Why CollectionView cell insider other collectionView has wrong size?

Question

I have a collectionView (nested) inside a collectionViewCell. When I open this VC, the cell inside nested collectionView have wrong size. After scroll down and up - everything is fine. I think when I am scrolling method layoutSubviews are calling. But when I added cell.setNeedsLayout() cell.layoutIfNeeded() inside func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) the result is not change.

Constraints:

Answer 1

i think problem is not with the size, it is from constraints.

Would you please share a snippet of your code