SwiftUI中展示AdMob插屏广告导致NavigationLink失效问题排查

环境信息 #

• SwiftUI 5.0
• iOS 17.0
• Xcode 15

预期流程 #

HOME >> 展示插屏广告 >> CONTENT >> SETTINGS

实际异常 #

展示广告后导航链完全断裂：

• 进入Content View后，「To Settings」链接无响应
• 返回Home View后，原本的「To Content」链接也失效
• 仅系统自带的返回按钮可正常使用

复现步骤 #

1. 安装GoogleMobileAds库并配置plist相关字段
2. 等待广告加载完成后，点击Home View的「To Content」链接
3. 展示并关闭测试广告，进入Content View
4. 点击「To Settings」无响应；返回Home View后，「To Content」同样失效

App代码 #

import SwiftUI
import GoogleMobileAds

@main
struct AdsTestApp: App {
    
    let adManager = InterstitialAdsManager.shared
    
    init(){
        initMobileAds()
        
    }
    
    var body: some Scene {
        WindowGroup {
            HomeView()
        }
    }
    
    func initMobileAds() {
   
        GADMobileAds.sharedInstance().start(completionHandler: nil)
        GADMobileAds.sharedInstance().disableSDKCrashReporting()
        InterstitialAdsManager.shared.loadInterstitialAd()
    }
}

HomeView代码 #

import SwiftUI

struct HomeView: View {
    @State var showAd: Bool = true
    
    var body: some View {
        NavigationStack{
            VStack {
                NavigationLink(destination: ContentView(showAd: $showAd)){
                    Image(systemName: "globe")
                        .imageScale(.large)
                        .foregroundStyle(.tint)
                    Text("To Content")
                }
            }
            .padding()

        }
        
    }
       
}

#Preview {
    HomeView()
}

ContentView代码 #

import SwiftUI

struct ContentView: View {
    @Binding var showAd: Bool
    let adsManager = InterstitialAdsManager.shared
  
    var body: some View {
        
        ZStack() {
            
                NavigationLink {
                    SettingsView()
                    
                } label: {
                    Label("To Settings", systemImage: "slider.horizontal.3")
                        .font(.title)
                        .frame(maxWidth: .infinity, maxHeight: .infinity )
                }

        }
        .background(.yellow)
        .onAppear(){
            if(showAd){
                adsManager.displayInterstitialAd()
            }
            showAd.toggle()
        }
        
    }
        
}

SettingsView代码 #

import SwiftUI

struct SettingsView: View {
    var body: some View {
        VStack() {
                Text("Hello, World!")
                    .font(.title)
                    .frame(maxWidth: .infinity, maxHeight: .infinity )
                    .padding(.all)

        }
        .background(.green)
    }
}

#Preview {
    SettingsView()
}

InterstitialAdManager代码 #

import Foundation
import GoogleMobileAds

class InterstitialAdsManager: NSObject, GADFullScreenContentDelegate, ObservableObject {
    
    // Properties
   @Published var interstitialAdLoaded:Bool = false
    var interstitialAd:GADInterstitialAd?
    static let shared = InterstitialAdsManager()
    
    override init() {
        super.init()
    }

    
    func loadInterstitialAd(){
        GADInterstitialAd.load(withAdUnitID: "ca-app-pub-3940256099942544/4411468910", request: GADRequest()) { [weak self] add, error in
            guard let self = self else {return}
            if let error = error{
                print("🔴: \(error.localizedDescription)")
                self.interstitialAdLoaded = false
                return
            }
            #if DEBUG
            print("🟢: Ad Loading succeeded")
            #endif
            self.interstitialAdLoaded = true
            self.interstitialAd = add
            self.interstitialAd?.fullScreenContentDelegate = self
        }
    }
    
    func displayInterstitialAd(){
        
        let scenes = UIApplication.shared.connectedScenes
        let windowScene = scenes.first as? UIWindowScene
        let window = windowScene?.windows.first
        
        guard let root = window?.rootViewController else {
            return
        }
        
        if let ad = interstitialAd{
            ad.present(fromRootViewController: root)
            self.interstitialAdLoaded = false
        }else{
            print("🔵: Ad not ready")
            self.interstitialAdLoaded = false
            self.loadInterstitialAd()
        }
    }
    
    // Failure notification
    func ad(_ ad: GADFullScreenPresentingAd, didFailToPresentFullScreenContentWithError error: Error) {
        #if DEBUG
        print("🟡: Failed to display interstitial ad: \(error.localizedDescription)")
        #endif
        self.loadInterstitialAd()
    }
    
    // Indicate notification
    func adWillPresentFullScreenContent(_ ad: GADFullScreenPresentingAd) {
        #if DEBUG
        print("🤩: Displayed an interstitial ad")
        #endif
        self.interstitialAdLoaded = false
    }
    
    // Close notification
    func adDidDismissFullScreenContent(_ ad: GADFullScreenPresentingAd) {
        #if DEBUG
        print("😔: Interstitial ad closed")
        #endif
        self.loadInterstitialAd()
    }
}

内容的提问来源于stack exchange，提问作者zBandit