USES: MyLabel

class ViewController: UIViewController {
    var label : MyLabel? = nil // Add here
    override func viewDidLoad() {
        super.viewDidLoad()
        label = MyLabel( 
                    text: "The Demo Text", 
                    textColor: UIColor.red, 
                    fontSize: UIFont.systemFont(ofSize: 20), 
                    textAlign: .center
        )
        label?.frame = CGRect(x: 20, y: 80, width: 300, height: 40)
        view.addSubview(label!)
    }
}

USES: MyUIButton

class ViewController: UIViewController {
}