iOS应用中网络等待Loading的实现方法详解手机开发

UIWebView加载Loading 两种方法

第一种方法：使用UIView and UIActivityIndicatorView

//创建UIWebView 

WebView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 44, 320, 400)]; 

[WebView setUserInteractionEnabled:NO]; 

[WebView setBackgroundColor:[UIColor clearColor]]; 

[WebView setDelegate:self]; 

[WebView setOpaque:NO];//使网页透明 

NSString *path = @"http://www.baidu.com"; 

NSURL *url = [NSURL URLWithString:path]; 

[WebView loadRequest:[NSURLRequest requestWithURL:url]]; 

//创建UIActivityIndicatorView背底半透明View 

UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)]; 

[view setTag:103]; 

[view setBackgroundColor:[UIColor blackColor]]; 

[view setAlpha:0.8]; 

[self.view addSubview:view]; 

activityIndicator = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 32.0f, 32.0f)]; 

[activityIndicator setCenter:view.center]; 

[activityIndicator setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleWhite]; 

[view addSubview:activityIndicator]; 

[self.view addSubview:WebView]; 

[view release]; 

[WebView release]; 

//开始加载数据 

- (void)webViewDidStartLoad:(UIWebView *)webView { 

 [activityIndicator startAnimating]; 

//数据加载完 

- (void)webViewDidFinishLoad:(UIWebView *)webView { 

 [activityIndicator stopAnimating]; 

 UIView *view = (UIView *)[self.view viewWithTag:103]; 

 [view removeFromSuperview]; 

  第二种方法：使用UIAlertView and UIActivityIndicatorView

/加载网页动画 

- (void)webViewDidStartLoad:(UIWebView *)webView{ 

 if (myAlert==nil){ 

 myAlert = [[UIAlertView alloc] initWithTitle:nil 

 message: @"读取中..." 

 delegate: self 

 cancelButtonTitle: nil 

 otherButtonTitles: nil]; 

 UIActivityIndicatorView *activityView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite]; 

 activityView.frame = CGRectMake(120.f, 48.0f, 38.0f, 38.0f); 

 [myAlert addSubview:activityView]; 

 [activityView startAnimating]; 

 [myAlert show]; 

- (void)webViewDidFinishLoad:(UIWebView *)webView{ 

 [myAlert dismissWithClickedButtonIndex:0 animated:YES]; 

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