如何在SpriteKit / Swift 3中创建一个Share按钮？

Question

我是Spritekit的新手，我正在创建一个游戏，其中我有一个共享按钮的图像，我希望用户点击它来显示UIActivityViewController。我知道如何在UIKit中做到这一点，但在SpriteKit中却没有。

  

这是我的代码。

      // var ShareButton : UIButton!


 ShareButton = UIButton.init(frame: CGRectMake(self.view!.frame.size.width/2 - 80,self.view!.frame.size.height/2 + 140 , 163, 54))

    ShareButton.setImage(UIImage(named: "share"), forState: UIControlState.Normal)

    ShareButton.addTarget(self, action: "pressedShareButton:", forControlEvents: .TouchUpInside)

    self.view!.addSubview(ShareButton)



     func pressed(_ sender: UIButton!) {


     let va = self.view?.window?.rootViewController

     let myText = "Can you beat my score \(score) in this game.  "

     let activityVC:UIActivityViewController = UIActivityViewController(activityItems: [myText], applicationActivities: nil)

     va?.present(activityVC, animated: true, completion: nil)




     }