Importance / Effectiveness of skView.ignoreSiblingOrder in Swift?

How important / efficient is it to execute skView.ignoreSiblingOrder = true

when initializing a scene?

I have now set to true, but for some reason, when I run my GameScene from my MainMenu scene, it loads a background file in front of my character (even if the backgound code comes first), but it fixes when I die and go back to the main menu and then load another game scene. To avoid this problem, I made a boolean that basically determines when I've played more than one game. It works right now but is very ugly and I'm sure there is a better way.

code: (In contactsBegan)

                    let skView = self.view as SKView!
                    skView.showsFPS = true
                    skView.showsNodeCount = true
                    if spriteNode.name == "StartButton"
                    {


                        /* Sprite Kit applies additional optimizations to improve rendering performance */

                        //sets ignoreSiblingOrder to false the first game because of XCode Glitch where background was rendering over player for some reason
                        skView.ignoresSiblingOrder = false
                        if(Game){
                            skView.ignoresSiblingOrder = true
                        }

                        if let scene = GameScene.unarchiveFromFile("GameScene") as? GameScene
                        {
                            skView.presentScene(scene)
                            /* Set the scale mode to scale to fit the window */
                            scene.scaleMode = .AspectFill

                        }

      

        
        
        
      

    

GameSceneCode:

override func didMoveToView(view: SKView)
{
    TheGame = SKNode()
    self.addChild(TheGame)

    createSky()
    createGround()
    addFireButton()
    addJumpButton()
    addHero(view)       

}

      

        
        
        
      

    

To recap, for some reason the first game I play the background returns after (so over) my hero and buttons, even if the function createGround()

works after. Following are the following functions.

func addHero(view: SKView){
    //initializes our hero and sets his initial texture to running1
    hero = SKSpriteNode(texture: heroAtlas.textureNamed("10Xmini_wizard"))
    hero.xScale = 0.4
    hero.yScale = 0.4
    hero.position = CGPointMake(frame.width / 4.0, frame.height / 4.0)

    //creates some CG values for the hero to be used in its physics definitions
    let heroSize = CGSizeMake(hero.size.width, hero.size.height)
    let heroCenter = CGPointMake(hero.position.x/2, hero.position.y/2)
    self.addChild(hero);

}

func createGround()
{
    let groundTexture = SKTexture(imageNamed: "bg")
    groundTexture.filteringMode = .Nearest

    let moveGroundSprite = SKAction.moveByX(-groundTexture.size().width * 2.0, y: 0, duration: NSTimeInterval(0.01 * groundTexture.size().width * 1.0))
    let resetGroundSprite = SKAction.moveByX(groundTexture.size().width * 2.0, y: 0, duration: 0.0)
    let moveGroundSpritesForever = SKAction.repeatActionForever(SKAction.sequence([moveGroundSprite, resetGroundSprite]))

    for var i:CGFloat = 0; i < 2.0 + self.frame.size.width / (groundTexture.size().width * 2.0); ++i
    {
        let sprite = SKSpriteNode(texture: groundTexture)
        sprite.physicsBody = SKPhysicsBody(rectangleOfSize: CGSize(width: groundTexture.size().width, height: frame.height/8))
        sprite.physicsBody?.dynamic = false
        sprite.physicsBody?.restitution = 0
        sprite.setScale(2.0)
        sprite.position = CGPointMake(i * sprite.size.width, sprite.size.height / 2.0)
        sprite.runAction(moveGroundSpritesForever)
        TheGame.addChild(sprite)
    }
}