Sprite Kit Scenes and SKNode Positioning - Beginning Swift Games Development for iOS - page 19

3. Inside the GameViewController.viewDidLoad() , downcast the

UIView to an SKView and set the showFPS property to true .

let skView = view as SKView
skView.showsFPS = true

4. Create an instance of the SKScene named GameScene , passing it its size

in the constructor and setting the scaleMode property.

scene = GameScene(size: skView.bounds.size)
scene.scaleMode = .AspectFill

5. Inside the init() of the GameScene , add the SKSpriteNode objects

to the scene.

backgroundNode = SKSpriteNode(imageNamed:
"Background")
backgroundNode!.anchorPoint = CGPoint(x: 0.5, y:
0.0)
backgroundNode!.position = CGPoint(x: size.width
/ 2.0, y: 0.0)
addChild(backgroundNode!)
playerNode = SKSpriteNode(imageNamed: "Player")
playerNode!.position = CGPoint(x: size.width
/ 2.0, y: 80.0)
addChild(playerNode!)

6. Present the complete scene in the GameViewControl-

ler.viewDidLoad() method.

skView.presentScene(scene)

At this point, you have a complete scene with a complete node tree. You can always add
more nodes as the game progresses, but these are the basic steps that you will complete
whenever you create a new SKScene .

The SKScene Rendering Loop