arrays - 迭代 SKShapeNodes 数组

Question

苦苦思索如何遍历 SKShapeNode 数组。我似乎可以在 DidMoveToView() 中完成它，但不能在 WhenTouchesBegan() 中完成。

来自 GameScene.swift:

class GameScene: SKScene {
...
     var areaTwo = SKShapeNode()
     var areaThree = SKShapeNode()
     var areaFour = SKShapeNode()
     var currentArea = SKShapeNode()

//CGPaths as UIBezierPaths set here


     var areas = [SKShapeNode]()

    override func didMoveToView(view: SKView) {
...
          areaTwo = SKShapeNode(path: areaTwoPath.CGPath)
          areaThree = SKShapeNode(path: areaThreePath.CGPath)
          areaFour = SKShapeNode(path: areaFourPath.CGPath)
          let areas = [areaTwo, areaThree, areaFour]
...
//this works
          for area in areas {
               area.lineWidth = 4
                addChild(area)
          }
    }

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

        for touch in touches {
          let location = touch.locationInNode(self)
              currentArea.fillColor = UIColor.clearColor()

//this does not work! No errors thrown. Just doesn't seem to do anything.             
              for area in areas{
                   currentArea = area
                   if currentArea.containsPoint(location) {
                        currentArea.fillColor = UIColor.redColor()
               }
             }
         }
    }

令人沮丧的是，如果我使用一系列 if...else if...else if 我可以检查每个区域，但无法通过数组检查它们。

Answer 1

不太清楚你的目标。如果你只是想要一种迭代子节点的方法，你可以尝试

//init child nodes
for i in 1...2{
  let areaNode = SKShapeNode()
  ...
  areaNode.name = "area"
  parentNode.addChild(areaNode)
}

//iteration
for node in parentNode.children{
  if node.name == "area"{
    print("here we find a child area")
  }else{
    print("some irrelevant node found")
  }
}

顺便说一句，你的代码在 didMoveToView() 中工作的原因是你声明了一个新的 areas 数组，这实际上是一个方法内变量取代了上一类属性 areas