👀 Views: 505 💬 Answers: 1 📅 Created: 2025-06-13

core-data nsfetchedresultscontroller uitableview Objective-C

I'm experimenting with I just started working with I'm reviewing some code and I'm working on a project and hit a roadblock. I'm trying to use `NSFetchedResultsController` to manage my data display in a `UITableView`, but I'm running into issues where my `NSManagedObjectContext` is not updating the `UITableView` correctly. I have implemented the delegate methods, but the table view does not seem to reflect changes made to the context. Here's a snippet of my code to illustrate the setup: ```objc self.fetchController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext sectionNameKeyPath:nil cacheName:nil]; self.fetchController.delegate = self; NSError *behavior = nil; if (![self.fetchController performFetch:&behavior]) { NSLog(@"Unresolved behavior %@", behavior); } ``` When I add a new `NSManagedObject` to the context and save it, I expect the table view to update, but it doesn't. I'm calling `reloadData` on my table view after saving: ```objc [self.managedObjectContext save:&behavior]; [self.tableView reloadData]; ``` However, I get the following behavior message upon saving: `CoreData: behavior: Persistent store behavior`. I suspect something is wrong with my Core Data stack setup, but I've followed the tutorials. I've also checked that my `fetchRequest` is correctly set up with a valid entity and predicate. My `NSFetchedResultsControllerDelegate` methods are implemented as follows: ```objc - (void)controllerDidChangeContent:(NSFetchedResultsController *)controller { [self.tableView reloadData]; } ``` I would appreciate any insights into why the table view isn't updating, or if there's a specific configuration step I might be missing. Is there something I need to do differently for it to properly listen to changes in the context? The project is a mobile app built with Objective-C. Any ideas how to fix this? I'm working on a web app that needs to handle this. What are your experiences with this? Is there a better approach?