UIStackView add backgroundColor

uistackview-extended.swift

// fix issue UIStackView that background doesn't work
    private var bkgColor: UIColor?
    override public var backgroundColor: UIColor? {
        get { return bkgColor }
        set {
            bkgColor = newValue
            setNeedsLayout()
        }
    }

    private lazy var backgroundLayer: CAShapeLayer = {
        let layer = CAShapeLayer()
        self.layer.insertSublayer(layer, at: 0)
        return layer
    }()

    override public func layoutSubviews() {
        super.layoutSubviews()
        backgroundLayer.path = UIBezierPath(rect: self.bounds).cgPath
        backgroundLayer.fillColor = self.backgroundColor?.cgColor
    }

Actually you can loose the "super.layoutSubviews()" call. "layoutSubviews()" is a prototype (empty) method.