scrollViewDidScroll not called in a CollectionView with custom layout

Question

I want to load more data when the user reaches the end of my CollectionView. Unfortunately, scrollViewDidScroll is never called.

For my CollectionView, I use a custom layout and I think the problem could be at this:

    if let layout = exploreCollectionView.collectionViewLayout as? CustomLayout {
        layout.delegate = self
    }

My class:

class MainViewController: UIViewController, UIScrollViewDelegate { .....

I want to check if the function scrollViewDidScroll works:

    // Check if a user wants to load more data at the bottom
func scrollViewDidScroll(_ scrollView: UIScrollView) {
    print("scrolled")
}

How do I implement the scrollViewDidScroll in my CustomLayout?

Answer 1

scrollViewDidScroll is a UIScrollViewDelegate method. So you need to make self (MyViewController) a delegate of the collectionview:

exploreCollectionView.delegate = self

And then for instance in an extension:

extension MyViewController: UIScrollViewDelegate {
   func scrollViewDidScroll(_ scrollView: UIScrollView) {
      print("scrolled")
   }
}