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Core Data Fetch Request implementation guide on iOS 17 with CloudKit Sync - Need guide

👀 Views: 244 💬 Answers: 1 📅 Created: 2025-06-16
ios core-data cloudkit swift uikit

Could someone explain Quick question that's been bugging me - I tried several approaches but none seem to work. I'm experiencing an scenario where my Core Data fetch request does not seem to update in real-time after syncing with CloudKit in my iOS 17 app. I am using NSPersistentCloudKitContainer and have configured my Core Data model to utilize CloudKit syncing. While the initial data fetch works fine, subsequent updates from CloudKit do not reflect in my app unless I manually trigger a fetch. I have set up my fetch request like this: ```swift let fetchRequest: NSFetchRequest<MyEntity> = MyEntity.fetchRequest() fetchRequest.sortDescriptors = [NSSortDescriptor(key: "createdAt", ascending: false)] ``` I use this fetch request in a `NSFetchedResultsController` to populate a `UITableView`. The `NSFetchedResultsControllerDelegate` methods are implemented properly to handle changes, but I have noticed that when new data is added via CloudKit, the `fetchedResultsController(_:didChange:at:for:newIndexPath:)` delegate method is not being called. Additionally, I’ve made sure to set the `automaticallyMergesChangesFromParent` property to `true` on the `NSPersistentCloudKitContainer`. However, I still see the following log message intermittently: ``` behavior: CloudKit sync failed with behavior: (behavior Domain=CKErrorDomain Code=ServerError UserInfo={NSLocalizedDescription=The operation couldn’t be completed. (CKErrorDomain behavior 0.)}) ``` I have tried deleting the app and reinstalling it to reset the CloudKit container, checking the iCloud entitlements, and ensuring that my device is logged into the correct iCloud account. Is there something I might be missing that could be causing the fetch request to not update? Any advice on debugging this would be greatly appreciated! How would you solve this? Any ideas how to fix this?