从节点滑动时的 RemoveAction

Question

我有这个场景，里面只有几个节点。它是圈内圈内圈。按下里面最小的圆圈，我用很少的 SKActions 制作了这个动画。

 override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
    /* Called when a touch begins */

    let growOut = SKAction.scaleTo(1.2, duration: 0.3)
    let growIn = SKAction.scaleTo(1.0, duration: 0.5)
    let glowOut = SKAction.fadeAlphaTo(0.5, duration: 0.3)
    let glowIn = SKAction.fadeAlphaTo(1, duration: 0.5)
    let sOut = SKAction.group([glowOut, growOut])
    let sIn = SKAction.group([glowIn, growIn])
    let circleTouched = SKAction.sequence([sOut, sIn])
    let circleRepeat = SKAction.repeatActionForever(circleTouched)


    for touch in touches {
        let location = (touch as! UITouch).locationInNode(self)
        if let theCircle = nodeAtPoint(location) as SKNode?{
        if theCircle.name == "SmallCircle" {
            theCircle.runAction(circleRepeat, withKey: "circleTouched")


            }

    }

    }
}

当触摸结束时，我像这样删除这个动作：

   override func touchesEnded(touches: Set<NSObject>, withEvent event: UIEvent) {

    let growIn = SKAction.scaleTo(1.0, duration: 0.5)
    let glowIn = SKAction.fadeAlphaTo(1, duration: 0.5)
    let sIn = SKAction.group([glowIn, growIn])

    for touch in touches {
        let location = (touch as! UITouch).locationInNode(self)
        if let theCircle = nodeAtPoint(location) as SKNode?{
          theCircle.runAction(sIn)
            theCircle.removeActionForKey("circleTouched")
        }


}
}

但是当我将手指移出这个带有动作的圆圈时，它会继续播放。我尝试用 touchesMoved 函数修复它，但它对我来说有点奇怪。

override func touchesMoved(touches: Set, withEvent event: UIEvent) {

    let growIn = SKAction.scaleTo(1.0, duration: 0.5)
    let glowIn = SKAction.fadeAlphaTo(1, duration: 0.5)
    let sIn = SKAction.group([glowIn, growIn])
    let circleRepeat = SKAction.repeatActionForever(circleTouched)

    for touch in touches {
        let location = (touch as! UITouch).locationInNode(self)
        if let theCircle = nodeAtPoint(location) as SKNode?{
            if theCircle.name != "SmallCircle" {

                println("I'M MOVING FROM NODE!!!")
                theCircle.runAction(sIn)
                theCircle.removeActionForKey("circleTouched")

            }

        }
     }   
    }

所以我收到这个 "I'M OUT OF THE NODE" 信号，但动作不会停止。我哪里错了？相同的代码适用于 touchesEnded 函数。

Answer 1

问题就是因为这个

if let theCircle = nodeAtPoint(location) as SKNode?

每次移动鼠标时，"theCircle" 都会重置。例如，第一次点击圆圈，"theCircle"就是你点击的圆圈，因此动画附在圆圈上。第二次，比如说，你点了背景，这次"theCircle"是背景，所以没有你设置的动画，所以没办法去掉"the animation".

解决办法是，你把圆圈声明为作用域级变量，通常在class内，在顶部：

var smallCircle: SKSpriteNode!

然后在didMoveToView(view: SKView)中配置圆圈(如果使用.sks):

smallCircle = childNodeWithName("the circle name") as! SKSpriteNode
smallCircle.name = "SmallCircle"

这次可以在touchMoved中指向圆圈：

for touch in (touches as! Set<UITouch>) {
  let location = touch.locationInNode(self)
  if let theCircle = nodeAtPoint(location) as SKNode?{
    if theCircle.name != "SmallCircle" {
      smallCircle.runAction(sIn)
      smallCircle.removeActionForKey("circleTouched")
    }
  }
}

最后，你会发现动画停止了。

从节点滑动时的 RemoveAction

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