@IBDesignable
class MyImageView: UIImageView {

    @IBInspectable var bkgColor: UIColor = .green

    override init(image: UIImage?) {
        super.init(image: image)
        commonInit()
    }

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

    required init?(coder: NSCoder) {
        super.init(coder: coder)
        commonInit()
    }

    override func prepareForInterfaceBuilder() {
        super.prepareForInterfaceBuilder()
        commonInit()
    }

    func commonInit() -> Void {
        backgroundColor = bkgColor
    }

}