UIPickerView基本用法

 

#import "ViewController.h"

 

 

#import <UIKit/UIKit.h>

 

@interface ViewController : UIViewController<UIPickerViewDelegate,UIPickerViewDataSource>

{

    UILabel *lable;

    NSArray *array;

}

 

@end

@interface ViewController ()

 

@end

 

@implementation ViewController

 

- (void)viewDidLoad {

    [super viewDidLoad];

    array=[NSArray arrayWithObjects:@"0",@"1",@"2",@"3" ,@"4",@"5",@"6",@"7",@"8",@"9",@"10",@"11",nil];

    

    

    UIButton *button3=[UIButton buttonWithType:UIButtonTypeCustom];

    button3.backgroundColor=[UIColor greenColor];

    button3.frame=CGRectMake(100, 300, 120, 50);

    [button3 addTarget:self action:@selector(showMyPickerView:) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:button3];

 }

-(void)showMyPickerView:(UIButton *)sender

{

    //UIPickerView选择器的功能

    UIView *whiteView=[[UIView alloc]initWithFrame:self.view.frame];

    //添加视图进行遮挡

    whiteView.tag=150;

    whiteView.backgroundColor=[UIColor whiteColor];

    [self.view addSubview:whiteView];

    

    //UIPickerView选择器的功能，实现数据的选择

    UIPickerView *pickerView1=[[UIPickerView alloc]initWithFrame:CGRectMake(0, 0, 280, 300)];

    pickerView1.center=whiteView.center;

    pickerView1.delegate=self;

    pickerView1.dataSource=self;

    [whiteView addSubview:pickerView1];

    

    UIButton *button0=[UIButton buttonWithType:UIButtonTypeCustom];

    button0.frame=CGRectMake(0, 0, 80, 60);

    button0.backgroundColor=[UIColor greenColor];

    [button0 setTitle:@"close" forState:UIControlStateNormal];

    [button0 addTarget:self action:@selector(closePickerView:) forControlEvents:UIControlEventTouchUpInside];

    [whiteView addSubview:button0];

    lable=[[UILabel alloc]initWithFrame:CGRectMake(100,20, 200, 40)];

    lable.backgroundColor=[UIColor yellowColor];

    lable.tag=160;

    [whiteView addSubview:lable];

    

    

    

    

}

-(void)closePickerView:(UIButton *)sender

{

    UIView *removeView=[self.view viewWithTag:150];

    [removeView removeFromSuperview];//移除白色遮挡视图

}

//返回选择器的列数

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView

{

    return 2;

}

//返回当前显示的行数

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component

{

    

    return array.count;

}

//显示数组中的数字在对应的行中

-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{

    return  [array objectAtIndex:row];

}

//获取单元行的内容

-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{

    NSString *str1=[array objectAtIndex:row];

    NSString *string1=[self  pickerView:pickerView titleForRow:row forComponent:0];

    UILabel *getlable=(UILabel *)[self.view viewWithTag:160];

    NSLog(@"%@---%@",str1,string1);

    getlable.text=string1;

}