如何在iOS SpriteKit模板中重命名默认场景？

我对Swift和iOS开发都是新手。

我一直在开发基于Apple SpriteKit（与GameplayKit集成）模板的游戏。

一切正常，直到我将GameScene.swift和GameScene.sks重命名为MapMainScene.swift和MapMainScene.sks。我确保在GameViewController.swift中更改此代码：

override func viewDidLoad() {
    super.viewDidLoad()

    // Load 'GameScene.sks' as a GKScene. This provides gameplay related content
    // including entities and graphs.
    if let scene = GKScene(fileNamed: "GameScene") {

        // Get the SKScene from the loaded GKScene
        if let sceneNode = scene.rootNode as! GameScene? {

            // Copy gameplay related content over to the scene
            sceneNode.entities = scene.entities
            sceneNode.graphs = scene.graphs

            // Set the scale mode to scale to fit the window
            sceneNode.scaleMode = .aspectFill

            // Present the scene
            if let view = self.view as! SKView? {
                view.presentScene(sceneNode)

                view.ignoresSiblingOrder = true

                view.showsFPS = true
                view.showsNodeCount = true
            }
        }
    }
}

至：

override func viewDidLoad() {
    super.viewDidLoad()

    // Load 'MainMapScene.sks' as a GKScene. This provides gameplay related content
    // including entities and graphs.
    if let scene = GKScene(fileNamed: "MainMapScene") {

        // Get the SKScene from the loaded GKScene
        if let sceneNode = scene.rootNode as! MainMapScene? {

            // Copy gameplay related content over to the scene
            sceneNode.entities = scene.entities
            sceneNode.graphs = scene.graphs

            // Set the scale mode to scale to fit the window
            sceneNode.scaleMode = .aspectFill

            // Present the scene
            if let view = self.view as! SKView? {
                view.presentScene(sceneNode)

                view.ignoresSiblingOrder = true

                view.showsFPS = true
                view.showsNodeCount = true
            }
        }
    }
}

我还更改了以下内容Gamescene.swift：

class GameScene: SKScene {
    // Some code
}

为此MainMapScene.swift：

class MainMapScene: SKScene {
    // Some code
}

但该应用在启动时崩溃。控制台的输出显示：

2016-07-21 16:29:35.593592 MyGame[10656:1944648] [User Defaults] CFPrefsPlistSource<0x6080000e5e00> (Domain: kCFPreferencesAnyApplication, User: kCFPreferencesCurrentUser, ByHost: No, Container: (null)) is waiting for writes to complete so it can determine if new data is available
2016-07-21 16:29:35.603729 MyGame[10656:1944648] [FenceWorkspace] creating a CA fence port (5d13)
2016-07-21 16:29:35.638 MyGame[10656:1944648] *** Terminating app due to uncaught exception 'NSInvalidUnarchiveOperationException', reason: '*** -[NSKeyedUnarchiver decodeObjectForKey:]: cannot decode object of class (GameScene) for key (root); the class may be defined in source code or a library that is not linked'
*** First throw call stack:

因此，看起来GameScene我的项目中仍然有对某处的引用，但是我已经在项目范围内进行了搜索，因此找不到GameScene任何地方。

我敢肯定，这确实很简单。我是否需要在情节提要编辑器中更改插座或其他内容？我也可以通过尝试GameScene在新项目中更改名称来重现此问题，因此我知道这不是我的项目所特有的。