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

Took the solution by d4Rk which is great, except in my case it would keep cutting off the bottom of my collection view (too short). I figured out this was because intrinsic content size was sometimes 0 and this would throw off the calculations. IDK. All I know is this fixed it.

import UIKit

class SelfSizedCollectionView: UICollectionView {
    override func reloadData() {
        super.reloadData()
        self.invalidateIntrinsicContentSize()
    }

    override var intrinsicContentSize: CGSize {
        let s = self.collectionViewLayout.collectionViewContentSize
        return CGSize(width: max(s.width, 1), height: max(s.height,1))
    }

}

Answer 2

work for me

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

    foodCollectionView.setNeedsLayout()
    foodCollectionView.layoutIfNeeded()