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

【问题标题】：Implementing AdMob Interstitial Ads in SwiftUI (5) and Xcode (12.4)在 SwiftUI (5) 和 Xcode (12.4) 中实现 AdMob 插页式广告
【发布时间】：2021-09-11 01:31:10
【问题描述】：

我正在努力在我的应用中实施插页式广告，但对 Admob 提供的文档和新的 SwiftUI 应用结构感到有些困惑。

这是 app.swift 文件，显示我已实现 GoogleMobileAds 并在 didFinishLaunchingWithOptions 方法中启动它。

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
    }

}

在我的 ContentView.swift 文件中，我创建了间隙变量，如...

 @State var interstitial: GADInterstitialAd?

然后在视图的主堆栈上，我调用 onAppear(perform: ) 来加载广告，但是我一直收到此错误。

.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
                                      }
                    )

        })

“无法将类型 'ContentView' 的值分配给类型 'GADFullScreenContentDelegate?'"

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，我感觉有点不知所措，AdMob 文档仍然显示如何使用类 ViewControllers 实现，我想弄清楚如何做到这一点是 SwiftUI .

【问题讨论】：

你搜索过“SwiftUI interstitial”吗？有许多结果可能对您有用。
在浏览了 SwiftUI Interstitial 之后，我发现了对我有用的差异，我将在下面发布答案。
请看一下 SwiftUI 中的广告要点 - gist.github.com/dhanrajdc7/6442ff07fc27a15b4f062f70b3be2684
在 SwiftUI 中的 Ads 要点略有弃用，GADInterstitialDelegate 和 GADInterstitial 不再在范围内。

标签： xcode swiftui admob

【解决方案1】：

为了在最新的 SwiftUI 版本中使用 Admob 文档，您需要更改此行...

        .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
                                                }
                                     // Change these two lines of code
                                     interstitial = ad
                                                
                                     interstitial?.fullScreenContentDelegate = self
                                     // To...
                                     interstitial = ad
                                     let root = UIApplication.shared.windows.first?.rootViewController                                        
                      self.interstitial!.present(fromRootViewController: root!)
                                              }
                            )
        
                })

【讨论】：

【解决方案2】：

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)
    }
}

在应用程序的任意位置切换 AdsViewModel 中的 showInterstitial 参数，就会显示广告。

【讨论】：