Question

Currently I am doing the following to iterate on a NSMutableIndexSet:

 if ([indexSet isNotNull] && [indexSet count] > 0){
        __weak  PNRHighlightViewController *weakSelf = self;
        [indexSet enumerateIndexesUsingBlock:^(NSUInteger idx, BOOL *stop) {
            if ([[self.highlightedItems_ objectAtIndex:idx] isNotNull]){
                NSIndexPath *indexPath = [NSIndexPath indexPathForRow:idx inSection: [weakSelf.collectionView numberOfSections]-1];
                [weakSelf.collectionView reloadItemsAtIndexPaths:[NSArray arrayWithObject:indexPath]];
            }
        }];
    }

I wanted to generate a NSIndexPath array and then reload the whole collectionView at those index paths. So basically I want to call the reload after the block is complete. How can I do so?

Answer 1

One way to do this would be,

[indexSet enumerateIndexesUsingBlock:^(NSUInteger idx, BOOL *stop) {
            if ([[self.highlightedItems_ objectAtIndex:idx] isNotNull]){
                NSIndexPath *indexPath = [NSIndexPath indexPathForRow:idx inSection: [weakSelf.collectionView numberOfSections]-1];
                //store the indexPaths in an array or so
            }
            if (([indexSet count] - 1) == idx) { //or ([self.highlightedItems_ count] - 1)
               //reload the collection view using the above array
            }
        }];
    }