gameViewController背景颜色无法更改

Question

在spriteKit下运行的应用程序。几天前，gameScene在加载gameViewController后加载。今天，我改变了加载动作，只有在单击“开始”按钮时才加载gameScene，这意味着gameScene背景颜色是不可见的，我需要为gameViewController设置背景颜色。这是一项非常简单的任务，已经完成了很多次  之前，但它坚持浅灰色（下图）。

不能在spriteKit下更改gameViewController背景颜色吗？

我必须改变gameScene背景颜色吗？

    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.backgroundColor = .green

        // .......
    }

  @IBAciton func loadGameView() {
        if let view = self.view as! SKView? {
            // Load the SKScene from 'GameScene.sks'
            // if let scene = SKScene(fileNamed: "GameScene") {
            if let scene = GameScene(fileNamed: "GameScene") {
                scene.viewController = self
                scene.size = self.view.frame.size
                scene.scaleMode = .aspectFill
                // Present the scene
                view.presentScene(scene)

            }

            view.ignoresSiblingOrder = false
            view.showsFPS = false
            view.showsNodeCount = false
            view.showsDrawCount = false


        }

    }

Answer 1

    if let scene = GameScene(fileNamed: "GameScene") {
            scene.viewController = self
            scene.size = self.view.frame.size
            scene.scaleMode = .aspectFill

            //ADD THIS
            scene.color = .green
            scene.colorBlendFactor = 1

            // Present the scene
            view.presentScene(scene)

     }