ios - 当 UICollectionView 停止滚动时获取 Item(或索引)

Question

当 UICollectionView 停止滚动时，有什么简单的方法可以获取 Item 或 Item 的索引吗？

Answer 1

这就是我在 UICollectionView 停止滚动时找到页面中心可用项目的方式。 基于this Answer. https://stackoverflow.com/a/24396643/2618600

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    NSLog(@"Finished scrolling %@",scrollView);

    if ([scrollView isKindOfClass:[UICollectionView class]])
    {

        UICollectionView *mainCollection = (UICollectionView *) scrollView;


  CGRect visibleRect = (CGRect){.origin = mainCollection.contentOffset, .size = mainCollection.bounds.size};
        CGPoint visiblePoint = CGPointMake(CGRectGetMidX(visibleRect), CGRectGetMidY(visibleRect));
        NSIndexPath *visibleIndexPath = [mainCollection indexPathForItemAtPoint:visiblePoint];
        NSLog(@"visibleIndexPath %ld",(long)visibleIndexPath.row);

}