Am I loading ViewController over ViewController

Hi I have a spriteKit game set up where everytime the user dies Ill get a pop up ViewController with Try again button and some iAds set up.

I have a segue to the viewController and an unwind segue from the VC to the gameViewController.

When I call the unwind func I reinitialize the scene for different reasons. My question is, am I creating view over view which will eventually lead to a crash or am I correctly reinitializing the scene. I took the code from viewDidLoad and put it into a function called "setUp()" and I call that function from the unwindSegue.

check it out: (all in GameViewController)

  var currentLevel: Int!
var gameScene = GameScene()

override func viewDidLoad() {
    super.viewDidLoad()

    currentLevel = gameScene.currentLevel
    setUp()


}
 @IBAction func perpareForUnwind(unwindSegue: UIStoryboardSegue) {
    setUp()
}

func setUp() {

    if let scene = GameScene.level(currentLevel) {
        // Configure the view.
        let skView = self.view as SKView
        skView.showsFPS = true
        skView.showsNodeCount = true

        /* Sprite Kit applies additional optimizations to improve rendering performance */
        skView.ignoresSiblingOrder = true

        /* Set the scale mode to scale to fit the window */
        scene.scaleMode = .AspectFill

        skView.presentScene(scene)

        scene.viewController = self

    }
}