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2. instantiate from class with parameters

//  MyView

class MyView: UIView {

    var color: UIColor

    

    required init(frame: CGRect, color: UIColor) {

        self.color = color

        super.init(frame: frame)

        

        // do anything after instantiated

        self.backgroundColor = self.color

    }

    

    required init?(coder aDecoder: NSCoder) { // never called

        fatalError("init(coder:) has not been implemented")

    }

    

}

//  ViewController.swift

override func viewDidLoad() {

        ...

        let myView = MyView(frame: CGRect(x: 0, y: 0, width: 100, height: 200), color: UIColor.cyan)

        ...

    }