обновил существующий проект Objective- C Xcode с coredata и iCloud до CloudKit

Question

возможно ли обновить существующий проект Xcode Objective- C с помощью coredata и iCloud до CloudKit?

Я использую следующий код, но в последнее время он больше не синхронизируется между несколькими устройствами. мне нужно обновить что-либо в моем коде?

Я пытался включить Cloudkit в приложении, но он все еще не работает. Я включил также фоновые удаленные уведомления

- (NSPersistentStoreCoordinator *)persistentStoreCoordinator
{
if((persistentStoreCoordinator != nil)) {
    return persistentStoreCoordinator;
}

persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: [self managedObjectModel]];
NSPersistentStoreCoordinator *psc = persistentStoreCoordinator;

// Set up iCloud in another thread:

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

    // ** Note: if you adapt this code for your own use, you MUST change this variable:
    //NSString *iCloudEnabledAppID = @"iCloud.com.xxx";
    //NSString *iCloudEnabledAppID = @"com_xxx_xxx";
    //NSString *iCloudEnabledAppID = [[NSBundle mainBundle] infoDictionary][@"CFBundleIdentifier"];
    NSString *iCloudEnabledAppID = @"iCloud~com~xxx~xxx";

    // ** Note: if you adapt this code for your own use, you should change this variable:
    NSString *dataFileName = @"XXX.sqlite";

    // ** Note: For basic usage you shouldn't need to change anything else

    NSString *iCloudDataDirectoryName = @"Data.nosync";
    NSString *iCloudLogsDirectoryName = @"Logs";
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSURL *localStore = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:dataFileName];
    NSURL *iCloud = [fileManager URLForUbiquityContainerIdentifier:nil];

    if (iCloud) {

        NSLog(@"iCloud is working");

        NSURL *iCloudLogsPath = [NSURL fileURLWithPath:[[iCloud path] stringByAppendingPathComponent:iCloudLogsDirectoryName]];

        NSLog(@"iCloudEnabledAppID = %@",iCloudEnabledAppID);
        NSLog(@"dataFileName = %@", dataFileName);
        NSLog(@"iCloudDataDirectoryName = %@", iCloudDataDirectoryName);
        NSLog(@"iCloudLogsDirectoryName = %@", iCloudLogsDirectoryName);
        NSLog(@"iCloud = %@", iCloud);
        NSLog(@"iCloudLogsPath = %@", iCloudLogsPath);

        if([fileManager fileExistsAtPath:[[iCloud path] stringByAppendingPathComponent:iCloudDataDirectoryName]] == NO) {
            NSError *fileSystemError;
            [fileManager createDirectoryAtPath:[[iCloud path] stringByAppendingPathComponent:iCloudDataDirectoryName]
                   withIntermediateDirectories:YES
                                    attributes:nil
                                         error:&fileSystemError];
            if(fileSystemError != nil) {
                NSLog(@"Error creating database directory %@", fileSystemError);
            }
        }

        NSString *iCloudData = [[[iCloud path]
                                 stringByAppendingPathComponent:iCloudDataDirectoryName]
                                stringByAppendingPathComponent:dataFileName];

        NSLog(@"iCloudData = %@", iCloudData);

        NSMutableDictionary *options = [NSMutableDictionary dictionary];
        [options setObject:[NSNumber numberWithBool:YES] forKey:NSMigratePersistentStoresAutomaticallyOption];
        [options setObject:[NSNumber numberWithBool:YES] forKey:NSInferMappingModelAutomaticallyOption];
        [options setObject:iCloudEnabledAppID            forKey:NSPersistentStoreUbiquitousContentNameKey];
        [options setObject:iCloudLogsPath                forKey:NSPersistentStoreUbiquitousContentURLKey];

        [psc lock];
        //[psc performBlockAndWait:];

        [psc addPersistentStoreWithType:NSSQLiteStoreType
                          configuration:nil
                                    URL:[NSURL fileURLWithPath:iCloudData]
                                options:options
                                  error:nil];

        [psc unlock];
    }
    else {
        NSLog(@"iCloud is NOT working - using a local store");
        NSMutableDictionary *options = [NSMutableDictionary dictionary];
        [options setObject:[NSNumber numberWithBool:YES] forKey:NSMigratePersistentStoresAutomaticallyOption];
        [options setObject:[NSNumber numberWithBool:YES] forKey:NSInferMappingModelAutomaticallyOption];

        [psc lock];

        [psc addPersistentStoreWithType:NSSQLiteStoreType
                          configuration:nil
                                    URL:localStore
                                options:options
                                  error:nil];
        [psc unlock];

    }

    dispatch_async(dispatch_get_main_queue(), ^{
        [[NSNotificationCenter defaultCenter] postNotificationName:@"SomethingChanged" object:self userInfo:nil];
    });
});

return persistentStoreCoordinator;
}