在 SwiftUI (5) 和 Xcode (12.4) 中实现 AdMob 插页式广告

我正在努力在我的应用程序中实现插页式广告，但对 AdMob 提供的文档和新的 SwiftUI 应用程序结构遇到了一些困惑。

这里是app.swift文件，显示我已经实现了 GoogleMobileAds 并在didFinishLaunchingWithOptions method.

import SwiftUI
import GoogleMobileAds
    
@main
struct AdamsCalcApp: App {
    var calculator = Calculator()
        
    @UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
        
    var body: some Scene {
        WindowGroup {
            ContentView().environmentObject(calculator)
        }
    }
}
    
class AppDelegate: NSObject, UIApplicationDelegate {
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
        // Setup Google AdMob instance
        GADMobileAds.sharedInstance().start(completionHandler: nil)
        return true
    }
}

In my ContentView.swift文件中，我创建了间隙变量，如下所示：

@State var interstitial: GADInterstitialAd?

然后，在视图的主堆栈上，我调用onAppear(perform:)加载广告：

.onAppear(perform: {
    let request = GADRequest()
    GADInterstitialAd.load(withAdUnitID:"ca-app-pub-3940256099942544/4411468910",
                           request: request,
                           completionHandler: { [self] ad, error in
                               if let error = error { return }
                               interstitial = ad
                               interstitial?.fullScreenContentDelegate = self
                           }
    )
})

但是，我不断收到此错误：

“无法将‘ContentView’类型的值分配给‘GADFullScreenContentDelegate’类型？”

在尝试了几种不同的解决方法并尝试查找与我类似的设置后，我感觉有点无能为力。 AdMob 文档仍然只展示如何实现它UIViewController但我想知道如何在 SwiftUI 中做到这一点。

import SwiftUI
import GoogleMobileAds
import AppTrackingTransparency
import AdSupport

class AdsManager: NSObject, ObservableObject {
    
    private struct AdMobConstant {
        static let interstitial1ID = "..."
    }
    
    final class Interstitial: NSObject, GADFullScreenContentDelegate, ObservableObject {

        private var interstitial: GADInterstitialAd?
        
        override init() {
            super.init()
            requestInterstitialAds()
        }

        func requestInterstitialAds() {
            let request = GADRequest()
            request.scene = UIApplication.shared.connectedScenes.first as? UIWindowScene
            ATTrackingManager.requestTrackingAuthorization(completionHandler: { status in
                GADInterstitialAd.load(withAdUnitID: AdMobConstant.interstitial1ID, request: request, completionHandler: { [self] ad, error in
                    if let error = error {
                        print("Failed to load interstitial ad with error: \(error.localizedDescription)")
                        return
                    }
                    interstitial = ad
                    interstitial?.fullScreenContentDelegate = self
                })
            })
        }
        func showAd() {
            let root = UIApplication.shared.windows.last?.rootViewController
            if let fullScreenAds = interstitial {
                fullScreenAds.present(fromRootViewController: root!)
            } else {
                print("not ready")
            }
        }
        
    }
    
    
}


class AdsViewModel: ObservableObject {
    static let shared = AdsViewModel()
    @Published var interstitial = AdsManager.Interstitial()
    @Published var showInterstitial = false {
        didSet {
            if showInterstitial {
                interstitial.showAd()
                showInterstitial = false
            } else {
                interstitial.requestInterstitialAds()
            }
        }
    }
}

@main
struct YourApp: App {
    let adsVM = AdsViewModel.shared
    init() {
        GADMobileAds.sharedInstance().start(completionHandler: nil)
    }

    var body: some Scene {
        WindowGroup {
            ContentView()
                .environmentObject(adsVM)
    }
}

切换显示插页式广告中的参数广告视图模型应用程序中的任何位置都会显示广告。