Edit UILabel From inside a View Frame

I have a UILabel and a View in a Stack View inside of the ViewController where I have a GameScene in that same View.

'''''''''''''''  <- GameStartViewController
'      L      '
'  '''''''''  '     L = UILabel
'  '   V   '  '     V = View Frame
'  '       '  '
'  '       '  '
'  '       '  '
'  '''''''''  '
'             '
'''''''''''''''

I'm trying to update the label which is the score from inside the view but I keep getting

fatal error: unexpectedly found nil while unwrapping an Optional value

Even though it is connected, I can't change color, set text, etc...

Code:

GameScene.swift

var gs: GameStartViewController!

override func didMoveToView(view: SKView) {
    physicsWorld.contactDelegate = self
    self.backgroundColor = UIColor.feelFreeToColor()
    gs.scoreLabel.text = "\(score)" // THIS DOES NOT WORK
}

GameStartViewController.swift

@IBOutlet weak var selfView: SKView!
@IBOutlet weak var scoreLabel: UILabel!

override func viewDidLoad() {
    super.viewDidLoad()

    self.view.backgroundColor = UIColor.feelFreeToColor()
    self.initAdMobBanner()

    let scene: GameScene = GameScene(size: view.bounds.size)
    let skView = selfView
    scene.scaleMode = .AspectFill
    skView.presentScene(scene)

    scoreLabel.layer.addBorder(UIRectEdge.Bottom, color: UIColor.blackColor(), thickness: 3) // THIS WORKS
}

I can edit it from the view controller, but can't inside the view frame. How do I access it from inside the view frame?

Where are you setting the reference to the parent in your view (in your case to gs)?.

Try setting the parent reference in your ViewController like this:

override func viewDidLoad() {
    super.viewDidLoad()

    self.view.backgroundColor = UIColor.feelFreeToColor()
    self.initAdMobBanner()

    let scene: GameScene = GameScene(size: view.bounds.size)

    // Notice!
    scene.gs = self

    let skView = selfView
    scene.scaleMode = .AspectFill
    skView.presentScene(scene)

    scoreLabel.layer.addBorder(UIRectEdge.Bottom, color: UIColor.blackColor(), thickness: 3) // THIS WORKS
}