如何在SpriteKit中向SKScene提供插页式广告？

Question

我一直在尝试在我的项目中为一个视图实现一个插页式广告，但我总是得到同样的错误：“当我在下面定义调用时，无法将'Start'类型的值转换为预期的参数类型'UIViewController'”

有人知道如何在SprtieKit中实现它们，因为我只找到了Swift资源吗？

这是我的代码：

import SpriteKit
import GameKit
import GoogleMobileAds

class Start: SKScene, GADInterstitialDelegate{

var interstitial: GADInterstitial!

override func didMove(to view: SKView) {

interstitial = createAndLoadInterstitial()
    interstitial.delegate = self
    if self.interstitial.isReady {
        NotificationCenter.default.addObserver(self, selector: Selector(("quitToLevel:")), name: NSNotification.Name(rawValue: "quitToLevelID"), object: nil)
    interstitial.present(fromRootViewController: self) //->Error: Cannot convert value of type 'Start' to expected argument type 'UIViewController'
     }else{
        print("add didn´t load")
    }
 }
    func createAndLoadInterstitial() -> GADInterstitial {
    let interstitial = GADInterstitial(adUnitID: "ca-app-pub-3940256099942544/4411468910")
    interstitial.delegate = self
    interstitial.load(GADRequest())
    return interstitial
}

func interstitialDidDismissScreen(_ ad: GADInterstitial) {
    interstitial = createAndLoadInterstitial()
}
}