Learning Core Data for iOS: A Hands-On Guide to Building Core Data Applications

iCloud Notifications

Once the iCloud Store is ready, a notification called NSPersistentStoreCoordinatorStoresWillChangeNotification will be sent to indicate that the store is about to change. Once it is changed, another notification called NSPersistentStoreCoordinatorStoresDidChangeNotification will be sent. Additionally, when a store imports ubiquitous content, a notification called NSPersistentStoreDidImportUbiquitousContentChangesNotification is sent. All of these notifications must be observed in order to trigger an appropriate response. Listing 14.5 shows the code involved in a new method called listenForStoreChanges, which is used to configure the application to observe these critical notifications.

Listing 14.5 CoreDataHelper.m: listenForStoreChanges ...