iOS5 core data fetch freezes the app

Question

Starting from iOS5, my app started to freeze when using fetchedResultsController . I have attached the debugger result after quitting the simulator.

Any help will be appreciated.

Thanks

Answer 1

You say in the comments that you're using performSelectorInBackground: to update tableviews. This isn't right, all code affecting the UI should be executed on the main thread.

In addition (and I think this is what's causing the problem) you mustn't reuse a MOC across threads. Each thread must have its own MOC, which can then use the same NSPersistentStoreCoordinator .

You should read Apple's guide on this topic .