Question

所以我试图在名为PlayScene的类中的不同文件中引用一个名为high score的变量。我如何在我的GameScene.swift文件中引用该高分。这是我目前的GameScene.swift文件，但是在

行

self.highscoreText.text = "Highscore: \(highscoreshow)

它说highscoreshow是一个未解析的标识符，因为我不知道如何从另一个类引用该变量

import SpriteKit

class GameScene: SKScene {

    let playButton = SKSpriteNode(imageNamed:"play")
    let title = SKSpriteNode(imageNamed: "title")
    let highscoreText = SKLabelNode(fontNamed: "Chalkduster")

    override func didMoveToView(view: SKView) {
        self.playButton.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame))
        self.title.position = CGPointMake(CGRectGetMaxX(self.frame) - 150
            , CGRectGetMaxY(self.frame) - 150)
        self.highscoreText.text = "Highscore: \(highscore)"
        self.highscoreText.fontSize = 42
        self.highscoreText.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame) - 150)
        self.addChild(self.playButton)
        self.addChild(self.title)
        self.addChild(self.highscoreText)
        self.backgroundColor = UIColor(hex: 0x80D9FF)
    }

    override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
        for touch: AnyObject in touches {
            let location = touch.locationInNode(self)
            if self.nodeAtPoint(location) == self.playButton {
                var scene = PlayScene(size: self.size)
                let skView = self.view as SKView
                skView.ignoresSiblingOrder = true
                scene.scaleMode = .ResizeFill
                scene.size = skView.bounds.size
                skView.presentScene(scene)
            }
        }
    }

    override func update(currentTime: CFTimeInterval) {
        /* Called before each frame is rendered */
    }
}

以下是创建和存储高分变量的另一个类中的函数：

func died() {

    var defaults = NSUserDefaults()

    var highscore = defaults.integerForKey("highscore")

    if (score > highscore){

        defaults.setInteger(score, forKey: "highscore")

    }

    var highscoreshow = defaults.integerForKey("highscore")

    if let scene = GameScene.unarchiveFromFile("GameScene") as? GameScene {
        let skView = self.view as SKView
        skView.ignoresSiblingOrder = true
        scene.size = skView.bounds.size
        scene.scaleMode = .AspectFill
        skView.presentScene(scene)
    }
}

Answer 1

好的，有两个问题。

当您尝试访问变量 highscoreshow 时，它可能不存在。
变量highscoreshow只能在方法PlayScene.died（声明它）中访问。

您可以使用NSUserDefaults在两个场景之间共享值highscoreshow。

只需在方法顶部的GameScene中添加此行 didMoveToView

var highscoreshow = NSUserDefaults().integerForKey("highscore")
如果更改高分
，请记住更新NSUserDefaults中的值
NSUserDefaults().setInteger(highscoreshow, forKey: "highscore")
最后请注意，值NSUserDefaults保存在持久存储中。因此，如果您重新启动应用程序或设备，这些值仍然可用。

希望这会有所帮助。

如何在Swift中引用不同类中的另一个变量

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