怎样创建UIDatePicker实例

本文主要是介绍怎样创建UIDatePicker实例，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

1. 初始化UIDatePicker

UIDatePicker *datePicker = [[UIDatePicker alloc] initWithFrame:CGRectMake(0, 200, 320, 216)];

注：高度和宽度可以设定为0，比如：

UIDatePicker *datePicker = [[UIDatePicker alloc] initWithFrame:CGRectMake(0, 200, 0, 0)];

2. 设置时区

[datePicker setTimeZone:[NSTimeZone timeZoneWithName:@"GMT"]];

3. 设置当前显示时间

[datePicker setDate:tempDate animated:YES];

4. 设置显示最大时间（此处为当前时间）

[datePicker setMaximumDate:[NSDate date]];

或

datePicker.maximumDate = [NSDate date];

设置最小时间

NSDate* minDate = [[NSDate alloc]initWithString:@"1900-01-01 00:00:00 -0500"];
datePicker.minimumDate = minDate;
[minDate release];

5. 设置UIDatePicker的显示模式

[datePicker setDatePickerMode:UIDatePickerModeDate];

参数 UIDatePickerMode 有四种：

    UIDatePickerModeTime,           // Displays hour, minute, and optionally AM/PM designation depending on the locale setting (e.g. 6 | 53 | PM)
    UIDatePickerModeDate,           // Displays month, day, and year depending on the locale setting (e.g. November | 15 | 2007)
    UIDatePickerModeDateAndTime,    // Displays date, hour, minute, and optionally AM/PM designation depending on the locale setting (e.g. Wed Nov 15 | 6 | 53 | PM)
    UIDatePickerModeCountDownTimer  // Displays hour and minute (e.g. 1 | 53)

6. 当值发生改变的时候调用的方法

[datePicker addTarget:self action:@selector(datePickerValueChanged:) forControlEvents:UIControlEventValueChanged];

7. 加入到视图

[self.view addSubview:datePicker];

甚至还可以加入到 UIActionSheet 中

[actionSheet addSubview: datePicker];

8. 释放对象

[datePicker release];

9. 获得当前UIPickerDate所在的时间

NSDate *date = [datePicker date];

比如可以在 datePickerValueChanged 回调方法中

- (void)datePickerValueChanged:(id)sender {
    UIDatePicker *datePicker = sender;
    NSDate *date = [datePicker date];
    // TODO:
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