example UICollectionView with dynamic height inside a UITableViewCell

UICollectionView in a UITableViewCell both with dynamic heights

/**************
My cell has a label and under it a collection view with varying number of buttons in different sizes
So I'm letting Autolayout set the position of things and then taking all heights together for the cell height size
*************/
class ButtonCollectionCell: UITableViewCell {
    
    @IBOutlet weak var titleLabel: UILabel!
    @IBOutlet weak var collectionViewDistanceFromCellBottomConstraint: NSLayoutConstraint!
    @IBOutlet weak var distanceBetweenCollectionToLabelConstraint: NSLayoutConstraint!
    @IBOutlet weak var buttonsCollectionView: UICollectionView!
    
    override func awakeFromNib() {
        super.awakeFromNib()
        
        let layout = CenterAlignedCollectionViewFlowLayout()
        layout.scrollDirection = .vertical
        layout.minimumLineSpacing = 5
        layout.minimumInteritemSpacing = 5
        layout.estimatedItemSize = CGSize(width: 1, height: 1)
        buttonsCollectionView.register(MDCChipCollectionViewCell.self, forCellWithReuseIdentifier: "MDCChipCollectionViewCell")
        buttonsCollectionView.setCollectionViewLayout(layout, animated: false)
        buttonsCollectionView.allowsMultipleSelection = true
        buttonsCollectionView.isScrollEnabled = true
        
    }
    
    override func systemLayoutSizeFitting(_ targetSize: CGSize, withHorizontalFittingPriority horizontalFittingPriority: UILayoutPriority, verticalFittingPriority: UILayoutPriority) -> CGSize {
        //Comment: here we give the collectionView to layout it's items with a very large height so it will take all the space he needs and then we calculate the cell height with all the constraints in place (this method is called after the storyboard constraints are set so you have to take them into account
        //Maybe it clearer to write all these outlets by code and keep constants for the constraints and not use constraint outlets
        
        buttonsCollectionView.frame = CGRect(x: buttonsCollectionView.frame.origin.x, y: buttonsCollectionView.frame.origin.y, width: buttonsCollectionView.frame.width , height: 10000)
        
        buttonsCollectionView.layoutIfNeeded()
        
        let newCellSize = CGSize(width: buttonsCollectionView.collectionViewLayout.collectionViewContentSize.width, height: buttonsCollectionView.collectionViewLayout.collectionViewContentSize.height + collectionViewDistanceFromCellBottomConstraint.constant + distanceBetweenCollectionToLabelConstraint.constant + titleLabel.frame.height)
        
        return newCellSize
    }

}