SpriteKit: White Background As SKScene

Question

I have a Swift project including the SpriteKit framework. When I run the program without anything on it, the screen is black and the node counter at 1. The Main.storyboard is entirely white and the class in it is set to SKView. Is the node counter wrong? Shouldn't it be 0 and why is the background black instead of white?

Maybe some necessary code where the mistake is:

class GameViewController: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()

    let scene = GameScene() // class GameScene is a subclass of SKScene

    let skView = self.view as! SKView
    skView.showsFPS = true
    skView.showsNodeCount = true

    /* Sprite Kit applies additional optimizations to improve rendering performance */
    skView.ignoresSiblingOrder = false

    /* Set the scale mode to scale to fit the window */
    scene.scaleMode = .AspectFill
    scene.size = skView.bounds.size
    scene.anchorPoint = CGPointMake(0,0);
    skView.presentScene(scene)
}

Answer 1

Node counter is right. First of all you set the node couter for skView object with this line of code:

skView.showsNodeCount = true

Then you add object to this skView with this line:

skView.presentScene(scene)

This action set node counter to 1. Your scene is this single node on skView

About black screen: this is default background color for scene, you can change it with this code for example:

scene.backgroundColor = UIColor.redColor()

And your scene will be red