Simple custom view that auto wrap subviews to new rows

SimpleAutoWrapView.swift

final class SimpleAutoWrapView: UIView {

    private var arrangedSubviews: [UIView] = []
    private var calculatedIntrinsicContentSize = CGSize.zero {
        didSet {
            if oldValue != calculatedIntrinsicContentSize {
                invalidateIntrinsicContentSize()
            }
        }
    }

    var itemSpacing: CGFloat = 20
    var lineSpacing: CGFloat = 10

    func addArrangedSubview(_ subview: UIView) {
        addSubview(subview)
        arrangedSubviews.append(subview)
    }

    override func layoutSubviews() {
        super.layoutSubviews()

        let rect = bounds.inset(by: layoutMargins)
        print("layoutSubviews: \(rect)")

        var origin = rect.origin
        var rowHeight: CGFloat = 0
        arrangedSubviews.enumerated().forEach { index, subview in
            let size = subview.systemLayoutSizeFitting(rect.size)
            let isNewRow = (index > 0) && (origin.x + size.width > rect.maxX)
            if isNewRow {
                origin = CGPoint(x: rect.minX, y: origin.y + rowHeight + lineSpacing)
            }
            subview.frame = CGRect(origin: origin, size: size)

            origin.x += (size.width + itemSpacing)
            rowHeight = max(rowHeight, size.height)
        }
        let viewHeight = origin.y + rowHeight + layoutMargins.bottom
        calculatedIntrinsicContentSize = CGSize(width: bounds.width, height: viewHeight)

    }

    override var intrinsicContentSize: CGSize {
        print("intrinsicContentSize \(calculatedIntrinsicContentSize)")
        return calculatedIntrinsicContentSize
    }
}