Issues with UICollectionView and Core Data Fetch Results in iOS 17
I've looked through the documentation and I'm still confused about I'm encountering a frustrating issue where my UICollectionView does not update its content after fetching data from Core Data in my iOS 17 app. I've set up a NSFetchedResultsController to monitor changes, but the collection view remains empty after performing a fetch, even though I've confirmed that records exist in Core Data. I've implemented the delegate methods to respond to changes, but nothing seems to trigger a reload of the collection view. Here’s the relevant code snippet: ```swift class MyCollectionViewController: UICollectionViewController, NSFetchedResultsControllerDelegate { var fetchedResultsController: NSFetchedResultsController<MyEntity>! override func viewDidLoad() { super.viewDidLoad() setupFetchedResultsController() } func setupFetchedResultsController() { let fetchRequest: NSFetchRequest<MyEntity> = MyEntity.fetchRequest() fetchRequest.sortDescriptors = [NSSortDescriptor(key: "date", ascending: true)] fetchedResultsController = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: persistentContainer.viewContext, sectionNameKeyPath: nil, cacheName: nil) fetchedResultsController.delegate = self do { try fetchedResultsController.performFetch() } catch { print("Error fetching data: \(error.localizedDescription)") } } func controllerDidChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) { collectionView.reloadData() } } ``` I've confirmed that `controllerDidChangeContent` is being called, but `collectionView.reloadData()` doesn't seem to be updating the displayed items. I’ve also checked that the data source methods like `collectionView(_:numberOfItemsInSection:)` and `collectionView(_:cellForItemAt:)` are correctly implemented. When I print the count of `fetchedResultsController.fetchedObjects` in `controllerDidChangeContent`, it returns the expected number of objects, but the collection view still shows no items. I have tried calling `collectionView.reloadSections(IndexSet(integer: 0))` instead of `reloadData()`, but that didn’t help either. Any suggestions on how to resolve this issue? I'm coming from a different tech stack and learning Swift. Has anyone dealt with something similar?