ios - Know if UICollectionView is scrolling

Question

Is there a way in iOS to know if a UICollectionView is scrolling or not?

I want to know it because I'm loading in every UICollectionCell an image downloaded from the Web, but if the Collection View is big and I scroll until the end it starts downloading every image and if I change view I must wait that previous download, this slow down the app and is not cool, lol :D

Thanks and sorry for my English ;)

Answer 1

正如上一篇文章提到的，UICollectionView继承自UIScrollView，所以我认为你可以检查几个UIScrollView方法：

 BOOL isScrolling = (cv.isDragging || cv.isDecelerating);

编辑：正如评论所提到的，API现在是：

BOOL isScrolling = (cv.dragging || cv.decelerating);

Answer 2

对于斯威夫特

let isScrolling: Bool = colView.isDragging || colView.isDecelerating

Answer 3

这可能会对您有所帮助，因为 UICollectionView 继承自 UIScrollView https://stackoverflow.com/a/19061527/2916429