UIDateicker并没有继承UIPickerView,它的宽度只有iphone的宽度，在ipad上直接显示出来非常不协调，所以苹果建议用UIPopoverViewController来显示，所以你可以在里面任意定制。

在iphone中显示需要手动配制动画，因为它只是一个视图。所以你有下面几种方式显示出一个UIDatePicker.

• 使用UIView动画块从底部慢慢滑动上来
• 嵌入到UIAlert或者UIActionSheet中
• 将UIDateicker视图做为可输入控件的定制键盘，inputView.
• 最后我的变态方案将两个UIDatePicker一起弹出，形成一个时间区域选择 

  •  1 NSLocale *locale = [[[NSLocale alloc] initWithLocaleIdentifier:@"am_ET"] autorelease];
     2
     3
     4     UIDatePicker *datePicker1 = [[[IoriDatePicker alloc] initWithFrame:CGRectMake(-80, 0, 0, 0)] autorelease];
     5     UIDatePicker *datePicker2 = [[[UIDatePicker alloc] initWithFrame:CGRectMake(-80, 0, 0, 0)] autorelease];
     6     CGRect frame = datePicker1.frame;
     7     frame.origin.y = -frame.size.height*0.1/2l;
     8     datePicker1.frame = frame;
     9     datePicker2.frame = frame;
    10     datePicker1.transform =  CGAffineTransformMakeScale (0.9, 0.9);
    11     datePicker2.transform =  CGAffineTransformMakeScale (0.9, 0.9);
    12
    13     NSTimeZone *timeZone = [[NSTimeZone alloc] initWithName:@"Antarctica/Vostok"];
    14     NSCalendar *calendar = [NSCalendar currentCalendar];
    15     calendar.locale = locale;
    16     calendar.timeZone = timeZone;
    17     datePicker1.calendar = calendar;
    18
    19     UIView *datePickerContaner = [[[UIView alloc] initWithFrame:CGRectMake(0, 30, 320, datePicker1.frame.size.height)] autorelease];
    20     UIView *datePickerView1 = [[[UIView alloc] initWithFrame:CGRectMake(0, 0, 160, datePickerContaner.frame.size.height)] autorelease];
    21     UIView *datePickerView2 = [[[UIView alloc] initWithFrame:CGRectMake(160, 0, 160, datePickerContaner.frame.size.height)] autorelease];
    22     datePickerView1.clipsToBounds = YES;
    23     datePickerView1.autoresizesSubviews = YES;
    24     datePickerView2.clipsToBounds = YES;
    25     datePickerView2.autoresizesSubviews = YES;
    26     datePickerView1.layer.borderWidth = 1;
    27     datePickerView1.layer.cornerRadius = 8;
    28     datePickerView2.layer.borderWidth = 1;
    29     datePickerView2.layer.cornerRadius = 8;
    30     [datePickerContaner addSubview:datePickerView1];
    31     [datePickerContaner addSubview:datePickerView2];
    32
    33
    34     datePicker1.datePickerMode = UIDatePickerModeTime;
    35     [datePickerView1 addSubview:datePicker1];
    36
    37
    38     datePicker2.datePickerMode = UIDatePickerModeTime;
    39     [datePickerView2 addSubview:datePicker2];