class ViewController: UIViewController {


    @IBOutlet weak var graphView: UIView!
    @IBOutlet weak var containerView: UIView!
    let backgroundColor = CAGradientLayer().graphViewBackgroundColor()

    override func viewDidLoad() {
        super.viewDidLoad()
   }

    override func viewDidLayoutSubviews() {

        super.viewDidLayoutSubviews()
        backgroundColor.frame = self.graphView.bounds
        self.graphView.layer.addSublayer(backgroundColor)

    }
}

//backgroundColor.frame = self.graphView.bounds
    //self.graphView.layer.addSublayer(backgroundColor)