swift - 如何创建拥有相同方法的 "identical"SpriteNode？

Question

我对编码非常陌生(就像我昨天刚开始的一样)。我试图让同一个 SpriteNode 出现多次并遵循相同的方法。例如，游戏一开始有一个对触摸使用react的节点，在达到 5 点后出现另一个节点，在 15 点后又出现另一个节点，依此类推……我已经能够在 5 点时生成 spriteCopy；但是我无法让它像原始节点一样响应触摸。我确信这是非常简单的事情，我只是没有经验。谢谢。

这是迄今为止我的代码:

class GameScene: SKScene {
var sprite: SKSpriteNode!
var touchPoint: CGPoint = CGPoint()
var touching: Bool = false
var score: Int = 0
let scoreTextNode = SKLabelNode(fontNamed: "Helvetica Neue UltraLight")

override func didMoveToView(view: SKView) {

    sprite = SKSpriteNode(imageNamed: "PongBall")
    sprite.position = CGPoint(x: 500,y: 500)
    sprite.size = CGSize(width: 75, height: 75)
    sprite.physicsBody = SKPhysicsBody(circleOfRadius: 37.5)
    self.addChild(sprite)

    scoreTextNode.text = "\(score)"
    scoreTextNode.fontSize = 70
    scoreTextNode.fontColor = SKColor.blackColor()
    scoreTextNode.position = CGPoint (x: 680.734, y: 700.941)
    self.addChild(scoreTextNode)
}



override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {

    let touch = touches.first as UITouch!
    let location = touch.locationInNode(self)
    if sprite.frame.contains(location) {
        touchPoint = location
        touching = true
    }

    if touchPoint == location {
        self.score += 1
        self.scoreTextNode.text = "\(score)"
    }

    let spriteCopy = sprite.copy() as! SKSpriteNode
    if score == 5 {
        self.addChild(spriteCopy)
    }
}


override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {

    let touch = touches.first as UITouch!
    let location = touch.locationInNode(self)
    touchPoint = location


}
override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
    touching = false
}

override func update(currentTime: CFTimeInterval) {

    if touching {
        let dt:CGFloat = 1.0/30.0
        let distance = CGVector(dx: touchPoint.x-sprite.position.x, dy: touchPoint.y-sprite.position.y)
        let velocity = CGVector(dx: distance.dx/dt, dy: distance.dy/dt)
        sprite.physicsBody!.velocity=velocity
    }

}

}

Answer 1

你的问题是你的屏幕上出现了多个 Sprite ，但你没有对它们做任何事情。为了让事情变得简单，请采用这种方法。

class GameScene: SKScene {
  var sprite: SKSpriteNode!
  var touchPoint: CGPoint = CGPoint()
  var touching: Bool = false
  var score: Int = 0
  let scoreTextNode = SKLabelNode(fontNamed: "Helvetica Neue UltraLight")
  var spriteList = [SKSpriteNode]() //Add this line

  override func didMoveToView(view: SKView) {

    sprite = SKSpriteNode(imageNamed: "PongBall")
    sprite.position = CGPoint(x: 500,y: 500)
    sprite.size = CGSize(width: 75, height: 75)
    sprite.physicsBody = SKPhysicsBody(circleOfRadius: 37.5)
    self.addChild(sprite)
    spriteList.append(sprite)  //Add This line
    scoreTextNode.text = "\(score)"
    scoreTextNode.fontSize = 70
    scoreTextNode.fontColor = SKColor.blackColor()
    scoreTextNode.position = CGPoint (x: 680.734, y: 700.941)
    self.addChild(scoreTextNode)
  } 



   override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {

     let touch = touches.first as UITouch!
     let location = touch.locationInNode(self)
     for sprite in spriteList{ //Add This line
         if sprite.frame.contains(location) {
           touchPoint = location
           touching = true
         }

         if touchPoint == location {
            self.score += 1
            self.scoreTextNode.text = "\(score)"
         } 

         let spriteCopy = sprite.copy() as! SKSpriteNode
         if score == 5 {
           self.addChild(spriteCopy)
           spriteList.append(spriteCopy)  //Add this line
         }
       } //Add this line
   }


   override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {

     let touch = touches.first as UITouch!
     let location = touch.locationInNode(self)
     touchPoint = location
   }
   override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
     touching = false
   }

   override func update(currentTime: CFTimeInterval) {

     if touching {
       for sprite in spriteList{ //Add this line
         let dt:CGFloat = 1.0/30.0
         let distance = CGVector(dx: touchPoint.x-sprite.position.x, dy: touchPoint.y-sprite.position.y)
         let velocity = CGVector(dx: distance.dx/dt, dy: distance.dy/dt)
         sprite.physicsBody!.velocity=velocity
       } //Add this line
     }
   }
 }

基本概念是在数组中维护它。对于初学者来说，这应该是一个很好的起点。在学习如何重写类之后，您可以了解到触摸代码可以在 Sprite 内部完成，而不是在场景内部完成。这实际上是我的首选方法。