Notification keys The keys you use to retrieve values from a notification’s user info dictionary. TopicsConstantsNSAddedPersistentStoresKeyNSRemovedPersistentStoresKeyNSUUIDChangedPersistentStoresKeyNSPersistentStoreConnectionPoolMaxSizeKeyNSPersistentStoreSaveConflictsErrorKeyNSPersistentStoreUbiquitousTransitionTypeKey See AlsoResponding to changes of the coordinator’s registered storesNSPersistentStoreCoordinatorStoresWillChangeNSPersistentStoreCoordinatorStoresDidChangeNSPersistentStoreCoordinatorWillRemoveStore