swift SpriteKit : Use of unresolved identifier "player"?

Question

当我尝试对 Sprite 运行操作时，我在 didMoveToView 中设置了一个常量，我在 touchesBegan 函数中使用相同的名称并得到“使用未解析的标识符:“玩家”错误。我有另一个游戏，我有完全相同的东西并且它运行完美。需要帮助!这是我的代码:

import SpriteKit

class GameScene: SKScene {

    var movingGround : MCTGround!
    var fruitGenerator : MCTFruitGen!
    var cloudGenerator: MCTCloudGen!

    var isStarted = false

    override func didMoveToView(view: SKView) {

        let player = SKSpriteNode(imageNamed: "koala_idle")
        player.position = CGPointMake(95, 150)
        addChild(player)

        backgroundColor = UIColor(red: 159.0/255.0, green: 201.0/255.0, blue: 244.0/255.0, alpha: 1.0)
        movingGround = MCTGround(size: CGSizeMake(view.frame.width, 20))

        movingGround.position = CGPointMake(0, view.frame.size.height / 4)

        addChild(movingGround)

        fruitGenerator = MCTFruitGen(color: UIColor.clearColor(), size: view.frame.size)
        fruitGenerator.position = view.center

        addChild(fruitGenerator)

        let frames = [
            SKTexture(imageNamed: "koala_idle"),
            SKTexture(imageNamed: "koala_walk01"),
            SKTexture(imageNamed: "koala_walk02"),


        ]

        let duration = 1.5 + drand48() * 1.0

        let move = SKAction.animateWithTextures(frames, timePerFrame:0.10)
        let wait = SKAction.waitForDuration(duration)
        let rest = SKAction.setTexture(frames[0])
        let sequence = SKAction.sequence([move, rest])

        player.runAction(SKAction.repeatActionForever(sequence))

        cloudGenerator = MCTCloudGen(color: UIColor.clearColor(), size: view.frame.size)
        cloudGenerator.position = view.center
        addChild(cloudGenerator)
        cloudGenerator.populate(7)
        cloudGenerator.startGeneratingWithSpawnTime(1)
    }


    func start() {
        isStarted = true

        cloudGenerator.startGeneratingWithSpawnTime(1)
    }

    override func touchesBegan(touches: Set<NSObject>, withEvent event:   UIEvent) {
        jumpPlayer()
        movingGround.start()

        fruitGenerator.startGeneratingFruitEvery(1)
    }

    override func update(currentTime: CFTimeInterval) {

    }


    func jumpPlayer() {
        let jumpUpAction = SKAction.moveByX(0, y: 40, duration: 0.5)
        let jumpDownAction = SKAction.moveByX(0, y: -40, duration: 0.5)

        let jumpSequence = SKAction.sequence([jumpUpAction, jumpDownAction])
        player.runAction(jumpSequence) // This is where my error is
    }
}

Answer 1

使player成为类作用域变量(属性)。不要在函数中声明它，而是在更高的级别中声明它。

var player: SKSpriteNode?

override func didMoveToView(view: SKView) {

    player = SKSpriteNode ...

然后通过player?访问它。最安全的方法。