iOS成長之路-擷取系統鍵盤的高度

NSNotificationCenter *defaultCenter = [NSNotificationCenter defaultCenter];    //UIKeyboardWillShowNotification鍵盤出現    [defaultCenter addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];    //UIKeyboardWillHideNotification 鍵盤隱藏    [defaultCenter addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];- (void)keyboardWillShow:(NSNotification *)aNotification{    //擷取鍵盤的高度NSDictionary *userInfo = [aNotification userInfo];    NSValue *aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];    CGRect keyboardRect = [aValue CGRectValue];    int height = keyboardRect.size.width;}