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

This issue just occured to me on 3x screens (namely the iPhone 6 Plus.) As it turned out, the autolayout engine did not really like infinite floating point values (such as .33333333), so my solution was to floor the return height in sizeForItemAt:indexPath:.

return CGSize(width: preferredWidth, height: floor(preferredHeight))