CODEWITHSUNDEEP
iosiphoneswiftsprite-kitskscene
Sam0711er
Sam0711er

Reputation: 894

Why does my ViewController not present another SKScene after reopening it?

so right now I'm programming a game and I'm experiencing an issue I didn't really found a solution for. I'll try to describe it for you.

So, in order to be able to explain my problem better, I created a schematic drawing for you guys:

Schematic drawing

Now here's the problem: I got two View Controller, one is called MenuVc, the other one is called GameVC. In GameVC I have a SKView that shows a specific SKScene when didMoveToView is called, named GameScene. GameScene has a didBeginContact method, which will then move to the other SKScene the SKView has, called GameOverScene, with the following code (Segue 1 in the drawing):

let reveal = SKTransition.crossFadeWithDuration(0.5)
let gameOverScene = GameOverScene(size: self.size, won: false)
self.view?.presentScene(gameOverScene, transition: reveal)

From here, the user can go back to GameScene in order to restart the Game (Segue 2 in the drawing). On GameScene, there's still another button, which will allow you to go back to the MenuVC via a NSNotificationCenter event (Segue 3 in the drawing). The code for this is the following:

In GameViewController.swift:

override func awakeFromNib() {
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "goToMenuViewController:", name: "GoToMenuViewController", object: nil)
}

@objc func goToMenuViewController(notification: NSNotification){

    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let vc = storyboard.instantiateViewControllerWithIdentifier("MenuVC")
    vc.modalTransitionStyle = UIModalTransitionStyle.CrossDissolve

    self.presentViewController(vc, animated: true, completion: nil)

    }
deinit{
    NSNotificationCenter.defaultCenter().removeObserver(self)
}

In GameScene.swift, when the backButton was pressed: 

NSNotificationCenter.defaultCenter().postNotificationName("GoToMenuViewController", object: self)

So if I now want to go back to GameVC using a Button on MenuVC (Segue 4 in the drawing), it all works fine. The SKView in GameVC shows the GameScene again, but when didBeginContact() is now called, it doesn't present GameOverScene. The function is called, I checked that, and it executes the code in it too, but it doesn't perform the segue (1) as it should. Do you have some ideas why and what I have to change? Is it something about deiniting when Segue 3 is called?

Code for GameVC's viewDidLoad:

let scene = GameScene(size: view.bounds.size)
        let skView = view as! SKView
        skView.ignoresSiblingOrder = true
        scene.scaleMode = .ResizeFill
        skView.presentScene(scene)

Code for Segue 4:

let storyboard = UIStoryboard(name: "Main", bundle: nil)
        let vc = storyboard.instantiateViewControllerWithIdentifier("GameVC")
        vc.modalTransitionStyle = UIModalTransitionStyle.CrossDissolve
        self.presentViewController(vc, animated: true, completion: nil)

Upvotes: 4

Views: 356

Answers (1)

Andrew
Andrew

Reputation: 15377

Make sure you are dismissing each view controller before attempting to present other view controllers.

I don't think UIKit really likes it if you try to present a view controller on top of another already being presented.

Upvotes: 2

Related Questions