IOS开发（4）之UIDatePicker控件

1 前言
UIDatePicker是一个十分类似于UIPickerView的类，十分常用，今天我们来学习一下。

2 UIDatePicker简介
上代码
日期选择：
.h文件：
[plain]
@property(nonatomic,strong) UIDatePicker *myDatePicker;

@property(nonatomic,strong) UIDatePicker *myDatePicker;
.m文件：
[plain]
@synthesize myDatePicker;

- (void)viewDidLoad
{
    //一年的秒数
    float oneYearTime = 60*60*24*365;
    NSLog(@"oneYearTime====>%f",oneYearTime);
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.view.backgroundColor = [UIColor whiteColor];
    //事件选择器
    self.myDatePicker = [[UIDatePicker alloc] init];
    self.myDatePicker.center = self.view.center;
    self.myDatePicker.datePickerMode=UIDatePickerModeDate;
    //添加事件
    [self.myDatePicker addTarget:self action:@selector(datePickerDateChanged:) forControlEvents:UIControlEventValueChanged];
    //获得当前时间
    NSDate *currentDate = self.myDatePicker.date;
    NSLog(@"Date = %@",currentDate);
    NSDate *oneYearFromToday = [currentDate dateByAddingTimeInterval:oneYearTime];
    NSDate *twoYearFromToday = [currentDate dateByAddingTimeInterval:2*oneYearTime];
    //最小可选时间
    self.myDatePicker.minimumDate = oneYearFromToday;
    self.myDatePicker.maximumDate = twoYearFromToday;
    [self.view addSubview:self.myDatePicker];
}

-(void) datePickerDateChanged:(UIDatePicker *)paramDatePicker{
    if ([paramDatePicker isEqual:self.myDatePicker]) {
        NSLog(@"Selected date=%@",paramDatePicker);
    }
}

@synthesize myDatePicker;

- (void)viewDidLoad
{
    //一年的秒数
    float oneYearTime = 60*60*24*365;
    NSLog(@"oneYearTime====>%f",oneYearTime);
    [super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
    self.view.backgroundColor = [UIColor whiteColor];
    //事件选择器
    self.myDatePicker = [[UIDatePicker alloc] init];
    self.myDatePicker.center = self.view.center;
    self.myDatePicker.datePickerMode=UIDatePickerModeDate;
    //添加事件
    [self.myDatePicker addTarget:self action:@selector(datePickerDateChanged:) forControlEvents:UIControlEventValueChanged];
    //获得当前时间
    NSDate *currentDate = self.myDatePicker.date;
    NSLog(@"Date = %@",currentDate);
    NSDate *oneYearFromToday = [currentDate dateByAddingTimeInterval:oneYearTime];
    NSDate *twoYearFromToday = [currentDate dateByAddingTimeInterval:2*oneYearTime];
    //最小可选时间
    self.myDatePicker.minimumDate = oneYearFromToday;
    self.myDatePicker.maximumDate = twoYearFromToday;
    [self.view addSubview:self.myDatePicker];
}

-(void) datePickerDateChanged:(UIDatePicker *)paramDatePicker{
    if ([paramDatePicker isEqual:self.myDatePicker]) {
        NSLog(@"Selected date=%@",paramDatePicker);
    }
}运行效果:

时间选择：
.m文件：
[plain]
(void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    self.view.backgroundColor = [UIColor whiteColor];
    //事件选择器
    self.myDatePicker = [[UIDatePicker alloc] init];
    self.myDatePicker.center = self.view.center;
    //设置成时间模式
    self.myDatePicker.datePickerMode=UIDatePickerModeCountDownTimer;
    [self.view addSubview:self.myDatePicker];
    NSTimeInterval twoMinutes = 2*60;
    [self.myDatePicker setCountDownDuration:twoMinutes];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    self.view.backgroundColor = [UIColor whiteColor];
    //事件选择器
    self.myDatePicker = [[UIDatePicker alloc] init];
    self.myDatePicker.center = self.view.center;
    //设置成时间模式
    self.myDatePicker.datePickerMode=UIDatePickerModeCountDownTimer;
    [self.view addSubview:self.myDatePicker];
    NSTimeInterval twoMinutes = 2*60;
    [self.myDatePicker setCountDownDuration:twoMinutes];
}UIDatePickerMode类型：
[plain]
-type enmu{
    UIDatePickerModeTime,//时间
    UIDatePickerModeDate,//日期
    UIDatePickerModeDateAndTime,//时间和日期
    UIDatePickerModeCountDownTimer//倒计时模式
}

-type enmu{
    UIDatePickerModeTime,//时间
    UIDatePickerModeDate,//日期
    UIDatePickerModeDateAndTime,//时间和日期
    UIDatePickerModeCountDownTimer//倒计时模式
}运行结果：

补充：移动开发 , IOS ,