UICollectionView not calling scrollViewDidScroll - Swift

Question

I have imported UICollectionViewDelege, UICollectionViewDatasource and UIScrollViewDelegate.

I have set my collection views delegate and datasource to self.

But scrollViewDidScroll isnt being called, my scroll view goes horizontal if that makes a difference?

Why is scrollViewDidScroll not being called if collection views use the scrollview inside them?

Answer 1

I was moving form swift 2 to swift 3 and what did the trick is the following:

swift 2:

public func scrollViewDidScroll(scrollView: UIScrollView)

to swift 3:

public func scrollViewDidScroll(_ scrollView: UIScrollView)

So basically the "_" underscore did the trick. What is annoying is that swift compiler didn't complain about it!!!

As for inheritance UICollectionViewDelegate should do the trick.

Answer 2

I had to add information that my controller conforms to UIScrollViewDelegate protocol in order to make it work