iphone - 在显示之前获取键盘的大小

Question

我想获取键盘的大小，我是这样操作的:

- (void)viewDidLoad
{
    ....

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:)  name:UIKeyboardWillShowNotification object:nil];

    ....
}

//I can get the size here
- (void)keyboardWillShow:(NSNotification *)notification 
{

    NSDictionary *userInfo = [notification userInfo];
    NSValue* aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];
    CGRect keyboardRect = [aValue CGRectValue];
}

但是现在，我想在显示键盘之前获取大小(在调用“keyboardWillShow”方法之前)。我该怎么做？

Answer 1

实际上 - (void)keyboardWillShow:(NSNotification *)notification; 方法在键盘显示之前被触发。