Swift 变量不保值或以某种方式重置自身

debugcn 发表于 Dev

加勒特

我正在尝试在具有与不同事物相关联的不同分值的游戏中保持分数。用户必须触摸游戏中的东西才能获得积分。然而，分数没有被准确计算。

我已经确定与游戏中每个元素相关联的分数正确存储在一个名为ballValue. 该变量currentScore用于保存分数，然后我使用 aSKLabelNode来显示currentScore.

currentScore初始化为 0 值，并ballValue在用户触摸球时使用其当前值进行更新。

更新以显示代码和上下文

class ChallengeScene: SKScene, GKGameCenterControllerDelegate {

    // MARK: Ball Data
    var randomBallType : Int = 0
    var ballValue : Int = 0

    // MARK: HUD
    var scoreLabel = SKLabelNode(fontNamed: "Impact")
    var timeLabel = SKLabelNode(fontNamed: "Impact")

    var currentScore : Int = 0 {
        didSet {
            self.scoreLabel.text = "\(self.currentScore)"
            GameHandler.sharedInstance.score = currentScore
        }
    }

    // MARK: Initial Setup
    func createHUD() {
    ... UNRELATED HUD STUFF...
        currentScore = 0
    }

    // MARK: Gameplay Setup
    func createBall(forTrack track: Int) {
        setupTracks()

        randomBallType = GKRandomSource.sharedRandom().nextInt(upperBound: 9)

        switch randomBallType {
        case 0:
            player = SKSpriteNode(imageNamed: "blueOne")
            ballSpeed = 0.008
            ballValue = 1
        case 1:
            player = SKSpriteNode(imageNamed: "minusThree")
            ballSpeed = 0.008
            ballValue = -3
        case 2:
            player = SKSpriteNode(imageNamed: "minusFive")
            ballSpeed = 0.008
            ballValue = -5
        case 3:
            player = SKSpriteNode(imageNamed: "purpleThree")
            ballSpeed = 0.008
            ballValue = 3
        case 4:
            player = SKSpriteNode(imageNamed: "greenFive")
            ballSpeed = 0.008
            ballValue = 5
        case 5:
            player = SKSpriteNode(imageNamed: "blackTen")
            ballSpeed = 0.008
            ballValue = 10
        default:
            player = SKSpriteNode(imageNamed: "blueOne")
            ballSpeed = 0.008
            ballValue = 1
        }

        player?.name = "BALL"
        player?.size = CGSize(width: 100, height: 100)
        player?.physicsBody?.linearDamping = 0

        ...UNRELATED BALL STUFF...

        self.addChild(player!)
    }

    // MARK: Overrides
    override func didMove(to view: SKView) {

        createHUD()
        launchGameTimer()

        self.run(SKAction.repeatForever(SKAction.sequence([SKAction.run {
            self.createBall(forTrack: self.track)
            }, SKAction.wait(forDuration: 1)])))

    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        for touch in touches {
            let location = touch.location(in: self)
            let node = self.nodes(at: location).first

            if node?.name == "BALL" {
                currentScore = currentScore + ballValue
                node?.removeFromParent()
            }
        }

    }


    override func update(_ currentTime: TimeInterval) {

        // GAME TIMER RELATED STUFF

    }
}

我想我知道问题发生在哪里（在触摸覆盖中），我只是不明白为什么会发生。如果你能提供帮助，那就太棒了

罗伯梅奥夫

您只有一个ballValue属性。每次生成一个新球时，您都会ballValue为新创建的球设置适当的值。其他所有现有的球呢？触摸它们中的任何一个也同样值得ballValue。

当触球时，您需要知道触球的正确值，该值可能与最近创建的球的值不同。您可能想要做的是创建一个SKSpriteNode代表球的子类，并拥有自己的价值：

class BallNode: SKSpriteNode {
    let value: Int

    init(imageName: String, speed: CGFloat, value: Int) {
        let texture = SKTexture(imageNamed: imageName)
        self.value = value
        super.init(texture: texture, color: .init(white: 1, alpha: 0), size: texture.size())
        self.speed = speed
    }

    required init(coder decoder: NSCoder) { fatalError() }
}

像这样创建球：

func createBall(forTrack track: Int) {

// 设置跟踪（）

    randomBallType = GKRandomSource.sharedRandom().nextInt(upperBound: 9)

    let ball: BallNode
    switch randomBallType {
    case 0: ball = BallNode(imageNamed: "blueOne", speed: 0.008, value: 1)
    case 1: ball = BallNode(imageNamed: "minusThree", speed: 0.008, value: -3)
    case 2: ball = BallNode(imageNamed: "minusFive", speed: 0.008, value: -5)
    // etc.
    }

    ball.name = "BALL"
    ball.size = CGSize(width: 100, height: 100)
    ball.physicsBody?.linearDamping = 0

    // ...UNRELATED BALL STUFF...

    self.addChild(ball)
}

然后，为了处理触球，使用触球的值来更新分数：

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    for touch in touches {
        let location = touch.location(in: self)
        if let ball = self.nodes(at: location).flatMap({ $0 as? BallNode }).first {
            currentScore += ball.value
            ball.removeFromParent()
        }
    }
}

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