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

As the previous post mentions, UICollectionView inherits from UIScrollView, so I think you can just check a couple UIScrollView methods:

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

Edit: As the comment have mentioned, the API is now:

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

Answer 2

For Swift

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