#pragma mark - keyboard events -

///键盘显示事件

- (void) keyboardWillShow:(NSNotification *)notification {

    //获取键盘高度，在不同设备上，以及中英文下是不同的

    CGFloat kbHeight = [[notification.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size.height;

    //计算出键盘顶端到inputTextView panel底端的距离(加上自定义的缓冲距离INTERVAL_KEYBOARD)

    CGFloat offset = (panelInputTextView.frame.origin.y+panelInputTextView.frame.size.height+INTERVAL_KEYBOARD) - (self.view.frame.size.height - kbHeight);

    // 取得键盘的动画时间，这样可以在视图上移的时候更连贯

    double duration = [[notification.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];

    //将视图上移计算好的偏移

    if(offset > ) {

        [UIView animateWithDuration:duration animations:^{

            self.view.frame = CGRectMake(0.0f, -offset, self.view.frame.size.width, self.view.frame.size.height);

        }];

    }

}

///键盘消失事件

- (void) keyboardWillHide:(NSNotification *)notify {

    // 键盘动画时间

    double duration = [[notify.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];

    //视图下沉恢复原状

    [UIView animateWithDuration:duration animations:^{

        self.view.frame = CGRectMake(, , self.view.frame.size.width, self.view.frame.size.height);

    }];

}