print?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   {       //獲取鍵盤的高度        NSDictionary *userInfo = [aNotification userInfo];       NSValue *aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];       CGRect keyboardRect = [aValue CGRectValue];       int height = keyboardRect.size.width;   }     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 {     //獲取鍵盤的高度 NSDictionary *userInfo = [aNotification userInfo];     NSValue *aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];     CGRect keyboardRect = [aValue CGRectValue];     int height = keyboardRect.size.width; }