Calling a func of GameViewController from GameScene - ios

Question

I want to call a func of GameViewController from the GameScene.
-> If the game Ends I want to call GameViewController().GameOver()
I tried now a lot of different things like this one: LINK (I tried every answer more than once, still not working)
But doesn't matter what I tried it doesn't even call the func.
Hope anyone can help me with this.
CODE:
GameViewController:
class GameViewController: UIViewController {
#IBOutlet weak var Button: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
if let view = self.view as! SKView? {
// Load the SKScene from 'GameScene.sks'
if let scene = GameScene(fileNamed: "GameScene") {
// Set the scale mode to scale to fit the window
if UIDevice().userInterfaceIdiom == .phone {
scene.scaleMode = .aspectFill
}else{
scene.scaleMode = .aspectFit
}
// Present the scene
view.presentScene(scene)
skView = view
}
view.ignoresSiblingOrder = true
view.showsFPS = false
view.showsNodeCount = false
}
...
#IBAction func Button(_ sender: Any) {
animation()
if let gameScene = skView.scene as? GameScene { // check to see if the current scene is the game scene
gameScene.start()
}
}
func animation(){
UIButton.animate(withDuration: 1, animations: {
self.Button?.alpha = 0
})
}
func GameOver(){
UIButton.animate(withDuration: 1, animations: {
self.Button?.alpha = 1
})
}
}
GameScene:
class GameScene: SKScene, SKPhysicsContactDelegate {
...
func torpedoDidCollideWithAlien (torpedoNode:SKSpriteNode, alienNode:SKSpriteNode) {
GameViewController().GameOver()
removeAllActions()
removeAllChildren()
}
}

Answer 1

Option 1:
You should pass GameViewController instance when you are calling GameScene from GameViewController at the first time, Then just save this instance in some var gameVC: GameViewController! and initialize it like you do in prepare for segue method.
Then you'll be able to call gameVC.GameOver()
Option 2:
Put this in GameScene when you want to call GameOver():
if let controller = self.view?.window?.rootViewController as? GameViewController {
controller.GameOver()
}