UICollectionViewCompositionalLayout section.decorationItems crash in iOS 16

Question

Created May ’24

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Hi, I am using compositional layout on my UICollectionView. For my sections I have added a decorationItem which is a UICollectionReusableView.

Everything seems to work fine on all iOS versions, except iOS 16, where I'm getting an unexpected crash.

The Firebase Crashlytics report says as follows:

Fatal Exception: NSInternalInconsistencyException
Invalid parameter not satisfying: sectionIndex < self.solutionBookmarks.count

This happens right after I'm reloading my collectionView after fetching data from API.

Any help would be appreciated on this, since I can't seem to debug this issue whatsoever. Thanks

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Answer 1

Apple Staff OP

Apple

May ’24

That exception is raised when compositional layout is queried for layout attributes for an item at an index path that is invalid.

Please file a feedback report at feedbackassistant.apple.com and post the Feedback ID here. Attach the full crash report, and your code that configures your compositional layout. That will hopefully provide a little more insight into the problem for us.

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