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Replied In UICollectionViewDiffableDataSource crashing in Catalyst

I solved it: Use this function func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChangeContentWith snapshot: NSDiffableDataSourceSnapshot<String,NSManagedObjectID>) instead of func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChangeContentWith snapshot: NSDiffableDataSourceSnapshotReference)

Replied In UICollectionViewDiffableDataSource reorderingHandlers not working

I found the way to solve it. Just implement empty UICollectionViewDragDelegate & UICollectionViewDropDelegate methods. extension ReorderableCollectionViewController: UICollectionViewDragDelegate { func collectionView(_ collectionView: UICollectionView, itemsForBeginning session: UIDragSession, at indexPath: IndexPath) -> [UIDragItem] { return [] } } extension ReorderableCollectionViewController: UICollectionViewDropDelegate { func collectionView(_ collectionView: UICollectionView, performDropWith coordinator: UICollectionViewDropCoordinator) { } }