UICollectionViewLayout 'locked' error message

Question

After (successfully) calling

__weak typeof(self) wself = self;
[self.collectionView performBatchUpdates:^{
    [wself.collectionView.collectionViewLayout invalidateLayout];
    [wself.collectionView setCollectionViewLayout:self.layoutDeletion animated:YES];
        } completion:nil];

I receive the following error message:
trying to load collection view layout data when layout is locked

the operation works fine, except that one particular UICollectionViewCell not loading its subviews.
I have never seen this error message before, including google. Any ideas what might cause this?

Answer 1

The error is being generated by calling setCollectionViewLayout within performBatchUpdates. It is unclear if this is expected behavior (a coding error) or a bug in iOS. You can report the issue to Apple, but in the meantime you should refactor to perform the layout change without batch updates. You can always use the completion handler to perform any additional updates to the collection view.