UIDatePicker的简单用法

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// 初始化UIDatePicker
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UIDatePicker *datePicker = [[UIDatePicker alloc] initWithFrame:CGRectMake(0, 200, 320, 216)];
// 设置时区
[datePicker setTimeZone:[NSTimeZone timeZoneWithName:@"GMT"]];
// 设置当前显示时间
[datePicker setDate:tempDate animated:YES];
// 设置显示最大时间（此处为当前时间）
[datePicker setMaximumDate:[NSDate date]];
// 设置UIDatePicker的显示模式
[datePicker setDatePickerMode:UIDatePickerModeDate];
// 当值发生改变的时候调用的方法
[datePicker addTarget:self action:@selector(datePickerValueChanged:) forControlEvents:UIControlEventValueChanged];
[self.view addSubview:datePicker];
[datePicker release];

// 获得当前UIPickerDate所在的时间
NSDate *selected = [datePicker date];

    NSDate *select = [datePicker date];
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm"];
    NSString *dateAndTime =  [dateFormatter stringFromDate:select];
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"时间提示" message:dateAndTime delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
    [alert show];