收到错误。试图在Sprite Kit游戏中制作主菜单

Question

我正在逐步关注这个问题How to create a main menu for a spritekit game made with swift in xcode?。

我创建了一个SKScene和一个Cocoa Touch Class，并在Cocoa Touch Class中插入了这个：

SELECT value,
       COALESCE(lag(new_value) OVER () * value, 10) AS new_value
FROM table

现在在GameViewController文件中我试图从import SpriteKit class MenuScene: SKScene { var playButton = SKSpriteNode() let playButtonTex = SKTexture(imageNamed: "play") override func didMove(to view: SKView) { playButton = SKSpriteNode(texture: playButtonTex) playButton.position = CGPoint(x: frame.midX, y: frame.midY) self.addChild(playButton) } override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) { if let touch = touches.first { let pos = touch.location(in: self) let node = self.atPoint(pos) if node == playButton { if let view = view { let transition:SKTransition = SKTransition.fade(withDuration: 1) let scene:SKScene = GameScene(size: self.size) self.view?.presentScene(scene, transition: transition) } } } } } 更改为if let scene = GameScene.unarchiveFromFile("GameScene") as?。

但是我一直收到这个错误。请帮助！

这是我的代码

if let scene = MenuScene.unarchiveFromFile("MenuScene") as? Menu Scene