为什么我不能在函数更新中调用函数？

Question

请帮帮我！我试图调用我在GameScene类中声明的函数，在更新函数中。但它不识别函数，我想知道这是否与类或某事有关，因为我想每帧都运行该函数（但必须根据自己的运动更新每个单独的spriteCopy）以确保精灵副本都遵循该功能并继续无限地继续。

非常感谢您的帮助。

这里是排序的作品在一定程度上对函数的代码：

func touchUp(atPoint pos : CGPoint) { 

    if let spriteCopy = self.sprite?.copy() as! SKShapeNode? { 
     spriteCopy.fillColor = UIColor.white 
     spriteCopy.position = initialTouch 
     spriteCopy.physicsBody?.restitution = 0.5 
     spriteCopy.physicsBody?.friction = 0 
     spriteCopy.physicsBody?.affectedByGravity = false 
     spriteCopy.physicsBody?.linearDamping = 0 
     spriteCopy.physicsBody?.angularDamping = 0 
     spriteCopy.physicsBody?.angularVelocity = 0 
     spriteCopy.physicsBody?.isDynamic = true 
     spriteCopy.physicsBody?.categoryBitMask = 1 //active 
     spriteCopy.isHidden = false 

     touchUp = pos 

     xAxisLength = initialTouch.x - touchUp.x 
     yAxisLength = initialTouch.y - touchUp.y 
     xUnitVector = xAxisLength/distanceBetweenTouch * power * 300 
     yUnitVector = yAxisLength/distanceBetweenTouch * power * 300 
     spriteCopy.physicsBody?.velocity = CGVector(dx: xUnitVector, dy: yUnitVector) 


     func directionRotation() { 
      if let body = spriteCopy.physicsBody { 
       if (body.velocity.speed() > 0.01) { 
        spriteCopy.zRotation = body.velocity.angle() 
       } 
      } 
     } 

     directionRotation() //When I run the function with this line, the spriteCopy 
          //is spawned initially with the right angle (in the direction 
          //of movement) but doesn't stay updating the angle 


     sprite?.isHidden = true 

     self.addChild(spriteCopy) 


    } 

} 

，这里是在功能上的更新不被识别的功能：

override func update(_ currentTime: TimeInterval) { 

    directionRotation() //this line has error saying "use of unresolved identifier" 

    // Called before each frame is rendered 
} 

编辑：我想也许可以有一种方法来产生多个spriteCopy的没有“副本（）”方法，它们不会限制对spriteCopy的属性进行产生后的访问？同时记住它们仍然必须是单独的SpriteNodes，以便DirectionRotation函数可以独立应用于每个SpriteNode（FYI：用户可以产生超过50个Sprite节点）

Answer 1

您已指定本地函数。你需要从润色功能实现directionRotation

func directionRotation() { 
    if let body = spriteCopy.physicsBody { 
     if (body.velocity.speed() > 0.01) { 
      spriteCopy.zRotation = body.velocity.angle() 
     } 
    } 
} 
func touchUp(atPoint pos : CGPoint) { 

... 
} 

编辑搬出

我的意思是，你需要做一些这样想：

func directionRotation(node:SKNode) { 
    if let body = node.physicsBody { 
     if (body.velocity.speed() > 0.01) { 
      node.zRotation = body.velocity.angle() 
     } 
    } 
} 
override func update(_ currentTime: TimeInterval) { 

    for node in self.children 
    { 
     directionRotation(node) 
    } 
}