UIViewController不会选择另一个UIViewController吗？

Question

I have my GameViewController that contains a SCNView. I can segue to my GameViewController but when my player dies I try to segue to my GameOverVC but it does not segue. I know the code is being called because I print something to the console. The segue is setup in the storyboard.

I segue by calling

self.performSegue(withIdentifier: "gameOver", sender: self)

I have done this in multiple apps but I can not figure out why this is not working. This is my first app with SceneKit so I don't know if that changes anything but any help is appreciated!

Also

If I try

let vc = self.view.window?.rootViewController

vc?.present(GameOverVC(), animated: true, completion: nil)

Then it does present the UIViewController but it does not show anything I have added in that view?

Answer 1

segue works for UIVIewControllers not for SpriteKit scenes . So, you need to perform segue from parent viewcontroller , so you can do something like,

 self.parentViewController.performSegue(withIdentifier: "gameOver", sender: self)

Or as mentioned by @ZeMoon in this answer , you can make property of your viewcontroller in SKScene class and you can perform segue over this property something like ,

 class GameScene: SKScene {
    var viewController: UIViewController?
    ...
 } 

Then, in the viewController class, just before skView.presentScene(scene) do,

  scene.viewController = self

Now you can perform segue like,

  self.viewController.performSegueWithIdentifier("gameOver", sender: self.viewController)

OR

Forget segue just instantiate your GameOverVC and push it on your navigation controller like,

    let nav = self.view.window?.rootViewController as! UINavigationController

    nav.pushViewController(gameOverVC, animated: true)

Or

   self.navigationController?.pushViewController(gameOverVC, animated: true)

Answer 2

Somehow I had the same problem and asynchronous-call rescue me: I did something like this:

 DispatchQueue.main.asyncAfter(deadline: .now()) {

        self.performSegue(withIdentifier: "gameOver", sender: self)
    }

if you need to segue from an object that is not a ViewController inherited class, you need to pass a ref of the parentViewController to your object and make the call like this:

DispatchQueue.main.asyncAfter(deadline: .now()) {

        parentViewController.performSegue(withIdentifier: "gameOver", sender: self)
    }

Answer 3

You can try following :-

UIViewController *vc = self.view.window.rootViewController;
[vc performSegueWithIdentifier:@"id" sender:nil];