单击按钮时隐藏显示UIPicker

I want to do something like the keyboard show/hide so I want to set up picker as a first responder. Is this possible. If not how can i show/hide UIPicker in a view by a button click. On other topic how can i format the DatePicker output, now i get "2011-12-8 23:00 000000"

我想做一些像键盘显示/隐藏的东西,所以我想把选择器设置为第一响应者。这可能吗。如果不是如何通过按钮单击在视图中显示/隐藏UIPicker。关于其他主题我如何格式化DatePicker输出,现在我得到“2011-12-8 23:00 000000”

2 个解决方案

#1

You could have your UIPicker below your sceen (say, y = 480 for iPhone), and then when you tap your button move it to 480 - picker.frame.size.height so that it shows right above the bottom of your screen.

你可以将你的UIPicker放在你的下方(例如,iPhone的y = 480),然后当你点击按钮时将其移动到480 - picker.frame.size.height,使其显示在屏幕底部的正上方。

You can achieve the animated effect by using UIView animations as:

您可以使用UIView动画实现动画效果:

// Pre OS4 way

[UIView beginAnimations:@"animName" context:NULL];
[UIView setAnimationDuration:0.2];

CGRect f = picker.frame;

if (showingPicker) {
    f.origin.y = 480;
}
else {
    f.origin.y = 480 - picker.frame.size.height;
}

picker.frame = f;

[UIView commitAnimations];

// Post OS4 way - Block based

[UIView animateWithDuration:0.2 animations:^{

    if (showingPicker) {
        f.origin.y = 480;
    }
    else {
        f.origin.y = 480 - picker.frame.size.height;
    }

    picker.frame = f;

}

And for the DatePicker output you can use an NSDateFormatter. You can use predefined date and time styles or use setDateFormat:(NSString *)format to specify the format yourself.

对于DatePicker输出,您可以使用NSDateFormatter。您可以使用预定义的日期和时间样式,也可以使用setDateFormat:(NSString *)格式自行指定格式。

After that all you do is call your [formatter stringFromDate:datePicker.date];

之后你要做的就是调用[formatter stringFromDate:datePicker.date];

#2

You can find a complete source code how to use UIDataPicker here.

您可以在此处找到完整的源代码如何使用UIDataPicker。

#1