UIKit 框架之UIPickerView

// Created by City--Online on 15/5/18. // Copyright (c) 2015年 XQB. All rights reserved. #import "ViewController.h" @interface ViewController () UIPickerViewDataSource,UIPickerViewDelegate @property(nonatomic,strong) UIPickerView *pickerView; @property(nonatomic,strong) NSMutableArray *provinceArr; @property(nonatomic,strong) NSMutableArray *cityArr; //省份对应下的城市及显示的城市 @property(nonatomic,strong) NSDictionary *dicData; @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; _pickerView=[[UIPickerView alloc]init]; CGSize size=[UIScreen mainScreen].bounds.size; _pickerView.frame=CGRectMake(10, 10, size.width, 100); _pickerView.showsSelectionIndicator=YES; _pickerView.dataSource=self; _pickerView.delegate=self; [self.view addSubview:_pickerView]; _provinceArr=[[NSMutableArray alloc]initWithObjects:@"河南",@"广东", nil]; NSArray *arr1=[[NSArray alloc]initWithObjects:@"----",@"驻马店",@"周口",nil]; NSArray *arr2=[[NSArray alloc]initWithObjects:@"----",@"深圳",@"广州",@"东莞", nil]; _dicData=[[NSDictionary alloc]initWithObjects:[[NSArray alloc] initWithObjects:arr1,arr2, nil] forKeys:_provinceArr]; //找到第一个轮子选择行的索引 NSInteger selectProvinceIndex=[_pickerView selectedRowInComponent:0]; //根据索引找到对应的省份 NSString *province=[[_dicData allKeys]objectAtIndex:selectProvinceIndex]; //根据省份找到对应的城市 _cityArr=[[NSMutableArray alloc]init]; _cityArr=[_dicData objectForKey:province]; NSLog(@"%@",_dicData);
//行个数 - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component if (component==0) { return _provinceArr.count; else return _cityArr.count; //UIPickerViewDelegate //每列宽度 - (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component return _pickerView.frame.size.width/2; //每列中行的宽度 - (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component if (component==0) { return 50; return 30; //填充每行内容 //- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component // if (component==0) { // return [_provinceArr objectAtIndex:row]; // else{ // return [_cityArr objectAtIndex:row];
//为没行设置文本设置属性 - (NSAttributedString *)pickerView:(UIPickerView *)pickerView attributedTitleForRow:(NSInteger)row forComponent:(NSInteger)component NSString *str=[[NSString alloc]init]; if (component==0) { str=[_provinceArr objectAtIndex:row]; else{ str=[_cityArr objectAtIndex:row]; NSMutableAttributedString *attributedString=[[NSMutableAttributedString alloc]initWithString:str]; UIFont *font = [UIFont systemFontOfSize:10]; [attributedString addAttribute:NSFontAttributeName value:font range:NSMakeRange(0, str.length)]; [attributedString addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(0, str.length)]; return attributedString; //当picker view需要给指定的component.row指定view时,调用此函数.返回值为用作row内容的view 可以自定义View //- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view // UILabel *label=[[UILabel alloc]init]; // label.text=@"text"; // label.backgroundColor=[UIColor redColor]; // return label; //选中某一轮子的某一列 - (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component if (component==0) { NSString *selectProvince=[_provinceArr objectAtIndex:row]; _cityArr=[_dicData objectForKey:selectProvince]; //重新加载某一个轮子 [_pickerView reloadComponent:1]; //选中轮子的某一行 [_pickerView selectRow:0 inComponent:1 animated:YES]; else if (row==0) { return; NSInteger selectProvinceIndex=[_pickerView selectedRowInComponent:0]; NSString *province=[_provinceArr objectAtIndex:selectProvinceIndex]; NSString *city=[_cityArr objectAtIndex:row]; NSLog(@"%@-----%@",province,city); - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. @end

 

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