触摸开始在Xcode 8.0 beta上使用Swift 3.0

Question

我在Xcode 8.0 beta上用swift 3.0制作游戏.在我的GameScene中我有这个touchBegan功能:

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    for t in touches {
        let location = t.location(in: self)
        let nodeAtTouch = self.atPoint(location)
        let touchedSprite = nodeAtTouch as! SKSpriteNode
        print("Touch Detected")
        if touchedSprite is SKButton {
            print("Button Touched")
            touchedSprite.run(SKAction.resize(byWidth: 25, height: 25, duration: 0.25))
        }
    }
}

由于某些奇怪的原因,当我触摸屏幕时,第6行上的打印不会打印出来,因此意味着没有检测到触摸.任何想法或修复,是否有其他人有这个问题？提前致谢.