ios - 不能在子类中运行 SKAction.runBlock

Question

我是 Swift 的新手，但我在类和继承方面遇到了麻烦。我有一个名为 Bunny 的类，其中包含一些代码，包括 SKAction。当我将在 Bunny 中找到的代码放入我的 GameScene 类时，它工作正常，但是，当我尝试运行它时，当它在 Bunny 类中时，从我的 GameScene 类中它不起作用。

这是 Bunny 类:

import SpriteKit

class Bunny : SKSpriteNode {
    var bunny = SKSpriteNode()
    var moveAndRemove = SKAction()
    var textureAtlas = SKTextureAtlas()
    var textureArray = [SKTexture]()

    func spawnBunnies() {
        let spawn = SKAction.runBlock({
            () in
                self.spawnBunny()
                print("CALLEDBunniesSpawned") // THIS PART IS NOT GETTING CALLED
            })
        let delay = SKAction.waitForDuration(3)
        let spawnDelay = SKAction.sequence([spawn, delay])
        let spawnDelayForever = SKAction.repeatActionForever(spawnDelay)
        self.runAction(spawnDelayForever)
        let distance = CGFloat(self.frame.width + bunny.frame.width)
        let movePipes = SKAction.moveByX(-distance - 200, y: 0, duration: NSTimeInterval(0.009 * distance)) // Speed up pipes
        let removePipes = SKAction.removeFromParent()
        moveAndRemove = SKAction.sequence([movePipes, removePipes])
        print("BunniesSpawned") // THIS PART HERE RUNS
    }

    func spawnBunny() { // I NEED TO TRIGGER THIS PART VIA THE SPAWN = SKAction.runBlock
        print("BunniesSpawned2")
        let randomYGen = CGFloat(arc4random_uniform(UInt32(self.frame.height - 80)))
        textureAtlas = SKTextureAtlas(named: "Bunnies")
        for i in 1...textureAtlas.textureNames.count {
            var name = "Bunny\(i).png"
            textureArray.append(SKTexture(imageNamed: name))
        }
        bunny = SKSpriteNode(imageNamed: textureAtlas.textureNames[5] as! String)
        bunny.position = CGPoint(x: self.frame.width + bunny.frame.width / 2, y: randomYGen)
        bunny.setScale(0.5)
        bunny.runAction(moveAndRemove)
        self.addChild(bunny)
        bunny.runAction(SKAction.repeatActionForever(SKAction.animateWithTextures(textureArray, timePerFrame: 0.1)))
    }
}

这是我的 GameScene 类，我在其中尝试从 Bunny 调用函数:

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
   /* Called when a touch begins */
    if gameStarted == false {
        gameStarted = true

        var bun = Bunny()
        bun.spawnBunnies()

    } else {

    }

Answer 1

正如 crashoverride777 所说，您在 touchesBegan 中创建的原始 Bunny 永远不会添加到场景中。如果它不是场景的一部分，它永远不会运行您正在设置的任何操作。

var bun = Bunny()
self.addChild(bun)
bun.spawnBunnies()

此外，在 spawnBunnies 中，您将新生成的 Bunny 添加为生成它的 Bunny 的子项。这只兔子从场景中移除，因此新生成的兔子(它的 child )也被移除。

self.addChild(bunny) 应该是 parent?.addChild(bunny)。它可能还需要移动到 bunny.runAction(moveAndRemove) 行之上。