iOS UIScrollView UITableView UICollectionView判断滑动停止

继承UIScrollView的delegate，实现delegate里下面的两个方法

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
    if (!decelerate) {
        if (!scrollView.dragging && !scrollView.decelerating) {
            [self scrollViewDidEndScroll];
        }
        
    }
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
    if (!scrollView.dragging && !scrollView.decelerating) {
        [self scrollViewDidEndScroll];
    }
}

- (void)scrollViewDidEndScroll {
    NSLog(@"--already-stop---");
}