如何检查UITableView何时完成滚动

Question

有没有办法检查我的tableview刚完成滚动？table.isDragging并且table.isDecelerating是我能找到的唯一两种方法.当tableview完成滚动时,我不确定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
}

Swift版本

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.

Apple Document说,第二个用于缓慢滚动,甚至在手指触摸时滚动停止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。