Why does UICollectionView log an error when the cells are fullscreen?

Question

I have a UICollectionViewController using a UICollectionViewFlowLayout where my itemSize is the size of the UICollectionView

Answer 1

I had similar issue.

After load cell which is full width and some height of screen. on some condition I changed the height of cell then I was getting the same error

to fix this

I used

   func updateHeightPerRatio(with image:UIImage) {
    let ratio = collectionView.bounds.width / image.size.width
    constHeightCollectionView .constant =  ceil(image.size.height * ratio)
    collectionView.reloadData()
    collectionView.performBatchUpdates({
        collectionView.layoutIfNeeded()
    }) { (completed) in
        self.collectionView.reloadData()
        self.layoutIfNeeded()
    }
}

Solution is reload data then perform batchupdate with that collection view re -calculate the frames . after that reload collectionview again it will apply calculated frames to cell

And now there is no log for issue now.

Hope it is helpful