Ios Swift如何从视图控制器运行函数并更改场景中的变量？

我已经在我的应用程序中实现了Admob奖励视频广告

广告的代码在视图控制器中，并在游戏场景中触发

但是，当我在视频结束后奖励用户时，我希望对场景中的变量执行操作

这是视图控制器中奖励用户的代码：

func rewardBasedVideoAd(_ rewardBasedVideoAd: GADRewardBasedVideoAd, didRewardUserWith reward: GADAdReward) {


    if let scene3 = GameOverMenu(fileNamed: "Gameover") {

    let oldCoin = UserDefaults.standard.integer(forKey: "COINSCORE")
    let newCoin = oldCoin + 20
    UserDefaults.standard.set(newCoin, forKey: "COINSCORE")
    UserDefaults.standard.synchronize()
   scene3.coinLabel.removeFromParent()
   scene3.createCoinScore()


    }
}

用户默认值会更改，但是coinLabel不会删除，CreateConScore触发器也不会删除

 var scene3: GameOverMenu!

这帮我修好了

 func rewardBasedVideoAd(_ rewardBasedVideoAd: GADRewardBasedVideoAd, didRewardUserWith reward: GADAdReward) {

    if let view = self.view as! SKView? {

    if let scene3 = GameOverMenu(fileNamed: "Gameover") {

        scene3.viewController = self
        scene3.scaleMode = .aspectFill
        view.presentScene(scene3)

        let oldCoin = UserDefaults.standard.integer(forKey: "COINSCORE")
        let newCoin = oldCoin + 20
        UserDefaults.standard.set(newCoin, forKey: "COINSCORE")
        UserDefaults.standard.synchronize()
        scene3.coinLabel.removeFromParent()
        scene3.createCoinScore()



    }
    }


}