view.swift

class MyView: UIView {
    private var preferredMaxLayoutWidth: CGFloat? {
        didSet {
            invalidateIntrinsicContentSize()
            setNeedsLayout()
        }
    }
    
    override var intrinsicContentSize: CGSize {
        return performLayout(changeFrames: false, width: preferredMaxLayoutWidth)
    }

    override func layoutSubviews() {
        let width = bounds.size.width
        if width == UIView.layoutFittingExpandedSize.width {
            preferredMaxLayoutWidth = performLayout(changeFrames: false, width: nil).width
        } else if preferredMaxLayoutWidth != bounds.size.width {
            preferredMaxLayoutWidth = bounds.size.width
        } else {
            _ = performLayout(changeFrames: true, width: preferredMaxLayoutWidth)
            super.layoutSubviews()
        }
    }
    
    private func performLayout(changeFrames: Bool, width: CGFloat?) -> CGSize {
        // calculate new size here depends on width
        // change subviews frames if changeFrames == true
    }
}