I\'ve been updating my apps to run on iOS 7 which is going smoothly for the most part. I have noticed in more than one app that the reloadData method of a
You can use this method
[collectionView reloadItemsAtIndexPaths:arayOfAllIndexPaths];
You can add all indexPath objects of your UICollectionView into array arrayOfAllIndexPaths by iterating the loop for all sections and rows with use of below method
[aray addObject:[NSIndexPath indexPathForItem:j inSection:i]];
I hope you understood and it can resolve your problem. If you need any more explanation please reply.