8.4 UIDatePicker 时间选择器

#import "ViewController.h"

@interface ViewController ()
{
    UIDatePicker *_datePciker;
    UILabel *_label;
}
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    // 添加一个显示日期的文本框
    _label = [[UILabel alloc] initWithFrame:CGRectMake(0, 50, self.view.frame.size.width, 40)];
    _label.font = [UIFont systemFontOfSize:30];
    _label.textColor = [UIColor redColor];
    _label.textAlignment = NSTextAlignmentCenter;
    [self.view addSubview:_label];
    
    // 宽度（屏幕的宽度）和高度（219）定死的
    _datePciker = [[UIDatePicker alloc] initWithFrame:CGRectMake(0, 100, 0, 0)];
    [self.view addSubview:_datePciker];
    
    // 设置文字显示样式
    [self setDatePickerLocale];
    
    // 设置显示的内容
    [self setDatePickerContent];
    
    // 监听值得改变
    [_datePciker addTarget:self action:@selector(dataPickerChange:) forControlEvents:UIControlEventValueChanged];
    
    // 设置显示的时间和日期
    [self setDatePickerDate];
}

- (void)setDatePickerLocale
{
    NSLog(@"%@",[NSLocale availableLocaleIdentifiers]);
    
    // 1. 设置英文显示
//    [_datePciker setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"en_SC"]];
    
    // 2. 中文显示
    [_datePciker setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"zh_Hans_CN"]];
}

- (void)setDatePickerContent
{
//    UIDatePickerModeTime, 只显示时间
//    UIDatePickerModeDate, 只显示日期
//    UIDatePickerModeDateAndTime 同时显示时间和日期
//    UIDatePickerModeCountDownTimer, 倒计时
    
    [_datePciker setDatePickerMode:UIDatePickerModeDate];
    // 如果当前状态是倒计时状态 设置倒计时的时长(单位是 秒)
//    [_datePciker setCountDownDuration:600];
}

- (void)dataPickerChange:(UIDatePicker *)sender
{
    // 获取时间选择器的时间
    NSDate *date = sender.date;
    
    // 设置日期格式
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"yyyy-MM-dd hh:mm:ss"];
    _label.text = [dateFormatter stringFromDate:date];
}

- (void)setDatePickerDate
{
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"yyyy-MM-dd"];
    
    NSDate *date = [dateFormatter dateFromString:@"2080-12-20"];
    [_datePciker setDate:date];
}
@end

UIDatePicker 时间选择器.png