UIView debugging helper

UIView+Debugging.swift

public extension UIView {

    static var debugColors: [UIColor] {
        return [
            .red,
            .green,
            .blue,
            .cyan,
            .yellow,
            .magenta,
            .orange,
            .purple,
            .brown
        ]
    }

    @objc func debugViews() {
        debug()
    }

    func debug(startIndex: Int? = nil) {
        var index = startIndex ?? 0

        subviews.forEach { view in
            view.layer.borderWidth = 1
            let color = UIView.debugColors[index]
            view.layer.borderColor = color.withAlphaComponent(0.2).cgColor
            view.backgroundColor = color.withAlphaComponent(0.05)
            index = index == UIView.debugColors.count - 1 ? 0 : index + 1
            view.debug(startIndex: index)
        }
    }
}