iOS How to read next by NSFetchedResultsController

[mikezang]

I found all sample in Internet as below

- (NSFetchedResultsController *)fetchedResultsController {
    if (self.fetchedResults != nil) {
        return self.fetchedResults;
    }

    self.fetchedResults = [NSManagedObject MR_fetchAllGroupedBy:code withPredicate:filter sortedBy:code ascending:YES delegate:self];
    
    self.fetchedResults.delegate = self;

    return self.fetchedResults;
}

My question is if I need to fetch again by different predicate, can I comment code as below?

//    if (self.fetchedResults != nil) {
//        return self.fetchedResults;
//    }

 

[mikezang]

Maybe the right way is set fetchedResultsController to nil, then call method and without comment needed.