UIPanGestureRecognizer 拖动TableView改变其高度

需求：项目中要求tableView的高度随着手拖动的位置而改变如下图：

关键代码如下：

- (void)viewDidLoad{

 panGestureRecognizer = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(toHandlePanAction:)];

    [self.searchResultView addGestureRecognizer: panGestureRecognizer];

}

- (void)toHandlePanAction:(UIPanGestureRecognizer *)sender {

    CGPoint point = [sender translationInView:self.view];

    CGRect frame = self.searchResultView.frame;

    frame.origin.y = frame.origin.y + point.y;

    frame.size.height = frame.size.height - point.y;

    

    self.searchResultView.frame = frame;

    [ sender setTranslation: CGPointMake(0, 0) inView: self.view ];

}

 //[sender translationInView:self.view] 返回的是距离上次拖动位置的x,y的偏差值

//[ sender setTranslation: CGPointMake(0, 0) inView: self.view ] 在拖动过程中会连续回调toHandlePanAction这个方法，

然后要重置上一次的拖动位置的偏移量为0，这样才能够连续拖动