UICollectionViewFlowLayout subclass crashes accessing array beyond bounds while scrolling and reloading

Question

I have a UICollectionView that uses a custom subclass of UICollectionViewFlowLayout to make the section headers stick to the top of the screen while scrolling just like UITableV

Answer 1

I have same problem. and I fixed it.

__weak typeof(self) weakSelf = self;
UICollectionView *collectionView = self.collectionView;
[UIView performWithoutAnimation:^{
    [collectionView performBatchUpdates:^{
        collectionView.collectionViewLayout = layout;
    } completion:^(BOOL finished) {
        __strong typeof(self) strongSelf = weakSelf;
        if (strongSelf){
            [strongSelf reloadThumbData];
        }
    }];
}];