"mailto:apple@mac.com?Subject=hello" ] ];

1751 与此同时，iPhone还包含一些其他除了http://或者mailto:之外的URL： 

1752 

1753 sms:// 可以调用短信程序

1754 

1755 tel:// 可以拨打电话

1756 

1757 itms:// 可以打开MobileStore.app

1758 

1759 audio-player-event:// 可以打开iPod

1760 

1761 audio-player-event://?uicmd=show-purchased-playlist 可以打开iPod播放列表

1762 

1763 video-player-event:// 可以打开iPod中的视频

1764 

1765 

1766 get iphone uniqueIdentifier

1767 

1768 I also find that I can get uniqueIdentifier using:

1769 

1770 UIDevice *myDevice = [UIDevice currentDevice];NSString *identifier = myDevice.uniqueIdentifier;

1771 

1772 

1773 打开本地网页，与远程网页

1774 

1775 fileURLWithPath:Initializes and returns a newly created NSURL object as a file URL with a specified path.

1776 

1777 + (id)fileURLWithPath:(NSString *)path

1778 

1779 URLWithString:

1780 Creates and returns an NSURL object initialized with a provided string.

1781 

1782 + (id)URLWithString:(NSString *)URLString

1783 

1784 教你如何使用UIWebView

1785 

1786 Start by opening up the WebBrowserTutorialAppDelegate.h file and editing the @interface line to read:

1787 

1788 @interface WebBrowserTutorialAppDelegate : NSObject UIWebViewDelegate {

1789 What we have done is to make the main AppDelegate a delegate for the UIWebView as well.

1790 

1791 Now we need to set our webView to have the main AppDelegate as its delegate, you can do this by opening up WebBrowserTutorialAppDelegate.m and putting the following line just inside theapplicationDidFinishLaunching function:

1792 

1793 webView.delegate = self;

1794 That is all pretty self explanatory, it just sets the delegate of our webView to self, which in this case is our main application delegate.

1795 

1796 Now we are pretty much done, we just need to add the function to catch the link clicks. To do this we need to add a new function, copy the content below to the WebBrowserTutorialAppDelegate.m file:

1797 

1798 - (BOOL)webView:(UIWebView*)webView shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType)navigationType {

1799 NSURL *url = request.URL;

1800 NSString *urlString = url.absoluteString;

1801 NSLog(urlString);

1802 return YES;

1803 }

1804 This function will catch all requests and allow you to either manipulate them and pass them on or to perform your own custom action and stop the event from bubbling.

1805 

1806 The first line gets the URL of the request, this is the contents inside the href attribute in the anchor tag.

1807 The next line converts the URL to a string so we can log it out. You can access many parts of the NSURL, here are some of them and brief description of what they do.

1808 

1809 * absoluteString - An absolute string for the URL. Creating by resolving the receiver’s string against its base.

1810 * absoluteURL - An absolute URL that refers to the same resource as the receiver. If the receiver is already absolute, returns self.

1811 * baseURL - The base URL of the receiver. If the receiver is an absolute URL, returns nil.

1812 * host - The host of the URL.

1813 * parameterString - The parameter string of the URL.

1814 * password - The password of the URL (i.e. http://user:pass@www.test.com would return pass)

1815 * path - Returns the path of a URL.

1816 * port - The port number of the URL.

1817 * query - The query string of the URL.

1818 * relativePath - The relative path of the URL without resolving against the base URL. If the receiver is an absolute URL, this method returns the same value as path.

1819 * relativeString - string representation of the relative portion of the URL. If the receiver is an absolute URL this method returns the same value as absoluteString.

1820 * scheme - The resource specifier of the URL (i.e. http, https, file, ftp, etc).

1821 * user - The user portion of the URL.

1822 

1823 Then the third line simply logs the URL to the console, so you will new to open up the console while you run this in the simulator to see the results.

1824 

1825 Finally the forth line returns YES, this will allow the UIWebView to follow the link, if you would just like to catch a link and stop the UIWebView from following it then simply return NO.

1826 

1827 UIBUtton title image 不能同时显示

1828 

1829 [ leftbutton setTitle:_(@"About") forState:UIControlStateNormal ];

1830 

1831 

1832 [ leftbutton setImage:image forState:UIControlStateNormal ];

1833 

1834 不能同时显示。

1835 

1836 其他控件如：UINavigatonItem

1837 

1838 不要在语言包里面设置空格

1839 有时，为了界面的需要，我们不要在语言包里面加空格，要在程序中进行控制。

1840 buttonTitle = [ NSString stringWithFormat:@" %@", _(@"updateWeb") ];

1841 

1842 NSNotificationCenter 带参数发送

1843 

1844 MPMoviePlayerController* theMovie = [[MPMoviePlayerController alloc]initWithContentURL:[NSURL fileURLWithPath:[[[tableTitles objectForKey:keyIndex] objectAtIndex:row] objectAtIndex:3] ]];

1845 

1846 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(myMovieFinishedCallback:) name:MPMoviePlayerPlaybackDidFinishNotification object:theMovie];

1847 

1848 [theMovie play];

1849 

1850 -(void)myMovieFinishedCallback:(NSNotification*)aNotification

1851 

1852 {

1853 

1854 MPMoviePlayerController *theMovie = [aNotification object];

1855 

1856 [[NSNotificationCenter defaultCenter] removeObserver:self name:MPMoviePlayerPlaybackDidFinishNotification object:theMovie];

1857 

1858 // Release the movie instance [theMovie release];

1859 

1860 }

1861 

1862 －－－－－－－－－－－－

1863 

1864 MPMoviePlayerController* theMovie = [[MPMoviePlayerController alloc]initWithContentURL:[NSURL fileURLWithPath:[[[tableTitles objectForKey:keyIndex] objectAtIndex:row] objectAtIndex:3] ]];

1865 

1866 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(myMovieFinishedCallback:) name:MPMoviePlayerPlaybackDidFinishNotification object:theMovie userInfo:dic];

1867 

1868 [theMovie play];

1869 

1870 -(void)myMovieFinishedCallback:(NSNotification*)aNotification

1871 

1872 {

1873 

1874 MPMoviePlayerController *theMovie = [aNotification object];

1875 

1876 [[NSNotificationCenter defaultCenter] removeObserver:self name:MPMoviePlayerPlaybackDidFinishNotification object:theMovie];

1877 

1878 // Release the movie instance [theMovie release];

1879 

1880 }

1881 

1882 延时一段时间执行某一函数

1883 

1884 [self performSelector:@selector(dismissModal) withObject:self afterDelay:1.0];

1885 

1886 无99美金证书联机开发

1887 第一步:进入 cd /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.1.sdk/ sudo vi SDKSettings.plist,将CODE_SIGNING_REQUIRED的值改成NO. 保存后退出.

1888 

1889 第二步:重新启动XCode项目.

1890 

1891 第三步:右击项目GetInfo.将Code Signing下的Code Signing Identity值设置成Dont Code Sign, 将Code Signing Identity下的Any iOS Device的值设置成空.

1892 

1893 获取IOS设备的基本信息

1894 系统唯一标识 

1895 是什么设备：iPad还是iPhone等 

1896 iOS版本号 

1897 系统名称 

1898 

1899 [[UIDevice currentDevice] uniqueIdentifier], 

1900 [[UIDevice currentDevice] localizedModel], 

1901 [[UIDevice currentDevice] systemVersion], 

1902 [[UIDevice currentDevice] systemName], 

1903 [[UIDevice currentDevice] model]];

1904 

1905 用NSDateFormatter调整时间格式的代码

1906 

1907 在开发iOS程序时，有时候需要将时间格式调整成自己希望的格式，这个时候我们可以用NSDateFormatter类来处理。

1908 例如：

1909 

1910 //实例化一个NSDateFormatter对象

1911 

1912 NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

1913 

1914 //设定时间格式,这里可以设置成自己需要的格式

1915 

1916 [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

1917 

1918 //用[NSDate date]可以获取系统当前时间

1919 

1920 NSString *currentDateStr = [dateFormatter stringFromDate:[NSDate date]];

1921 

1922 //输出格式为：2010-10-27 10:22:13

1923 

1924 NSLog(@”%@”,currentDateStr);

1925 

1926 //alloc后对不使用的对象别忘了release

1927 

1928 [dateFormatter release];

1929 

1930 UIView设置成圆角方法

1931 

1932 m_mainImgView.layer.cornerRadius = 6;

1933 m_mainImgView.layer.masksToBounds = YES;

1934 

1935 iPhone里的frame和bounds区别

1936 

1937 

1938 

1939 Objective-C内存管理

1940 

1941 在使用Objective-C的工作中内存管理是首先要学会的一项技能，是如此重要，就好比是男人就要追漂亮姑娘一样～～下面就来聊聊Apple官网上的内存管理的事情。

1942 

1943 Objective-C的对象内存管理是一件非常有意思的事情，由其是在iPhone嵌入式设备中．

1944 

1945 想玩的省心点，就得熟知它的管理规则，由其是内存的管理机制。了解它的品性了才能在Cocoa的世界里如鱼得水。否则，反之（如水得鱼！！^_^）。

1946 

1947 首先，要牢记Apple的官网上的内存管理三定律：

1948 

1949 1，一个对象可以有一个或多个拥有者

1950 

1951 2，当它一个拥有都都没有时，它就会被回收

1952 

1953 3，如果想保留一个对象不被回收，你就必需成为它的拥有者

1954 

1955 

1956 所有内存管理的原则全在这里！！

1957 

1958 简单？？哈哈!

1959 

1960 名人曰：“大道至简”

1961 

1962 这儿玩意儿说起来比过家家还容易，但其实有些事情真正做起来并不是简单的事儿~~

1963 

1964 咱们首先来说怎么样才能成为一个对象的拥有者。Cocoa提供了一个机制叫"reference counting"，翻译过来就是“关联记数器”（自己翻译的，真不知叫啥，如果有官方的翻译请通知我）。每一个对象都有一个关联记数的值。当它被创建时，它的值为“1”。当值减少到“0”时，就会被回收(调用它的deallocate方法，如果没有写，则调用从NSObject继承而来的回收方法，下文有说，一定要重写该方法)。以下几个方法可以操作这个记数：

1965 

1966 1，alloc

1967 为对象分配内存，记数设为“1”，并返回此对象。

1968 

1969 2，copy

1970 复制一个对象，此对象记数为“1”，返回此对象。你将成为此克隆对象的拥有者

1971 

1972 3，retain

1973 对象“关联记数”加“1”，并成为此对象的拥有者。

1974 

1975 4，release

1976 对象“关联记数”减“1”，并丢掉此对象。

1977 

1978 5，autorelease

1979 

1980 在未来的某一时刻，对象“关联记数”减“1”。并在未来的某个时间放弃此对象。

1981 

1982 有了上面的几个方法（当然这也是所有的内存操作的方法，简单吧，哈哈哈）你就可以随意操作一个对象的记数。并部分或完全的控制它的生命周期。但实际应用中，随意乱写上面的任何一个方法都可能会带来严重的内存泄露。混乱的内存分配等于没完没了的麻烦工作，你不想在情人节的日子还在为记数之类的鸟问题而丢了老婆吧~~哈哈哈，为了美丽温柔贤惠又善解人意的准老婆请牢记以下四条：

1983 

1984 1，一个代码块内要确保copy, alloc 和 retain 的使用数量与 release 和 autorelease 的数量。

1985 

1986 2，在使用以“alloc”或“new”开头或包含“copy”的方法，或“retain”一个对象时，你就会变为它的拥有者。

1987 

1988 3，实现“dealloc”方法，并施放所有的实例变量。（其实这里还有很多的巧儿门！！）

1989 

1990 4，永不自己调用“dealloc”方法，这是系统当“retain”减到“0”时，自动调用的。手动调用会引起retain count记数错误（多一次的release）。

1991 

1992 其实做到这些也不难，

1993 

1994 retain count 增加与减少的方法对应，板丁板做到了就行了。

1995 

1996 来自：http://blog.csdn.net/dboylx/archive/2009/02/13/3888746.aspx

1997 

1998 iphone更改键盘右下角按键的type

1999 

2000 以UISearchBar为例。

2001 

2002 

2003 创建mySearchBar:

2004 

2005 mySearchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0.0, 0,320, SEARCH_HEIGHT)];

2006 mySearchBar.placeholder = curPath;

2007 [mySearchBar setDelegate:self];

2008 //tableView.tableHeaderView =mySearchBar;

2009 [self.view addSubview:mySearchBar];

2010 

2011 

2012 更改按键的keyType(默认是return,这里将它更改成done，当然还可以更改成其他的):

2013 UITextField *searchField = [[mySearchBar subviews] lastObject];

2014 [searchField setReturnKeyType:UIReturnKeyDone];

2015 [mySearchBar release];

[ios开发]-APP-上架流程 由于苹果的机制，在非越狱机器上安装必须通过官方的Appstore， 开发者开发好应用后上传Appstore，也需要通过审核等环节。 AppCan作为一个跨主流平台的一个开发平台，也对ipa包上传Appstore作了支持。 本文从三个流程来介绍如何实现AppCan在 线编译出ipa包，以及上传到苹果Appstore。
蓬莱仙羽 麦子学院讲师，游戏蛮牛专栏作家，CSDN博客专家，热爱游戏开发，热爱Coding!