👀 Views: 64 💬 Answers: 1 📅 Created: 2025-06-05

ios uicollectionview swift uicollectionviewlayout

I'm working with a question with my UICollectionView that uses a custom UICollectionViewLayout. In iOS 16, when I scroll through the collection view, some items are getting misaligned and not respecting the custom size settings I defined. I have overridden the `layoutAttributesForElements(in:)` method to return custom attributes based on my logic, but it seems that iOS 16 is not applying them correctly. Here's a simplified version of my layout code: ```swift class CustomFlowLayout: UICollectionViewFlowLayout { override func layoutAttributesForElements(in rect: CGRect) -> [UICollectionViewLayoutAttributes]? { let attributes = super.layoutAttributesForElements(in: rect) attributes?.forEach { attribute in if attribute.representedElementCategory == .cell { // Custom sizing logic if let indexPath = attribute.indexPath as IndexPath?, indexPath.item % 2 == 0 { attribute.frame.size = CGSize(width: 100, height: 200) } else { attribute.frame.size = CGSize(width: 50, height: 100) } } } return attributes } } ``` When testing this layout, I noticed that items aren't getting sized correctly, especially after scrolling back to the top. I get some unusual console logs: `UICollectionView is attempting to perform a batch update while an existing update is still in progress.` I’ve tried invalidating the layout in `viewWillAppear` and also when new data is loaded, but the scenario continues. Could this be a bug in iOS 16 or am I missing a configuration step? Any insights on how to manage this effectively would be greatly appreciated.