Learning iCloud Data Management: A Hands-On Guide to Structuring Data for iOS and OS X

Managing Persistent Store Changes

The sequence of events when a persistent store changes has been simplified. There are now five basic steps involved:

1. You receive NSPersistentStoreCoordinatorsStoresWillChange-Notification.

2. Save and reset your managed object context. If you use the names shown in Listing 17.1, your code would be similar to the following:[_managedObjectContext save:];[_managedObjectContext reset];

The argument after save is a pointer to an NSError.

3. Core Data removes the store.

4. You receive NSPersistentStoreCoordinatorsStoresDidChange-Notification.

5. Save the managed object context with the new store:

[_managedObjectContext save:];

If you are used to WWDC 2012, you may be thinking about dropping a persistent store and ...