CustomViewLayoutWithAutoLayoutSupport.swift

class View: UIView {

    override var intrinsicContentSize: CGSize {
        // Fallback to super class implementation of intrinsicContentSize
        return viewContentSize() ?? super.intrinsicContentSize
    }

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

    @available(*, unavailable)
    required init?(coder aDecoder: NSCoder) { fatalError() }

    override func layoutSubviews() {
        super.layoutSubviews()

        // If intrinsic size for view exists it must match bounds. Else intrinsicContentSize hasn't been updated
        if let contentSize = viewContentSize(), contentSize != bounds.size {
            invalidateIntrinsicContentSize()
        }
    }

    func viewContentSize() -> CGSize? {
        guard bounds.width > 0 else { return nil } // Wait for some valid width
        // Size calc
        return CGSize(width: bounds.width, height: bounds.width/2)
    }
}