问景观游戏使用斯威夫特在xcode 6

EN

 override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func viewDidLayoutSubviews() {

        if let scene = GameScene.unarchiveFromFile("GameScene") as? GameScene {
            // Configure the view.
            let skView = self.view as SKView

            var boo = Bool();
            boo = true;
            skView.showsFPS = boo;
            skView.showsNodeCount = boo;
            skView.showsPhysics = boo;

            skView.showsFPS = true
            skView.showsNodeCount = true


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

            /* Set the scale mode to scale to fit the window */
            scene.scaleMode = .AspectFill

            skView.presentScene(scene)
        }
    }

var hero = SKSpriteNode(color: UIColor.redColor(), size: CGSize(width: 40, height: 40));
        let hero_body = SKPhysicsBody(rectangleOfSize: hero.size);
        hero.position = CGPoint(x:self.frame.size.width/2, y:50);

        self.addChild(hero)

-self.frame.size.height/2 + hero.size.height/2