var scrollview = UIScrollView()

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

        let viewX = self.view.frame.width
        let viewY = self.view.frame.height
        scrollview.frame = CGRect(x:0, y:0, width:viewX , height:viewY/2)
        scrollview.backgroundColor = UIColor.red
        scrollview.contentSize = CGSize(width:viewX * 2 , height:viewY/2)
        self.view.addSubview(scrollview)
    }