问SpriteKit设备方向更改导致SKLabelNode失真迅速

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class GameViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        let scene = GameScene(size:self.view.bounds.size)
        scene.scaleMode = .resizeFill
        (self.view as! SKView).presentScene(scene)
    }

    override var shouldAutorotate: Bool {
        return true
    }

    override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
        if UIDevice.current.userInterfaceIdiom == .phone {
            return .allButUpsideDown
        } else {
            return .all
        }
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Release any cached data, images, etc that aren't in use.
    }

    override var prefersStatusBarHidden: Bool {
        return true
    }
}

class GameScene: SKScene {
    var currentNode: CustomNode!

    override func didMove(to view: SKView) {
        self.backgroundColor = SKColor.white
        transitionToScene(sceneType: .Menu)
    }
    override func didChangeSize(_ oldSize: CGSize) {
        currentNode?.layout()
    }
    func transitionToScene(sceneType: SceneTransition) {
        switch sceneType {
        case .Menu:
            currentNode?.dismissWithAnimation(animation: .Right)
            currentNode = MenuNode(gameScene: self)
            currentNode.presentWithAnimation(animation: .Right)

        case .Scores:
            currentNode?.dismissWithAnimation(animation: .Left)
            currentNode = ScoresNode(gameScene: self)
            currentNode.presentWithAnimation(animation: .Left)

        default: fatalError("Unknown scene transition.")
        }
    }
}

class CustomNode: SKNode {
    weak var gameScene: GameScene!

    init(gameScene: GameScene) {
        self.gameScene = gameScene
        super.init()
    }
    func layout() {}
    func presentWithAnimation(animation:Animation) {
        layout()
        let invert: CGFloat = animation == .Left ? 1 : -1
        self.position = CGPoint(x: invert*gameScene.size.width, y: 0)
        gameScene.addChild(self)
        let action = SKAction.move(to: CGPoint(x: 0, y: 0), duration: 0.3)
        action.timingMode = SKActionTimingMode.easeInEaseOut
        self.run(action)
    }
    func dismissWithAnimation(animation:Animation) {
        let invert: CGFloat = animation == .Left ? 1 : -1
        self.position = CGPoint(x: 0, y: 0)
        let action = SKAction.move(to: CGPoint(x: invert*(-gameScene.size.width), y: 0), duration: 0.3)
        action.timingMode = SKActionTimingMode.easeInEaseOut
        self.run(action, completion: {self.removeFromParent()})
    }
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}


class MenuNode: CustomNode {
    var label: SKLabelNode
    var container: SKSpriteNode

    override func layout() {
        container.position = CGPoint(x: gameScene.size.width/2.0, y: gameScene.size.height/2.0)
    }
    override init(gameScene: GameScene) {
        label = SKLabelNode(text: "Menu Scene")
        label.horizontalAlignmentMode = .center
        label.verticalAlignmentMode = .center
        container = SKSpriteNode(color: UIColor.black, size: CGSize(width: 200, height: 200))
        container.addChild(label)
        super.init(gameScene: gameScene)
        self.addChild(container)
        self.isUserInteractionEnabled = true
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        self.gameScene.transitionToScene(sceneType: .Scores)
    }
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

class ScoresNode: CustomNode {
    var label: SKLabelNode
    var container: SKSpriteNode

    override func layout() {
        container.position = CGPoint(x: gameScene.size.width/2.0, y: gameScene.size.height/2.0)
    }
    override init(gameScene: GameScene) {
        label = SKLabelNode(text: "Scores Scene")
        label.horizontalAlignmentMode = .center
        label.verticalAlignmentMode = .center
        container = SKSpriteNode(color: UIColor.black, size: CGSize(width: 200, height: 200))
        container.addChild(label)
        super.init(gameScene: gameScene)
        self.addChild(container)
        self.isUserInteractionEnabled = true
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        self.gameScene.transitionToScene(sceneType: .Menu)
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

enum SceneTransition{
    case Menu, Scores
}
enum Animation {
    case Left, Right, None
}

viewWillTransitionToSize...