我们如何等待和收听 admob 插页式广告在 SwiftUI 视图中被关闭？

Question

我正在寻找一种解决方案，用于在显示插页式广告时暂停应用程序活动（例如音乐），然后在重新启动音乐等之前收听“adDidDismissFullScreenContent”通知。showAd() 函数正在工作，但因为我使用 SwiftUI 我不能直接使用 GADFullScreenContentDelegate 。

struct ContentView: View {
    var fullScreenAd: InterstitialAd?
    
    init() {
        fullScreenAd = InterstitialAd()
    }
    
    var body: some View {
    
        Button("Show Ad") {
            if fullScreenAd != nil {
                fullScreenAd!.showAd()
                // TODO: Pause activity until the ad has been dismissed.
            }
        }
    }
}

final class InterstitialAd: NSObject, GADFullScreenContentDelegate {
    var interstitial: GADInterstitialAd?
    var adID = "ca-app-pub-3940256099942544/4411468910"
    
    override init() {
        super.init()
        self.loadInterstitial()
    }
    
    func loadInterstitial() {
        let request = GADRequest()
        GADInterstitialAd.load(withAdUnitID: adID,
                               request: request,
                               completionHandler: { [self] ad, error in
            if let error = error {
                print("Failed to load interstitial")
                return
            }
            interstitial = ad
            interstitial?.fullScreenContentDelegate = self
        })
    }
    
    func showAd() {
        if self.interstitial != nil {
            guard let firstScene = UIApplication.shared.connectedScenes.first as? UIWindowScene else {
                return
            }
            guard let firstWindow = firstScene.windows.first else {
                return
            }
            let root = firstWindow.rootViewController
            self.interstitial?.present(fromRootViewController: root!)
        }
        else{
            print("Not Ready")
        }
    }
    
    // Tells the delegate that the ad dismissed full screen content.
    func adDidDismissFullScreenContent(_ ad: GADFullScreenPresentingAd) {
        print("Ad did dismiss full screen content.")
        self.loadInterstitial()
    }
}

Answer 1

我通过通知中心找到了一个解决方案，如下：

第 1 步：扩展通知

extension NSNotification.Name {
    static let onAdDidDismiss = Notification.Name("onAdDidDismiss")
}

第 2 步：从 InterstitialAd class 内部发布通知

    func adDidDismissFullScreenContent(_ ad: GADFullScreenPresentingAd) {
        NotificationCenter.default.post(name: .onAdDidDismiss, object: nil)
        self.loadInterstitial()
    }

第 3 步：根据需要在任何视图上处理 OnReceive()

 VStack {
        ...
        }
        .onReceive(NotificationCenter.default.publisher(for: .onAdDidDismiss)) { _ in
            musicIsPlaying = true
        }