UICollectionView update a single cell

I am attempting to update a single cell inside a `UICollectionView`, specifically I am just trying to update an image in that specific cell detonated by `cell.imageView`. `[self.collectionView reloadData]` is not really an option because it makes the whole collection view flash. `[self.collectionView beginUpdates]` is not a thing in a `UICollectionView`it seems. I understand I may be able to use: ``` [self.collectionView performBatchUpdates:^{ //do something } completion:nil]; ``` I am not exactly sure what to put inside a completion block to update that certain cell's `imageView`. This is all being done inside of `didSelectItemAtIndexPath`.Also I am not using `NSFetchedResultsController`. Any ideas?