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我正在尝试使用 Google 的文档在 SwiftUI 项目中实现 AdMob 开放广告：https://developers.google.com/admob/ios/app-open-ads。问题是文档完全是使用 AppDelegate 编写的。

我尝试通过在 @main 上方使用此方法添加 AppDelegate 类来实现打开广告，但它根本不起作用。没有错误，但也没有广告。

class AppDelegate: UIResponder, UIApplicationDelegate, GADFullScreenContentDelegate {
   let nc = NotificationCenter.default
   func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
       GADMobileAds.sharedInstance().start(completionHandler: nil)
       return true
   }
   
   var appOpenAd: GADAppOpenAd?
   var loadTime = Date()
   
   func requestAppOpenAd() {
       let request = GADRequest()
       GADAppOpenAd.load(withAdUnitID: "ca-app-pub-3940256099942544/5662855259",
                         request: request,
                         orientation: UIInterfaceOrientation.portrait,
                         completionHandler: { (appOpenAdIn, _) in
                           self.appOpenAd = appOpenAdIn
                           self.appOpenAd?.fullScreenContentDelegate = self
                           self.loadTime = Date()
                           print("Ad …