How to adjust height of UICollectionView to be the height of the content size of the UICollectionView?

Question

I would like the UICollectionView (The red one) to shrink to the height of the content size in this case UICollectionViewCells(the yellow ones) because there is a lot of emp

Answer 1

work for me

    let heightRes = resCollectionView.collectionViewLayout.collectionViewContentSize.height
    foodHeightConstrant.constant = height.advanced(by: 1 )

    foodCollectionView.setNeedsLayout()
    foodCollectionView.layoutIfNeeded()