UISB PICkerView

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
<
//普通协议代理，处理视图选取普通事件协议功能
UIPickerViewDelegate,
//数据代理协议 获取数据代理函数
UIPickerViewDataSource

>

@end

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    //创建选择视图对象
    //显示多数组和多个元素以供选择
    //日期 时间 日历
    //地区地址功能
    UIPickerView* pickview=[[UIPickerView alloc]init];
    pickview.frame=CGRectMake(10, 100, 300, 200);
    
    //设置普通代理为当前视图控制器
    pickview.delegate=self;
    //数据代理对象为当前视图控制器
    pickview.dataSource=self;
    
    [self.view addSubview:pickview];
    
}
// 返回3组
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    
    return 3;
}


// 每组10行
//P1 调用此协议的选择视图本身
//P2 缔结组元素个数
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component;

{
    return 10;
}

//显示元素内容

-(NSString*) pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    NSString* str = [NSString stringWithFormat:@"%dzu %dhang",component+1,row+1];
    
    return str;
}


//设置每行高度
-(CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component
{
    
    return 100;
}


@end