获取iPad屏幕键盘旋转后的大小

Question

对于我为 iPad 设计的应用程序，我有一个滚动视图，其中包含一些文本字段/文本视图。为了保持所有内容可见，我调整了滚动视图的 contentSize 属性，以在底部添加一个缓冲区，该缓冲区对应于键盘与滚动视图的重叠程度。这是代码（这里有一些特定于应用程序的内容，但希望不要太多，以至于您无法理解它）：

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];

    NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
    [nc addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    [nc addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}


- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];

    NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
    [nc removeObserver:self name:nil object:nil];
}

- (void)keyboardWillShow:(NSNotification *)aNotification
{
    NSValue *animationCurve = [[aNotification userInfo] valueForKey:UIKeyboardAnimationCurveUserInfoKey];
    UIViewAnimationCurve curve;
    [animationCurve getValue:&curve];

    NSValue *animationDuration = [[aNotification userInfo] valueForKey:UIKeyboardAnimationDurationUserInfoKey];
    NSTimeInterval duration;
    [animationDuration getValue:&duration];

    NSValue *endingFrame = [[aNotification userInfo] valueForKey:UIKeyboardFrameEndUserInfoKey];
    CGRect frame;
    [endingFrame getValue:&frame];

    [UIView beginAnimations:@"keyboardWillShow" context:bodyView];
    [UIView setAnimationCurve:curve];
    [UIView setAnimationDuration:duration]; 

    // Re-draw code here.

    [UIView commitAnimations];
}

- (void)keyboardWillHide:(NSNotification *)aNotification
{

    NSValue *animationCurve = [[aNotification userInfo] valueForKey:UIKeyboardAnimationCurveUserInfoKey];
    UIViewAnimationCurve curve;
    [animationCurve getValue:&curve];

    NSValue *animationDuration = [[aNotification userInfo] valueForKey:UIKeyboardAnimationDurationUserInfoKey];
    NSTimeInterval duration;
    [animationDuration getValue:&duration];

    [UIView beginAnimations:@"keyboardWillHide" context:bodyView];
    [UIView setAnimationCurve:curve];
    [UIView setAnimationDuration:duration];

    // Re-draw code here

    [UIView commitAnimations];      
}

我的问题是：在旋转期间我该如何处理键盘大小？当 iPad 旋转时，我没有收到任何键盘通知，但键盘的大小发生了显着变化。理想情况下，我只需根据横向模式下键盘重叠的数量来调整 contentSize 属性的高度，但如果不对键盘的高度进行硬编码，我看不出有什么好方法来做到这一点在两个方向上，我不想这样做。

Answer 1

我无意中发现了这个调试其他东西的答案。事实证明，当 iPad 从纵向旋转到横向时，纵向键盘会在横向键盘出现（并发送其通知）之前隐藏（并发送其通知）。因此，只要您考虑到这一点，就可以了。