👀 Views: 59 💬 Answers: 1 📅 Created: 2025-06-12

core-data nsfetchedresultscontroller uitableview Objective-C

I'm learning this framework and I'm currently implementing a `NSFetchedResultsController` to manage my data presentation in a `UITableView`, but I'm working with issues where the table view is not updating correctly when the underlying data changes. I've set up the fetched results controller and its delegate, but despite the delegate methods being called, the table view does not reflect the changes. Here's a snippet of my implementation: ```objective-c self.fetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext sectionNameKeyPath:nil cacheName:nil]; self.fetchedResultsController.delegate = self; NSError *behavior = nil; if (![self.fetchedResultsController performFetch:&behavior]) { NSLog(@"Failed to perform fetch: %@", behavior); } ``` In the delegate methods, I am trying to apply updates to the table view: ```objective-c - (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type newIndexPath:(NSIndexPath *)newIndexPath { switch (type) { case NSFetchedResultsChangeInsert: [self.tableView insertRowsAtIndexPaths:@[newIndexPath] withRowAnimation:UITableViewRowAnimationAutomatic]; break; case NSFetchedResultsChangeDelete: [self.tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic]; break; case NSFetchedResultsChangeUpdate: [self.tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationNone]; break; case NSFetchedResultsChangeMove: [self.tableView moveRowAtIndexPath:indexPath toIndexPath:newIndexPath]; break; } } ``` However, when I add or delete an item, the `controllerDidChangeContent:` method is called: ```objective-c - (void)controllerDidChangeContent:(NSFetchedResultsController *)controller { [self.tableView endUpdates]; } ``` But the table view remains unchanged. I've confirmed that the data in Core Data is being modified correctly, and I'm using iOS 15.0. I'm wondering if there's something wrong with how I'm using the `NSFetchedResultsController` or if I need to trigger a manual reload of the table view under certain conditions. Any insights or suggestions would be greatly appreciated! Thanks for your help in advance!