Layout is asking for ARCollectionElementKindSectionStickyHeader??

[glm4]

Why the layout is asking for a reusable view for kind ARCollectionElementKindSectionStickyHeader if I never registered it to my collection or implemented the - (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForStickyHeaderInSection:(NSInteger)section; method?

[ashfurrow]

Hmm, it shouldn't be doing that. Can you provide some of the setup code, or a sample project that demonstrates the problem? More details about what's going on would definitely be helpful 👍

[glm4]

Using 2.2.0 version of the library.

here is my configuration:

Setup:

if let layout = ARCollectionViewMasonryLayout(direction: .vertical) {
       let margin = collection.frame.width * 0.04
      layout.contentInset = UIEdgeInsets(top: 20, left: 0, bottom: 20, right: 0)
      layout.itemMargins = CGSize(width: margin, height: margin)
      layout.dimensionLength = collection.frame.width / 2 - (margin * 2)
      collection.collectionViewLayout = layout
    }

  let headerNib = UINib(nibName: HeaderReusableView.reuseIdentifier, bundle: nil)
    collection.register(headerNib, forSupplementaryViewOfKind: UICollectionElementKindSectionHeader, withReuseIdentifier: HeaderReusableView.reuseIdentifier)

Then delegate methods:

func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
      guard let header = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: HeaderReusableView.reuseIdentifier, for: indexPath) as? HeaderReusableView else {
        return HeaderReusableView()
      }
      return header
  }

  func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {
    return CGSize(width: collectionView.frame.width, height: collectionView.frame.height * 0.15)
  }

If I leave it like that it crashed and it said that the view obtained for ARCollectionElementKindSectionStickyHeader was not obtained calling dequeue... .

I had to add:

collection.register(headerNib, forSupplementaryViewOfKind: ARCollectionElementKindSectionStickyHeader, withReuseIdentifier: HeaderReusableView.reuseIdentifier) to make it work but I think this shouldn't be needed right?

[ashfurrow]

Right, so when you return HeaderReusableView(), what needs to happen instead is to call this function which will create one for you. Try it out and let me know how it goes.

[glm4]

But that function needs a reuse identifier previously registered, which is what I don't want to do(Or should I even its not in the documentation).

[ashfurrow]

Sorry, I guess I'm confused. Can you describe the initial problem again?

[glm4]

The collectionView is calling the func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView delegate method. Which I think it is not good, since I never registered that kind or implemented the referenceSizeForStickyHeaderInSection method of the layout.

[ashfurrow]

Okay, thanks. I'm not sure what's going on. Have you implemented the standard, non-sticky header delegate function? There are two (source code).

To help me track down the problem and provide a solution, could you please create a sample project demonstrating the problem? Please provide as much detail as possible (what you expect, what happens instead, that kind of stuff).

[glm4]

Yes, I implemented the standard(collectionView:self.collectionView layout:self referenceSizeForHeaderInSection:indexPath.section) header(the one I need, I dont want the sticky ). I'll get back to you as soon as I can create the demo project. Thanks a lot.

[ashfurrow]

Okay, thanks!