Meu snippet NSFetchedResultsController

#pragma mark - NSFetchedResultsController
- (NSFetchedResultsController *)fetchedResultsController
{
    if (fetchedResultsController != nil) {
        return fetchedResultsController;
    }

    // Set up the fetched results controller.
    // Create the fetch request for the entity.
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    // Edit the entity name as appropriate.
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"<#Entity name#>" inManagedObjectContext:self.managedObjectContext];
    [fetchRequest setEntity:entity];

    // Set the batch size to a suitable number.
    [fetchRequest setFetchBatchSize:20];

    // Edit the sort key as appropriate.
    NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"<#Sort Property#>" ascending:NO];
    NSArray *sortDescriptors = [NSArray arrayWithObjects:sortDescriptor, nil];
    [fetchRequest setSortDescriptors:sortDescriptors];

    NSPredicate *latestPredicate = [NSPredicate predicateWithFormat:@"<#Predicate Format#>"];
    fetchRequest.predicate = latestPredicate;

    NSFetchedResultsController *aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext sectionNameKeyPath:nil cacheName:nil];
    aFetchedResultsController.delegate = self;
    fetchedResultsController = aFetchedResultsController;

    NSError *error = nil;
    if (![fetchedResultsController performFetch:&error]) {
        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);

    }

    return fetchedResultsController;
}

- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller {
    [<#Container#> reloadData];
}