如何检查当UITableView完成滚动

Question

有没有办法检查我的tableview是否刚刚完成滚动？ table.isDragging和table.isDecelerating是我能找到的唯一两种方法。我不确定我在桌面视图滚动完成时如何预测或得到通知。

我可以以某种方式使用计时器检查每一秒如果tableView滚动或不？

Answer 1

UITableView符合UIScrollViewDelegate。请参阅该协议的文档，它有你需要的方法。

Answer 2

你会实现UIScrollViewDelegate协议方法如下：

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate 
{ 
    if (!decelerate) { 
     [self scrollingFinish]; 
    } 
} 
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView 
{ 
    [self scrollingFinish]; 
} 
- (void)scrollingFinish { 
    //enter code here 
} 

对于上述委托方法The scroll view sends this message when the user’s finger touches up after dragging content. The decelerating property of UIScrollView controls deceleration.当视图减速停止，参数decelerate将NO。

第二个用于缓慢滚动，甚至在您的手指触摸时滚动停止，如Apple Documents所述，when the scrolling movement comes to a halt。

Answer 3

下面的代码会在用户每次停止滚动时更新。

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate 
{ 
    if (!decelerate) 
    { 
     if (isScrollingStart) 
     { 
      isScrollingStart=NO; 
      [self scrollingStopped]; 
     } 
    } 
} 
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView 
{ 

    if (isScrollingStart) 
    { 
     isScrollingStart=NO; 
     [self scrollingStopped]; 
    } 
} 
- (void)scrollViewDidScroll:(UIScrollView *)scrollView 
{ 
    isScrollingStart=YES; 
} 
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView 
{ 
    isScrollingStart=YES; 
} 
-(void)scrollingStopped 
{ 
    NSLog(@"Scrolling stopped"); 
} 

Answer 4

使用shanegao's answer和它的Jovan斯坦科维奇的评论后，我设计了这个Swift3 -

extension NMViewController: UIScrollViewDelegate { 
    func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) { 
     if !decelerate { 
      scrollViewDidEndDecelerating(scrollView) 
     } 
    } 

    func scrollViewDidScrollToTop(_ scrollView: UIScrollView) { 
     scrollViewDidEndDecelerating(scrollView) 
    } 

    func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) { 
     // Your logic to handle after scrolling is done 
    } 
}