How to enable iCloud for Core Data?

Question

This is the first time I'm trying to make this work. I'm following the iCloud Programming Guide for Core Data, the "Using the SQLite Store with iCloud" section, and in AppDelegate I have:

- (NSPersistentStoreCoordinator *)persistentStoreCoordinator
{
   // The persistent store coordinator for the application. This implementation creates and return a coordinator, having added the store for the application to it.
   if (_persistentStoreCoordinator != nil) {
       return _persistentStoreCoordinator;
   }

   // Create the coordinator and store

   _persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
   NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"MyApp.sqlite"];
   NSError *error = nil;
   NSString *failureReason = @"There was an error creating or loading the application's saved data.";

   // To enable iCloud
   NSDictionary *storeOptions = @{NSPersistentStoreUbiquitousContentNameKey: @"MyAppCloudStore"};

   if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:storeOptions error:&error]) {
       // Report any error we got.
       NSMutableDictionary *dict = [NSMutableDictionary dictionary];
       dict[NSLocalizedDescriptionKey] = @"Failed to initialize the application's saved data";
       dict[NSLocalizedFailureReasonErrorKey] = failureReason;
       dict[NSUnderlyingErrorKey] = error;
       error = [NSError errorWithDomain:@"YOUR_ERROR_DOMAIN" code:9999 userInfo:dict];
       // Replace this with code to handle the error appropriately.
       // abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
       NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
       abort();
   }

   return _persistentStoreCoordinator;
}

Previously, I enabled iCloud services for this App ID, create the corresponding provisioning, and turn on the iCloud services in Xcode's capabilities (iCloud Documents and default container).

According to the iCloud Programming Guide for Core Data, at this point:

Test: Run the app on a device. If Core Data successfully created and configured an iCloud-enabled persistent store, the framework logs a message containing “Using local storage: 1,” and, later, another message containing “Using local storage: 0”.

I run the app on an iPhone, and persistentStoreCoordinator is retrieved, but I see nothing in Xcode's debug area.

What am I missing?

Thanks?

AppsDev AppsDev · Accepted Answer · 2015-02-11T19:06:17

I found the problem: [[NSFileManager defaultManager] ubiquityIdentityToken] was returning nil, and it was because I had my device not updated to iCloud Drive.

I found the response in this post.

How to enable iCloud for Core Data?

1 Answers