UIDatePicker基本使用

UIDatePicker提供了一个快速选择日期和时间的控件，他是UIControl的子类，专门用于日期时间的选择。其样式能够经过UIDatePicker的属性进行灵活设置，同时也能够获取到当前UIDatePicker的值。UIDatePicker有几个方法和属性须要重点掌握。

 

@property (nonatomic) UIDatePickerMode datePickerMode; //设置UIDatePicker的展现样式，有四种样式

    UIDatePickerModeTime,           // 仅显示时间
    UIDatePickerModeDate,           // 显示年月日
    UIDatePickerModeDateAndTime,    // 显示年月日和时间
    UIDatePickerModeCountDownTimer  //倒计时

@property (nullable, nonatomic, strong) NSLocale   *locale;   //设置地区，地区的设置会影响日期以及时间文字的展现方式

@property (nullable, nonatomic, strong) NSTimeZone *timeZone; //设置时区

@property (nonatomic, strong) NSDate *date; //获取当前日期/时间值

 

- (void)setDate:(NSDate *)date animated:(BOOL)animated;//设置当前显示的日期时间

 

下面来看一个完整示例，选择时间后点击肯定按钮会弹出提示框，提示框内容为选择的时间

#import "ViewController.h"

@interface ViewController ()
@property(nonatomic,strong)UIDatePicker *datePicker;
@property(nonatomic,strong)UIButton *button;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self.view addSubview:self.datePicker];
    [self.view addSubview:self.button];
}

//懒加载
- (UIDatePicker *)datePicker{
    if (_datePicker == nil) {
        self.datePicker = [[UIDatePicker alloc]initWithFrame:CGRectMake(0, 280, self.view.frame.size.width, 200)];
        _datePicker.datePickerMode = UIDatePickerModeDateAndTime;
        _datePicker.locale = [[NSLocale alloc]initWithLocaleIdentifier:@"zh_CN"];
    }
    return _datePicker;
}

//懒加载按钮，用于展现datePicker选中的时间
- (UIButton *)button{
    if (_button == nil) {
        self.button = [[UIButton alloc]initWithFrame:CGRectMake((self.view.frame.size.width - 50) / 2.0, 100, 50, 30)];
        [_button setTitle:@"肯定" forState:UIControlStateNormal];
        _button.backgroundColor = [UIColor blueColor];
        [_button addTarget:self action:@selector(clickButton) forControlEvents:UIControlEventTouchUpInside];
    }
    return _button;
}

//肯定按钮被点击
- (void)clickButton{
    //获取用户经过UIDatePicker设置的时间
    NSDate *date = [self.datePicker date];
    
    //建立一个日期格式器
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
    //为日期格式器设置格式字符串
    [dateFormatter setDateFormat:@"yyyy年MM月dd日 HH:mm +0800"];
    //使用日期格式器格式化日期和时间
    NSString *dateString = [dateFormatter stringFromDate:date];
    NSString *message = [NSString stringWithFormat:@"您选择的日期和时间是：%@",dateString];
    
    //警告框
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"日期和时间" message:message preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *action = [UIAlertAction actionWithTitle:@"肯定" style:UIAlertActionStyleDefault handler:nil];
    
    [alert addAction:action];
    
    [self presentViewController:alert animated:YES completion:nil];
}

@end

运行截图：