如何使用Apple iPhone SDK获得UIKeyboard尺寸 [英] How to get UIKeyboard size with Apple iPhone SDK

问题描述

有没有办法以编程方式获得UIKeyboard的大小。高度216.0f，景观高度162.0f。

Is there some way to get UIKeyboard size programatically. 216.0f height and 162.0f height in landscape.

以下似乎被贬低。有没有什么方法可以在3.0 iPhone OS SDK和4.0 iPhone OS SDK中都没有任何警告来执行此操作..

Following seem to be depricated. Is there some way that works without any warning in both 3.0 iPhone OS SDK and 4.0 iPhone OS SDK to do this..

CGSize keyBoardSize = [[[note userInfo] 
objectForKey:UIKeyboardBoundsUserInfoKey]CGRectValue].size;

谢谢，
Tharindu

Thanks, Tharindu

推荐答案

您可以使用 UIKeyboardFrameBeginUserInfoKey 和 UIKeyboardFrameEndUserInfoKey从 userInfo 字典中获取键盘大小而不是。

You can get the keyboard size from the userInfo dictionary using the UIKeyboardFrameBeginUserInfoKey and the UIKeyboardFrameEndUserInfoKey instead.

这两个键返回一个 NSValue 实例，其中包含 CGRect 用于保存键盘在显示/隐藏动画的起点和终点的位置和大小。

These two keys return a NSValue instance containing a CGRect that holds the position and size of the keyboard at both the start and end points of the keyboard's show/hide animation.

编辑：

为了澄清， userInfo 字典来自 NSNotification 实例。它传递给您向观察者注册的方法。例如，

To clarify, the userInfo dictionary comes from an NSNotification instance. It's passed to your method that you register with an observer. For example,

- (void)someMethodWhereYouSetUpYourObserver
{
    // This could be in an init method.
    [[NSNotificationCenter defaultCenter] addObserver:self 
                    selector:@selector(myNotificationMethod:) 
                    name:UIKeyboardDidShowNotification 
                    object:nil];
}

- (void)myNotificationMethod:(NSNotification*)notification
{
    NSDictionary* keyboardInfo = [notification userInfo];
    NSValue* keyboardFrameBegin = [keyboardInfo valueForKey:UIKeyboardFrameBeginUserInfoKey];
    CGRect keyboardFrameBeginRect = [keyboardFrameBegin CGRectValue];
}

编辑2：

另外，请不要忘记在 dealloc 方法中以观察者身份移除自己！这是为了避免通知中心在释放后通知您的对象时发生的崩溃。

Also, please don't forget to remove yourself as an observer in your dealloc method! This is to avoid a crash that would occur when the notification center tries to notify your object after its been freed.

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