IOS Swift3 how to Remove Custom UIView randomly

I am building an iOS Application in swift 3, where I am creating dynamic UIViews. I need to remove custom view randomly. Please help me I am stuck with this for a long time. Thanks In Advance

class ViewController: UIViewController { 

    var myView: subView! 
    var y : CGFloat! 
    @IBOutlet weak var addButton: UIButton!

    override func viewDidLoad() {
        y = 1
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    func cancelbutton(_ sender: UIButton) {
        myView.removeFromSuperview()
    }

    @IBAction func buttonAction(_ sender: Any) {
        y = y + 110
        myView = subView(frame: CGRect(x: 80, y: y, width: 300, height: 100))

        myView.backgroundColor = UIColor.green
        myView.actionButton.addTarget(self, action: (#selector(cancelbutton(_:))), for: UIControlEvents.touchUpInside)
        self.view.addSubview(myView)
    }
}

As you can see in the above image when i click on Close the SubView(custome View) closes, but where as MyView with green color does not go and stays there. Someone please Help.........

required init?(coder aDecoder: NSCoder)
   {
       super.init(coder: aDecoder)
       Bundle.main.loadNibNamed("subView",owner: self, options:nil)
       self.addSubview(self.views)
       Bundle.main.loadNibNamed("subView",owner: self, options:nil)
       self.addSubview(self.views)

   }
   override init(frame: CGRect)
   {
       super.init(frame: frame)
       Bundle.main.loadNibNamed("subView", owner: self, options: nil)
       views.frame = bounds
       self.addSubview(self.views)
   }

   @IBAction func buttonAction(_ sender: Any) {
       views.removeFromSuperview()

   }