从节点

Question

我有这个sene，里面有很少的节点。它是圈内圈内的圆圈。按下里面的最小圆圈，我用几个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")


            }

    }

    }
}

触摸结束时，我会删除此操作：

   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")
        }


}
}

但是当我用手指向这个圆圈移开手指时，它会一直播放。我尝试用touchesMoved函数修复它，但它对我来说有点奇怪。

覆盖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")

            }

        }
     }   
    }

所以我收到了这个＆＃34;我从节点开始＃34;信号，但行动不要停止。 我哪里错了？相同的代码适用于touchesEnded函数。

Answer 1

因为这个问题而发生问题

if let theCircle = nodeAtPoint(location) as SKNode?

每次移动鼠标时，＆＃34; theCircle＆＃34;复位。例如，您第一次单击圆圈，＆＃34; theCircle＆＃34;是您单击的圆，因此动画附加到它。比如第二次，你点击了背景，这次＆＃34; theCircle＆＃34;是背景，所以它没有你设置的动画，因此没有办法删除动画＆＃34;。

解决方法是，您将圆圈声明为范围级别变量，通常位于类中，位于顶部：

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"

这一次，您可以指向touchMoved中的圆圈：

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。