键盘事件

- (void)buildNotification {
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShowWithNotification:) name:UIKeyboardWillShowNotification object:nil];
    
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHideWithNotification:) name:UIKeyboardWillHideNotification object:nil];
 }

- (void)keyboardWillShowWithNotification:(NSNotification *)notification {
    CGRect rect = [notification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
    CGFloat height = rect.size.height - (kDevice_iPhoneX ? kFloatBottomDangerHeight : 0);

    [UIView animateWithDuration:[notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue] animations:^{
        _inputTextView.transform = CGAffineTransformMakeTranslation(0, - height);
    }];
}

- (void)keyboardWillHideWithNotification:(NSNotification *)notification {
    [UIView animateWithDuration:[notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue] animations:^{
        _inputTextView.transform = CGAffineTransformIdentity;
    }];
}