CODEWITHSUNDEEP
swiftsprite-kit
chronos
chronos

Reputation: 537

how to let one scene know an argument value of another?

In the LevelsScene class I have the code below for selecting a level. The level is simply a string value.

    override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {

    for touch: AnyObject in touches {
        let location = touch.locationInNode(self)
        if button1.containsPoint(location){
            let gameScene = GameScene(size: self.size, level:"Level1")
            self.view?.presentScene(gameScene)
        } else if button2.containsPoint(location){
            let gameScene = GameScene(size: self.size, level:"Level2")
            self.view?.presentScene(gameScene)
        } else if button3.containsPoint(location){
            let gameScene = GameScene(size: self.size, level:"Level3")
            self.view?.presentScene(gameScene)
        }
    }
}

In the GameOverScene class I would like to pass the level string value to the following code:

    override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
    let gameScene = GameScene(size: self.size, level:currentLevel) // where current level has been set to one of the levels
    self.view?.presentScene(gameScene)
}

The GameScene knows the currentLevel but how can I let GameOverScene know this value without creating an instance of the gameScene?

Upvotes: 1

Views: 54

Answers (1)

Charlie
Charlie

Reputation: 1289

You need to set a global string variable on your view controller that represents your GameOverScene. What you will need to do is set the value of this variable when you segue to that screen.

1.) You will need to name the segue (by clicking on it in the storyboard) with an identifier, in this example, "GameOverSegue".

2.) Add a prepareforsegue: method that checks the segue identifier and then sets the level on the view controller for GameOver:

override func prepareForSegue(segue: UIStoryboardSegue!, sender: AnyObject!) {
//check to make sure it is the game over segue being called
if (segue.identifier == "GameOverSegue") {
//set the gameOverVC variable as an instance of the GameOverViewController
    if let gameOverVC: GameOverViewController = segue.destinationViewController as? GameOverViewController {
//set the variable on that vc to be the value of the currentLevel string
                gameOverVC.level = currentLevel
        }
    }
}

3.) Wherever you want to programmatically call a segue, you use this code:

self.performSegueWithIdentifier("GameOverSegue", sender: self)

Upvotes: 2

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