SwiftUI展示AdMob插页广告导致导航流程中断问题求助

我的应用包含Dashboard视图，用户点击其中项目时应导航至详情视图并全屏展示。但当前存在问题：展示AdMob插页广告后，详情视图（子视图）仅短暂显示，随即自动返回Dashboard视图（父视图）。Dashboard跳转至详情视图的代码为标准实现，以下是我的AdMob管理代码：

class InterstitialAdsManager: NSObject, GADFullScreenContentDelegate, ObservableObject {

    @Published var interstitialAdLoaded: Bool = false

    var interstitialAd: GADInterstitialAd?

    let AD_UNIT_ID = "ca-app-pub-3940256032142544/xxxxxxxxx"

    override init() {
        super.init()
    }

    func loadInterstitialAd() {
    
        GADInterstitialAd.load(withAdUnitID: AD_UNIT_ID, request: GADRequest()) { [weak self] ad, error in
        
            guard let self = self else { return }
        
            if let error = error {
            
                print("🔴: \(error.localizedDescription)")
                self.interstitialAdLoaded = false
            
                return
            
            }
        
            print("🟢: Loading succeeded")
            self.interstitialAdLoaded = true
            self.interstitialAd = ad
            self.interstitialAd?.fullScreenContentDelegate = self
        
        }
    
    }

    func displayInterstitialAd(viewController: UIViewController) {

        let root = UIApplication.shared.windows.last?.rootViewController

        if let ad = interstitialAd {
        
            ad.present(fromRootViewController: root)
            self.interstitialAdLoaded = false
        
        } else {
        
            print("🔵: Ad wasn't ready")
            self.interstitialAdLoaded = false
            self.loadInterstitialAd()
        
        }
    
    }

    func ad(_ ad: GADFullScreenPresentingAd, didFailToPresentFullScreenContentWithError error: Error) {

        print("🟡: Failed to display interstitial ad")
        self.loadInterstitialAd()
    
    }

    func adWillPresentFullScreenContent(_ ad: GADFullScreenPresentingAd) {

        print("🤩: Displayed an interstitial ad")
        self.interstitialAdLoaded = false
    
    }

    func adDidDismissFullScreenContent(_ ad: GADFullScreenPresentingAd) {

        print("😔: Interstitial ad closed")
    
    }

}

问题根源 #

你在displayInterstitialAd方法里使用全局的UIApplication.shared.windows.last?.rootViewController作为广告的展示根控制器，这会让广告直接覆盖整个应用的根视图栈。当广告关闭后，系统会自动回到根控制器层级，导致刚推入导航栈的详情视图被强制退回。

修复方案 #

1. 修正广告展示的控制器 #

把广告展示的根控制器改成传入的viewController参数，这样广告会在当前导航栈的上下文内展示，不会破坏原有视图层级：

func displayInterstitialAd(viewController: UIViewController) {
    if let ad = interstitialAd {
        // 替换全局root为传入的当前控制器
        ad.present(fromRootViewController: viewController)
        self.interstitialAdLoaded = false
    } else {
        print("🔵: Ad wasn't ready")
        self.interstitialAdLoaded = false
        self.loadInterstitialAd()
    }
}

2. 调整广告与导航的时序 #

避免同时触发导航和广告展示，二选一拆分流程：

• 先展示广告，再进详情：在adDidDismissFullScreenContent回调中执行导航到详情视图的逻辑
• 先进详情，再展示广告：在详情视图的viewDidAppear方法里调用广告展示方法，确保视图已经完成入栈

3. 补充广告关闭后的加载逻辑 #

在广告关闭后重新加载下一个广告，保证后续展示可用：

func adDidDismissFullScreenContent(_ ad: GADFullScreenPresentingAd) {
    print("😔: Interstitial ad closed")
    // 重新加载广告，为下一次展示做准备
    self.loadInterstitialAd()
}

额外注意事项 #

• 不要在导航跳转的同步流程里触发广告展示，必须拆分为异步操作（等待广告关闭再导航，或导航完成后再弹广告）
• 确保interstitialAdLoaded的状态更新准确，避免重复触发广告展示

内容的提问来源于stack exchange，提问作者Learn2Code