How i get back to old scene in SpriteKit? - objective-c

Question

How can I go to old scene in SpriteKit ( in Swift ) ? I am in scene1 , i paused it and i move to scene 2 and I want to get back to scene1 and i to resume it . I don't want to recreate it again .
Thanks.
EDIT :
So , I tried this :
In secondScene class i put a oldScene SKScene property and a computed setOldScene property:
class SecondScene: SKScene {
var oldScene:SKScene?
var setOldScene:SKScene? {
get { return oldScene }
set { oldScene = newValue }
}
init(size: CGSize) {
super.init(size: size)
/* Setup my scene here */
}}
And then , in FirstScene class ( where i have ONE moving ball ) , in touchBegan method i have this
override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
/* Called when a touch begins */
for touch: AnyObject in touches {
let location = touch.locationInNode(self)
if(self.view.scene.paused) {
self.view.scene.paused = false
}
else {
self.view.scene.paused = true
}
var secondScene = SecondScene(size: self.frame.size)
secondScene.setOldScene = self.scene
if !transition { self.view.presentScene(secondScene, transition: SKTransition.doorsOpenHorizontalWithDuration(2)) ; transition = true }
}
}
But , when i call self.view.presentScene(oldScene) in SecondScene class i move yo first class and i have TWO balls that moving :-??
I can't use class variable , Xcode not suport yet .

Answer 1

I solved this issue by having a public property on the second scene.
And then using that to present the first scene.
So in the First Scene, when you want to show the second scene....
if let scene = SKScene(fileNamed: "SecondScene") as! SecondScene?
{
scene.parentScene = self
self.view?.presentScene(scene)
}
This following code is in the SecondScene.
When ready to return to the first scene, just call the method showPreviousScene()...
public var parentScene: SKScene? = nil
private func showPreviousScene()
{
self.view?.presentScene(parentScene!)
}

Answer 2

You will have to keep a reference to your old scene around, and then when you want to move back to it, simply call
skView.presentScene(firstScene)
on your SKView instance.
There are several ways to keep a reference to your class around. You could use a Singleton, or simply a class with a class type property to store the reference and access it from anywhere.