- (void)regNotification{    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChangeFrame:) name:UIKeyboardWillChangeFrameNotification object:nil];}- (void)unregNotification{    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillChangeFrameNotification object:nil];}#pragma mark - notification handler- (void)keyboardWillChangeFrame:(NSNotification *)notification{    NSDictionary *info = [notification userInfo];    CGFloat duration = [[info objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue];    CGRect beginKeyboardRect = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue];    CGRect endKeyboardRect = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];        CGFloat yOffset = endKeyboardRect.origin.y - beginKeyboardRect.origin.y;        CGRect inputFieldRect = self.inputTextField.frame;    CGRect moreBtnRect = self.moreInputTypeBtn.frame;        inputFieldRect.origin.y += yOffset;    moreBtnRect.origin.y += yOffset;        [UIView animateWithDuration:duration animations:^{        self.inputTextField.frame = inputFieldRect;        self.moreInputTypeBtn.frame = moreBtnRect;    }];}