sprite-kit - 在 SpriteKit 错误中向状态机添加动画

Question

大家好，我正在尝试将此动画添加到我的游戏状态中，但出现此错误

覆盖 func didEnterWithPreviousState(previousState: GKState?) {

    Ninja_Run = self.childNodeWithName("Ninja_Run") as! SKSpriteNode //ERROR HERE:RunningState' has no member 'childNodeWithName'
    var frames: [SKTexture] = []
    for i in 0 ..< 9 {
        let tex:SKTexture = SKTexture(imageNamed: "Run__00\(i).png")
        frames.append(tex)
    }
    Ninja_Run!.runAction(SKAction.repeatActionForever(SKAction.animateWithTextures(frames, timePerFrame: 0.055)))
    Ninja_Run!.size = CGSize(width: 150, height: 150)

}

Answer 1

如错误所述，GKState类没有任何名为childNodeWithName.

Answer 2

您忘记引用GameScene文件

代替：

Ninja_Run = self.childNodeWithName("Ninja_Run") as! SKSpriteNode

和：

let scene = GameScene(fileNamed:"GameScene") //Or everywhere is your sprite
Ninja_Run = scene.childNodeWithName("Ninja_Run") as! SKSpriteNode