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SKAction我正在使用 SpriteKit 制作游戏，其中我有一个节点使用以下序列从屏幕的左侧到右侧反复来回移动：

func move(){
    let recursive = SKAction.sequence([
        SKAction.moveByX(frame.size.width/2.8, y: 0, duration: NSTimeInterval(4),
        SKAction.moveByX(-frame.size.width/2.8, y: 0, duration: NSTimeInterval(4),
        SKAction.runBlock({self.move()})])
        doc.runAction(recursive, withKey: "move")
}

节点是SKTexture，我使用的是名为 WalkRight 的图集。我想要做的是，当SKAction.moveByX(-frame.size.width/2.8, y: 0, duration: NSTimeInterval(4)运行时，我想将节点的纹理更改为我称为 WalkLeft 的不同图集。我不知道如何在我的序列中运行一个动作，让我改变节点的纹理。

我用于添加纹理的代码：

 //In class
var docWalkingFrames: [SKTexture]!

 // general runAction method to make doc walk.
func walkingDoc() {
    doc.runAction(SKAction.repeatActionForever(SKAction.animateWithTextures(docWalkingFrames,timePerFrame: 0.3,resize: false,restore: true)),withKey:"walkingInPlaceDoc")
}

//In didMoveToView
  //doc animation walk right
    let docAnimatedAtlas = SKTextureAtlas(named: "WalkRight")
    var walkFrames = [SKTexture]()
    let numImages = docAnimatedAtlas.textureNames.count
    for var i=1; i<=numImages; i++ {
        let docTextureName = "docRight\(i)"
        walkFrames.append(docAnimatedAtlas.textureNamed(docTextureName))
    }

    docWalkingFrames = walkFrames

    let firstFrame = docWalkingFrames[0]
    doc = SKSpriteNode(texture: firstFrame)
    doc.position = CGPoint(x:self.frame.size.width/3.1, y:self.frame.size.height/2)
    doc.size = CGSize(width: 220, height: 470)
    doc.zPosition = 2
    addChild(doc)

walkingDoc()
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