Question

有没有办法检查我的tableview刚完成滚动？ table.isDragging和table.isDecelerating是我能找到的唯一两种方法。我不确定在tableview完成滚动时如何预测或得到通知。

如果tableView正在滚动，我可以以某种方式使用计时器来检查每一秒吗？

Answer 1

您将按如下方式实施UIScrollViewDelegate协议方法：

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

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
    [self scrollingFinish];
}

- (void)scrollingFinish {
    //enter code here
}

Swift版

public func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
    if decelerate {
        scrollingFinished()
    }
}

public func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
    scrollingFinished()
}

func scrollingFinished() {
    print("scrolling finished...")
}

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

第二个用于缓慢滚动，甚至在手指触摸时滚动停止，正如Apple Documents所说，when the scrolling movement comes to a halt。

Answer 2

每次用户滚动停止时，以下代码都会更新。

- (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 3

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

Answer 4

在使用shanegao's answer和Jovan Stankovic的评论之后，我为Swift3设计了这个 -

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
    }
}

如何检查UITableView何时完成滚动

4 个答案: