Sprite-kit：检测左右触摸

Question

在我尝试构建的新游戏中，我想知道用户何时触摸了屏幕的BOTH左右两侧来执行一些逻辑。

我的代码：

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

    for touch in (touches as! Set<UITouch>) {
        let location = touch.locationInNode(self)
        var isRight : Bool = false
        var isLeft : Bool = false

        if(location.x < self.size.width/2){
            isLeft = true
            println("Left")
        }

        if(location.x > self.size.width/2){
            //
            isRight = true
            println("Right")
        }
        if (isRight && isLeft){
            println("Both touched")
            // do something..
        }
    }
}

控制台：

Right
Left

我的代码似乎不起作用。我在这里做错了什么？有人有更好的解决方案吗？

Answer 1

这样做；

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

   var isRight : Bool = false
   var isLeft : Bool = false

   for touch in (touches as! Set<UITouch>) {
        let location = touch.locationInNode(self)

        if(location.x < self.size.width/2){
            isLeft = true
            println("Left")
        }

        if(location.x > self.size.width/2){
            //
            isRight = true
            println("Right")
        }
    }

   if (isRight && isLeft){
      println("Both touched")
      // do something..
   }

}

更新：Swift 2.2

对于 SKView：

class skView:SKView {

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

        var isRight : Bool = false
        var isLeft : Bool = false

        for touch in touches {
            let location = touch.locationInView(self);

            if(location.x < self.frame.size.width/2){
                isLeft = true
                print("Left")
            }

            if(location.x > self.frame.size.width/2){
                //
                isRight = true
                print("Right")
            }
        }

        if (isRight && isLeft){
            print("Both touched")
            // do something..
        }

    }
}

对于 SKNode：

class skNode: SKNode {
    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
        var isRight : Bool = false
        var isLeft : Bool = false

        for touch in touches {
            let location = touch.locationInNode(self);

            if(location.x < self.frame.size.width/2){
                isLeft = true
                print("Left")
            }

            if(location.x > self.frame.size.width/2){
                //
                isRight = true
                print("Right")
            }
        }

        if (isRight && isLeft){
            print("Both touched")
            // do something..
        }
    }
}