UICollectionView Performing Updates using performBatchUpdates

Question

I have a UICollectionView which I am trying to insert items into it dynamically/with animation. So I have some function that downloads images asynchronously and

Answer 1

I was facing the similar issue while deleting the item from index and this is what i think we need to do while using performBatchUpdates: method.

1# first call deleteItemAtIndexPath to delete the item from collection view.

2# Delete the element from array.

3# Update collection view by reloading data.

[self.collectionView performBatchUpdates:^{
            NSIndexPath *indexPath = [NSIndexPath indexPathForRow:sender.tag inSection:0];
            [self.collectionView deleteItemsAtIndexPaths:[NSArray arrayWithObject:indexPath]];
            [self.addNewDocumentArray removeObjectAtIndex:sender.tag];
        } completion:^(BOOL finished) {
            [self.collectionView reloadData];
        }];

This help me to remove all the crash and assertion failures.