如何检测哪个场景？（迅捷/spritekit/xcode）答案

【问题标题】：how to detect which scene? (swift/spritekit/xcode)如何检测哪个场景？（迅捷/spritekit/xcode）
【发布时间】：2014-11-27 00:48:47
【问题描述】：

我在游戏视图控制器中使用此代码作为我的背景：

    let yourImage = UIImage(named: welkeLevel)
    let imageview = UIImageView(image: yourImage)
    self.view?.addSubview(imageview)

但是我有一个开始（菜单）场景，我不想要这个背景并且仍然出现。

如何检测我在哪个场景（游戏场景/菜单场景等）？

或者还有其他方法吗？

【问题讨论】：

标签： xcode swift background scene

【解决方案1】：

SKScene 是SKNode 的子类。您可以使用 name 属性来执行此操作。只需将Gamescene 或Menuscene 的名称设置为'game' 或'menu'，如下所示：

scene.name = "game"

然后像这样检查属性：

if self.name == "game"{
    //Do something.
    println("game")
} else if self.name == "menu
    //Do something else.
    println("menu")
}

【讨论】：

我把这段代码放在视图控制器还是游戏场景中？谢谢
因为它说 gameviewcontroller 在这行代码中没有名为“name”的成员： if self.name == "game"{
第一个块应该在您的视图控制器中，第二个在实际游戏场景中。如果您需要在视图控制器中使用第二个块，只需将 self 替换为您要检查的场景的引用即可。
我想在我的视图控制器中使用第二个块，但我不知道您将 self 替换为您要检查的场景的引用是什么意思。我想检查场景是否是一个 GameScene，但是如果我将 self.name 更改为 GameScene.name 它会给出错误

【解决方案2】：

I have worked out the same issue with a replay button. I have to identify which scene the user is in and reload the same when user clicks replay button.

1) Add a extension function  to detect current game level

extension SKScene {

    static func sceneWithClassNamed(className: String, fileNamed fileName: String) -> SKScene? {
        if let SceneClass = NSClassFromString("JumperCrab.\(className)") as? SKScene.Type,
            let scene = SceneClass(fileNamed: fileName) {
                return scene
        }
        return nil
    }

    func replayCurrentScene(currentLevelName: String,currentGameSceneIndex:Int)
    {
        GameViewController().getReplayCurrentSceneDetailsToVC(currentLevelName, currentGameSceneIndex: currentGameSceneIndex)
    }
}

2) Call the above extension method in every game scene.

    override func didMoveToView(view: SKView) {
        self.replayCurrentScene( "Round 1", currentGameSceneIndex: 0)
}

3) Set up a similar method at the View Controller.

    func getReplayCurrentSceneDetailsToVC(currentLevelName: String,currentGameSceneIndex:Int)
    {
        NSUserDefaults.standardUserDefaults().setInteger(currentGameSceneIndex, forKey: "LevelInt")
        NSUserDefaults.standardUserDefaults().synchronize()

        NSUserDefaults.standardUserDefaults().setObject(currentLevelName, forKey: "LevelName")
        NSUserDefaults.standardUserDefaults().synchronize()

    }

4)  Create variables 

    //GAME LEVEL
    var gameLevelSceneNameArray = NSArray()
    var currentGameSceneAtVC:String?
    var currentGameSceneIndexAtVC:Int?

5) Make my level list array

  override func viewDidLoad() {
        super.viewDidLoad()

        //Game Scenes
        gameLevelSceneNameArray = ["GameScene","SecondRound","ThirdRound", "FourthRound","FifthRound","SixthRound","SeventhRound", "EighthRound","NinethRound"]
}

6) Apply on the Replay Game button .

    @IBAction func replayButtonClicked(sender: AnyObject) {

    currentGameSceneIndexAtVC =   NSUserDefaults.standardUserDefaults().integerForKey("LevelInt")
    currentGameSceneAtVC = NSUserDefaults.standardUserDefaults().objectForKey("LevelName") as? String

 self.moveToSelectedGameLevel(currentGameSceneAtVC!, gameSceneName: self.gameLevelSceneNameArray[currentGameSceneIndexAtVC!] as! String)

    }

7) Set up a game scene navigation too (using switch case )


func moveToSelectedGameLevel(levelNameString:String, gameSceneName:String)
    {
        let skView = self.view as! SKView
        switch(levelNameString)
        {
        case "Round 1":
            if let gameScene = SKScene.sceneWithClassNamed(gameSceneName, fileNamed: gameSceneName) {
                skView.presentScene(gameScene)
            }
        case "Round 2" :
            if let gameScene = SKScene.sceneWithClassNamed(gameSceneName, fileNamed: gameSceneName) {
                skView.presentScene(gameScene)
            }
        case "Round 3":
            if let gameScene = SKScene.sceneWithClassNamed(gameSceneName, fileNamed: gameSceneName) {
                skView.presentScene(gameScene)
        default:
            print("")
        }
    }

【讨论】：