动作完成时调用 func？

Question

首先，感谢您抽出宝贵时间。我有一个相当简单的问题要解决，但似乎无法弄清楚。

我正在制作一款塔防游戏，我希望当敌人到达目的地时生命条会减少。我想这一定很简单，就像在序列中添加另一个动作，调用一个可以减少生命点数的方法，但我还没有找到方法。任何帮助都会非常有益。

        let enemy1 = SKSpriteNode(imageNamed: "magSquare.png")
        enemy1.position = startPoint

        let step1 : SKAction = SKAction.moveTo(firstTurn, duration: duration)
        let step2 : SKAction = SKAction.moveTo(secondTurn, duration: duration)
        let step3 : SKAction = SKAction.moveTo(thirdTurn, duration: duration)
        let step4 : SKAction = SKAction.moveTo(fourthTurn, duration: duration)
        let step5 : SKAction = SKAction.moveTo(fifthTurn, duration: duration)
        let step6 : SKAction = SKAction.removeFromParent()
        //let step7 : SKAction = SKAction.** call method **

        enemy1.runAction(SKAction.sequence([step1, step2, step3, step4, step5, step6]))

        self.addChild(enemy1)

Answer 1

let step7 = SKAction.runBlock({ self.yourfunc() })

动作完成时调用 func？

call func when action completes?

ios

sprite-kit

skaction

swift