NSFetchedResultsController_segment.m

- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject
       atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type
      newIndexPath:(NSIndexPath *)newIndexPath
{
    if (type == NSFetchedResultsChangeUpdate) {
        [[cachedTHJobs objectAtIndex:indexPath.row] refresh];
    }
}

- (void)registerNotifications
{
    NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
    [center addObserver:self
               selector:@selector(backgroundContextSaved:)
                   name:NSManagedObjectContextDidSaveNotification
                 object:self.context.parentContext];
    [center addObserver:self
               selector:@selector(backgroundContextChanged:)
                   name:NSManagedObjectContextObjectsDidChangeNotification
                 object:self.context.parentContext];
}

- (void)backgroundContextSaved:(NSNotification *)notification
{
    [self.context mergeChangesFromContextDidSaveNotification:notification];
}

- (void)backgroundContextChanged:(NSNotification *)notification
{
    NSArray *updatedObjects = [notification.userInfo valueForKey:NSUpdatedObjectsKey];
    for (Moment *item in updatedObjects) {
        [self.context performBlockAndWait:^{
            NSError *error = nil;
            Moment *moment = (Moment *)[self.context existingObjectWithID:item.objectID error:&error];
            moment.progress = item.progress;
        }];
    }
}