Core Data app crashing with “controllerWillChangeContent : unrecognized selector sent to instance”

Question

I\'ve got a core data app with 2 views. The first view lists \"Rooms\", the second lists \"Scenes\" in rooms. The Rooms page has an edit NavItem button, which when pressed e

Answer 1

Even I faced the same issue. But for iOS 4.2 the problem is NSError is initialized, so it is treated as garbage and while updating/inserting we have

if (![managedObjectContext save:&error]) {
        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
        exit(-1);
    }

So in save the iOS treats the error as garbage and so the exception. Try to initialize it to nil. It solved my problem. The issue is seen only with 4.2iOS.

Answer 2

That error is most likely coming from a NSFetchedResultsController that has a released delegate. Do you have a UIViewController that you released and didn't release the associated NSFetchedResultsController?