鍵盤高度

//當鍵盤出現或改變時調用

- (void)keyboardWillShow:(NSNotification *)aNotification

{

    //擷取鍵盤的高度

NSDictionary *userInfo =

[aNotification userInfo];

    NSValue

*aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];

CGRect keyboardRect = [aValue

CGRectValue];

self.keyboardHeight

= keyboardRect.size.height;

}