无法使敌方精灵呈之字形并进行反击 Swift、Spritekit

Question

我正在制作一个 2D 滚动射击游戏。我希望其中一个敌人能够随机移动，他们可以沿着屏幕向下移动，或者以之字形移动。敌人停顿了半秒，此时我希望他们还击。我无法让子弹在正确的位置产生。我的运动正常，敌人会向第一个位置开火，但不会向其他位置开火。

我的任务是在敌人位置生成子弹，然后使用 SKAction 来移动子弹。然而，我为敌人做运动的方式现在阻止了我这样做，但这是我能让运动按照我想要的方式工作的唯一方法。

我随机化了屏幕上敌人的生成位置，然后创建了新的位置供它们移动到，但是我认为当我使用 enemy3.position 稍后尝试生成子弹时，它无法找到敌人的位置因为我的做法。我不知道如何以其他方式做到这一点，因为我花了很长时间才弄清楚这一点。当我尝试了一些不同的事情时，我已经注释掉了我试图用产卵激光做的事情。我不擅长编程，所以我知道有比我更好的方法来做到这一点。任何帮助将不胜感激，谢谢。

这是我的敌人函数

func addEnemy3() {
        
        //Enemy3 Image
        let enemy3 = SKSpriteNode(imageNamed: "Enemy3.png")

        //GameplayKit randomization to spawn enemy across screen size
        let randomEnemy3Position = GKRandomDistribution(lowestValue: -350, highestValue: 350)
        //Randomly spawn enemy3 in different positions
        let position = CGFloat(randomEnemy3Position.nextInt())
        enemy3.position = CGPoint(x: position, y: 700/*self.frame.size.height + enemy3.size.height*/)
        addChild(enemy3)
        
        //To randomly spawn next positions on the x axis
        let position1 = CGFloat(randomEnemy3Position.nextInt())
        let position2 = CGFloat(randomEnemy3Position.nextInt())
        let position3 = CGFloat(randomEnemy3Position.nextInt())
        let position4 = CGFloat(randomEnemy3Position.nextInt())
        
        //Delay enemies
        let delay = SKAction.wait(forDuration: 5)
        
        //Move enemies to next positions randomly on the x axis while moving down the y axis
        let actionMoveOne = SKAction.move(to: CGPoint(x: position, y: 500), duration: 3.0)
        
        let actionMoveTwo = SKAction.move(to: CGPoint(x: position1, y: 200), duration: 3.0)
        
        let actionMoveThree = SKAction.move(to: CGPoint(x: position2, y: -100), duration: 3.0)
        
        let actionMoveFour = SKAction.move(to: CGPoint(x: position3, y: -400), duration: 3.0)
        
        let actionMoveFive = SKAction.move(to: CGPoint(x: position4, y: -600), duration: 3.0)
        
        let wait = SKAction.wait(forDuration: 0.5)
        
        // Remove enemies when finished
        let actionRemove = SKAction.removeFromParent()
        
        enemy3.run(SKAction.sequence([delay, actionMoveOne, wait, actionMoveTwo, wait, actionMoveThree, wait, actionMoveFour, wait, actionMoveFive, actionRemove]), withKey:"enemy3")
        
        
        //Create and position laser
       // let enemyLaser = SKSpriteNode(imageNamed: "EnemyLaser")
        
        //enemyLaser.position = CGPoint(x: position1, y: position1)
//        enemyLaser1.position = CGPoint(x: position1, y: position1)
//        enemyLaser2.position = CGPoint(x: position2, y: position2)
//        enemyLaser3.position = CGPoint(x: position3, y: position3)
//        enemyLaser4.position = CGPoint(x: position4, y: position4)
        
//        enemyLaser.position.y -= 5
//        addChild(enemyLaser)

        //let laserEndPoint = CGPoint(x: enemyLaser.position.x, y: -600)
//        let enemyFire = SKAction.move(to: laserEndPoint, duration: 1.0)
//        let laserDelay = SKAction.wait(forDuration: 10)
//        let enemyFire = SKAction.move(to: CGPoint(x: enemyLaser.position.x, y: -600), duration: 3.0)
//        let enemyFire1 = SKAction.move(to: CGPoint(x: position1, y: -600), duration: 3.0)
//        let enemyFire2 = SKAction.move(to: CGPoint(x: position2, y: -600), duration: 3.0)
//        let enemyFire3 = SKAction.move(to: CGPoint(x: position3, y: -600), duration: 3.0)
//        let enemyFire4 = SKAction.move(to: CGPoint(x: position4, y: -600), duration: 3.0)
//        let enemyFireRemove = SKAction.removeFromParent()
//        enemyLaser.run(SKAction.sequence([laserDelay, enemyFire, /*enemyFire1, enemyFire2, enemyFire3, enemyFire4, */enemyFireRemove]))
    
    }