Adding contentInset to the orthogonalScrollingBehavior section causes the penultimate cell to skip

Question

MikhailZimin OP

Created Nov ’20

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I did UICollectionViewCompositionalLayout with orthogonal section with groupPagingCentered as follow:

Code Block func neighborsRealitiesSection() -> NSCollectionLayoutSection {
  let itemSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1), heightDimension: .fractionalHeight(1))
  let item = NSCollectionLayoutItem(layoutSize: itemSize)
    
  let cellWidth = UIScreen.main.bounds.width / 3 + 1
  let groupSize = NSCollectionLayoutSize(widthDimension: .absolute(cellWidth), heightDimension: .absolute(cellWidth))
  let group = NSCollectionLayoutGroup.vertical(layoutSize: groupSize, subitems: [item])
    
  let section = NSCollectionLayoutSection(group: group)
  section.orthogonalScrollingBehavior = .groupPaging
    
  let inset = (UIScreen.main.bounds.width - cellWidth) / 2
  section.contentInsets = .init(top: 0, leading: inset, bottom: 0, trailing: inset)
    
  return section
}

If I adding the contentInsets to the section, collectionView won't stop scrolling on the penultimate cell. It will scrolling to the next cell. If I comment on contentInsets, it will be ok.

Why does it happen? Does anybody have this problem?

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Answer 1

semty OP

Jan ’21

Hi! I've been having the same problem for over a half a year now! It's very frustrating that everything was fine on iOS 14 and now we're having one more regression bug

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