[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];/**< 键盘将要出现的通知 */
    
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillDismiss:) name:UIKeyboardWillHideNotification object:nil];/**< 键盘将要消失的通知 */ 

#pragma mark - 键盘处理
//背景的单击手势
- (void)action_gesture:(id)sender {
    [self.view endEditing:YES];
}
- (void)keyboardWillShow:(NSNotification *)notification {
    
    [self.view addSubview:_keybordView];
    
    CGFloat curkeyBoardHeight = [[[notification userInfo] objectForKey:@"UIKeyboardBoundsUserInfoKey"] CGRectValue].size.height;
    CGRect begin = [[[notification userInfo] objectForKey:@"UIKeyboardFrameBeginUserInfoKey"] CGRectValue];
    CGRect end = [[[notification userInfo] objectForKey:@"UIKeyboardFrameEndUserInfoKey"] CGRectValue];
    UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];
    UIView *firstResponder = [[keyWindow performSelector:@selector(firstResponder)] superview];
    
    // 第三方键盘回调三次问题，监听仅执行最后一次
    if(begin.size.height>0 && (begin.origin.y-end.origin.y>0)){
        NSTimeInterval interal = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
        
        //计算 视图应该移动的位置,判断是否遮挡
        if (CGRectGetMaxY(firstResponder.frame) > (Screen_Height- curkeyBoardHeight)) {
            
            _offset = Screen_Height- curkeyBoardHeight - CGRectGetMaxY(firstResponder.frame)  ;
            [UIView animateWithDuration:interal animations:^{
                //移动视图
            }];
        }
    }
}
- (void)keyboardWillDismiss:(NSNotification *)notification {
    [_keybordView removeFromSuperview];
    
    NSTimeInterval interal = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    [UIView animateWithDuration:interal animations:^{
   //移动视图
    }];
    
}
- (void)dealloc
{
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
}