CardView.swift

class CardView: UIView {
    @IBOutlet weak var title: UILabel!
    @IBOutlet weak var image: UIImageView!
    @IBOutlet weak var collectionView: UICollectionView!

    func setupCardView() {
        .....
    }

    override func layoutSubviews() {
        super.layoutSubviews()
        if !__CGSizeEqualToSize(collectionView.bounds.size, collectionView.intrinsicContentSize) {
            collectionView.invalidateIntrinsicContentSize()
        }
    }

    override var intrinsicContentSize: CGSize {
        return CGSize(width: self.frame.width, height: self.frame.height)
    }

    override init(frame: CGRect) {
        super.init(frame: frame)
        commonInit()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        commonInit()
    }

    func commonInit() {
        //NotificationCenter.default.addObserver(self, selector: #selector(handleTap), name: NSNotification.Name("HandleTap"), object: nil)
    }

    @objc func handleTap() {
        resizeToFitSubviews()
    }

    /// Method to resize the View
    func resizeToFitSubviews() {
        var width: CGFloat = 0
        var height: CGFloat = 0
        for someView in self.subviews {
            let aView = someView
            let newWidth = aView.frame.origin.x + aView.frame.width
            let newHeight = aView.frame.origin.y + aView.frame.height
            width = max(width, newWidth)
            height = max(height, newHeight)
        }

        frame = CGRect(x: frame.origin.x, y: frame.origin.y, width: width, height: height)
        self.layoutIfNeeded()
    }
}

extension CardView {
    /// private function to set viewmodel's bindings
    private func setupBindings() {
        ......
    }

    /// private function to set datasource for collectionview
    private func setupCardViewDataSource() {
        cardDataSource = RxCollectionViewSectionedReloadDataSource
        <SectionModel<String, CardModel>> {(_, _, indexPath, element) -> UICollectionViewCell in
                return  self.configureCell(cardModel: element, indexPath: indexPath)
        }
        if let source = cardDataSource {
            viewModel.cardItems.bind(to: collectionView.rx.items(dataSource: source)).disposed(by: disposeBag)
        }
    }
}

extension CardView: UICollectionViewDelegate {
    /// private function to configure CardView
    private func configureCardView() {
        self.collectionView.register(
            UINib(nibName: "CardCell",
                  bundle: nil),
            forCellWithReuseIdentifier: "CardCell")
        collectionView.rx.setDelegate(self).disposed(by: disposeBag)
        setupCardViewDataSource()

        collectionView.setContentOffset(CGPoint(x: 0, y: CGFloat.greatestFiniteMagnitude), animated: false)
        let snappingLayout = Layout()
        snappingLayout.snapPosition = .center
        snappingLayout.scrollDirection = .horizontal
        collectionView.collectionViewLayout = snappingLayout
        collectionView.decelerationRate = .fast
        collectionView.layoutIfNeeded()
    }

    func configureCell(cardModel: CardModel, indexPath: IndexPath) -> UICollectionViewCell {
        if let cell = collectionView.dequeueReusableCell(
            withReuseIdentifier: "CardCell",
            for: indexPath) as? CardCollectionViewCell {
            cell.cardModel = cardModel
            cell.configureCell()
            return cell
        }
        return UICollectionViewCell()
    }
}

extension CardView: UICollectionViewDelegateFlowLayout {
    func collectionView(
        _ collectionView: UICollectionView,
        layout collectionViewLayout: UICollectionViewLayout,
        sizeForItemAt indexPath: IndexPath) -> CGSize {
        return CGSize(width: self.frame.width, height: self.frame.height)
    }
}