在swift文件之间共享一个变量

Question

说明

我的问题很简单：如何在GameScene上打印GameViewController的变量？

代码

我在下面创建了这段代码，因此更容易理解。

GameScene.swift

import SpriteKit

class GameScene: SKScene {

    var variable = Int()

    override func didMoveToView(view: SKView) {
        /* Setup your scene here */

        variable = 50
    }

    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {

        NSNotificationCenter.defaultCenter().postNotificationName("calledFromGameSceneVC", object: nil)
    }
}

GameViewController.swift

import UIKit
import SpriteKit

class GameViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Set view size.
        let scene = GameScene(size: view.bounds.size)

        // Configure the view.
        let skView = view as! SKView
        skView.showsFPS = true
        skView.showsNodeCount = true

        /* Sprite Kit applies additional optimizations to improve rendering performance */
        skView.ignoresSiblingOrder = true

        /* Set the scale mode to scale to fit the window */
        scene.scaleMode = .ResizeFill

        skView.presentScene(scene)

        //------------------------------//

        //Register observer
        NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(GameViewController.calledFromGameScene), name: "calledFromGameSceneVC", object: nil)
    }

    func calledFromGameScene(){

        //Print variable
        let scene = GameScene(size: view.bounds.size)
        print("My variable from GameScene is: ", scene.variable)
    }
}

对不起，简要说明。

提前致谢，
路易斯。

Answer 1

您尝试实现的对象间通信类型可能最好通过使用协议的委派模式来解决：

<强> GameScene.swift

import SpriteKit

protocol GameSceneDelegate {
    func calledFromGameScene(scene: GameScene)
}

class GameScene: SKScene {

    var variable = Int()

    var gameDelegate: GameSceneDelegate?

    override func didMoveToView(view: SKView) {
        /* Setup your scene here */

        variable = 50
    }

    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {    
        gameDelegate?.calledFromGameScene(self)
    }
}

<强> GameViewController.swift

class GameViewController: UIViewController, GameSceneDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Set view size.
        let scene = GameScene(size: view.bounds.size)

        // Configure the view.
        let skView = view as! SKView
        skView.showsFPS = true
        skView.showsNodeCount = true

        /* Sprite Kit applies additional optimizations to improve rendering performance */
        skView.ignoresSiblingOrder = true

        /* Set the scale mode to scale to fit the window */
        scene.scaleMode = .ResizeFill


        /* Set the delegate */
        scene.gameDelegate = self

        skView.presentScene(scene)
    }

    func calledFromGameScene(scene:GameScene){
        //Print variable
        print("My variable from GameScene is: ", scene.variable)
    }
}

请注意，您不能在delegate上使用属性名称GameScene，因为SKScene已经拥有delegate属性