从AppDelegate调用GameScene方法(Swift 3，SpriteKit，Xcode 8) [英] Call GameScene method from AppDelegate (Swift 3, SpriteKit, Xcode 8)

问题描述

我正在使用Spritekit和swift 3来创建游戏，我的问题是当我尝试从applicationWillResignActive(_ application: UIApplication)方法中的AppDelegate文件调用GameScene类(SKScene的子类)中存在的pauseGame()方法时./p>

我已经尝试实例化GameScene类，然后以这种方式在AppDelegate文件中调用该方法，尽管没有编译器错误也不起作用:

func applicationWillResignActive(_ application: UIApplication) {

    if let gameScene = GameScene(fileNamed: "GameScene") {

        gameScene.pauseGame()
    }
}

我该如何解决?预先感谢.

解决方案

您正在创建GameScene的新实例. 要暂停现有实例，您需要在AppDelegate中添加对它的引用.

一种更好的解决方案，它可以注册GameScene类以在应用程序进入后台时接收通知.这是将这些类与AppDelegate耦合的不错选择.

在您的GameScene类中，将其添加到viewDidLoad()函数中:

let app = UIApplication.shared

//Register for the applicationWillResignActive anywhere in your app.
NotificationCenter.default.addObserver(self, selector: #selector(GameScene.applicationWillResignActive(notification:)), name: NSNotification.Name.UIApplicationWillResignActive, object: app)

将此功能添加到GameScene类中以对收到的通知做出反应:

func applicationWillResignActive(notification: NSNotification) {
     pauseGame()
}

I am using Spritekit and swift 3 for create a game, my problem is when I try to call my pauseGame() method, present in my GameScene class (subclass of SKScene), from AppDelegate file within applicationWillResignActive(_ application: UIApplication) method.

I already try to instantiate GameScene class and then call the method in my AppDelegate file in this way, although there is no compiler error it doesn't work:

func applicationWillResignActive(_ application: UIApplication) {

    if let gameScene = GameScene(fileNamed: "GameScene") {

        gameScene.pauseGame()
    }
}

How can I resolve this? Thanks in advance.

解决方案

You are creating a new instance of your GameScene. To pause the existing instance you need to add a reference to it in the AppDelegate.

The better solution it to register the GameScene class to receive notifications when the app goes into the background. This is a good alternative to coupling these classes with the AppDelegate.

In your GameScene class add this in the viewDidLoad() function:

let app = UIApplication.shared

//Register for the applicationWillResignActive anywhere in your app.
NotificationCenter.default.addObserver(self, selector: #selector(GameScene.applicationWillResignActive(notification:)), name: NSNotification.Name.UIApplicationWillResignActive, object: app)

Add this function to the GameScene class to react to the received notification:

func applicationWillResignActive(notification: NSNotification) {
     pauseGame()
}

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