👀 Views: 94 💬 Answers: 1 📅 Created: 2025-06-06

core-data uitableview nsfetchedresultscontroller Objective-C

I'm updating my dependencies and I'm currently working on an iOS app using Objective-C and Core Data. I've set up an `NSFetchedResultsController` to manage my data, which is supposed to automatically update my `UITableView` when the underlying data changes. However, I am working with an scenario where the table view does not refresh after I insert, update, or delete entries in Core Data. I've implemented the `NSFetchedResultsControllerDelegate` methods to listen for changes. Here's a snippet of the relevant code: ```objective-c - (void)controllerDidChangeContent:(NSFetchedResultsController *)controller { [self.tableView reloadData]; } - (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:UITableViewRowAnimationFade]; break; case NSFetchedResultsChangeDelete: [self.tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade]; break; case NSFetchedResultsChangeUpdate: [self.tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationNone]; break; case NSFetchedResultsChangeMove: [self.tableView moveRowAtIndexPath:indexPath toIndexPath:newIndexPath]; break; } } ``` Despite this setup, the `controllerDidChangeContent:` method is not getting called when I perform actions like saving a new object or deleting one. I’ve double-checked that my `NSFetchedResultsController` is correctly set up and that I’ve set the delegate to the view controller containing the table view. I initialize the fetched results controller like this: ```objective-c self.fetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext sectionNameKeyPath:nil cacheName:nil]; self.fetchedResultsController.delegate = self; ``` I also verify that the data changes are properly saved to the context. I call `[self.managedObjectContext save:&behavior];` and check if there were any errors during the save operation, but everything seems fine. What could be causing the `NSFetchedResultsController` to not notify the delegate? I've also tried restarting the app, but the scenario continues. I'm using Xcode 14 and targeting iOS 16. Any insights on what might be going wrong or how to debug this scenario further would be greatly appreciated! This is part of a larger REST API I'm building.