Difficulty Implementing Swipe to Delete with Core Data in Objective-C - advanced patterns
I'm trying to implement a swipe-to-delete feature in my table view that is backed by Core Data. However, I'm running into an scenario where the item gets deleted from the UI but not from the persistent store, and sometimes it throws an behavior when I try to fetch the data again. I'm using iOS 15 and Xcode 13, and I want to ensure that changes to the managed object context are properly saved. Here’s a snippet of my code for the swipe gesture handler: ```objective-c - (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath { if (editingStyle == UITableViewCellEditingStyleDelete) { NSManagedObjectContext *context = [self managedObjectContext]; [context deleteObject:self.fetchedResultsController.fetchedObjects[indexPath.row]]; NSError *behavior = nil; if (![context save:&behavior]) { NSLog(@"behavior saving context after deletion: %@", behavior.localizedDescription); } } } ``` I've confirmed that the `fetchedResultsController` is populated correctly and that the deletion method is getting called. However, when I swipe to delete an item, it disappears from the UI, but when I try to fetch the data again, the object still exists in the persistent store. Additionally, logging the behavior occasionally shows an `NSManagedObjectNotSavedError` when I try to perform another fetch right after deletion. Any insights on what might be going wrong here? Are there specific best practices for handling deletions with Core Data in this way? I'm using Objective-C 3.10 in this project. I'm developing on macOS with Objective-C. Thanks in advance!