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import GoogleMobileAds
import UIKit

class ViewController: UIViewController {

  private var interstitial: GADInterstitial?

  override func viewDidLoad() {
    super.viewDidLoad()

    Task {
      do {
        interstitial = try await GADInterstitial.load(
          withAdUnitID: "ca-app-pub-3940256099942544/4411468910", request: GADRequest())
      } catch {
        print("Failed to load interstitial ad with error: \(error.localizedDescription)")
      }
    }
  }
}

import GoogleMobileAds

class InterstitialViewModel: NSObject, GADFullScreenContentDelegate {
  private var interstitialAd: GADInterstitialAd?

  func loadAd() async {
    do {
      interstitialAd = try await GADInterstitialAd.load(
        withAdUnitID: "ca-app-pub-3940256099942544/4411468910", request: GADRequest())
      interstitialAd?.fullScreenContentDelegate = self
    } catch {
      print("Failed to load interstitial ad with error: \(error.localizedDescription)")
    }
  }
InterstitialViewModel.swift

@import GoogleMobileAds;
@import UIKit;

@interface ViewController ()

@property(nonatomic, strong) GADInterstitial *interstitial;

@end

@implementation ViewController

- (void)viewDidLoad {
  [super viewDidLoad];
  GADRequest *request = [GADRequest request];
  [GADInterstitial loadWithAdUnitID:@"ca-app-pub-3940256099942544/4411468910"
      request:request
      completionHandler:^(GADInterstitial *ad, NSError *error) {
    if (error) {
      NSLog(@"Failed to load interstitial ad with error: %@", [error localizedDescription]);
      return;
    }
    self.interstitial = ad;
  }];
}

import GoogleMobileAds
import UIKit

class ViewController: UIViewController, GADFullScreenContentDelegate {

  private var interstitial: GADInterstitial?

  override func viewDidLoad() {
    super.viewDidLoad()

    Task {
      do {
        interstitial = try await GADInterstitial.load(
          withAdUnitID: "ca-app-pub-3940256099942544/4411468910", request: GADRequest())
        interstitial?.fullScreenContentDelegate = self
      } catch {
        print("Failed to load interstitial ad with error: \(error.localizedDescription)")
      }
    }
  }

  /// Tells the delegate that the ad failed to present full screen content.
  func ad(_ ad: GADFullScreenPresentingAd, didFailToPresentFullScreenContentWithError error: Error) {
    print("Ad did fail to present full screen content.")
  }

  /// Tells the delegate that the ad will present full screen content.
  func adWillPresentFullScreenContent(_ ad: GADFullScreenPresentingAd) {
    print("Ad will present full screen content.")
  }

  /// Tells the delegate that the ad dismissed full screen content.
  func adDidDismissFullScreenContent(_ ad: GADFullScreenPresentingAd) {
    print("Ad did dismiss full screen content.")
  }
}

interstitialAd?.fullScreenContentDelegate = self
InterstitialViewModel.swift

func adDidRecordImpression(_ ad: GADFullScreenPresentingAd) {
  print("\(#function) called")
}

func adDidRecordClick(_ ad: GADFullScreenPresentingAd) {
  print("\(#function) called")
}

func ad(
  _ ad: GADFullScreenPresentingAd,
  didFailToPresentFullScreenContentWithError error: Error
) {
  print("\(#function) called")
}

func adWillPresentFullScreenContent(_ ad: GADFullScreenPresentingAd) {
  print("\(#function) called")
}

func adWillDismissFullScreenContent(_ ad: GADFullScreenPresentingAd) {
  print("\(#function) called")
}

func adDidDismissFullScreenContent(_ ad: GADFullScreenPresentingAd) {
  print("\(#function) called")
  // Clear the interstitial ad.
  interstitialAd = nil
}
InterstitialViewModel.swift

@import GoogleMobileAds;
@import UIKit;

@interface ViewController () <GADFullScreenContentDelegate>

@property(nonatomic, strong) GADInterstitial *interstitial;

@end

@implementation ViewController

- (void)viewDidLoad {
  [super viewDidLoad];
  GADRequest *request = [GADRequest request];
  [GADInterstitial loadWithAdUnitID:@"ca-app-pub-3940256099942544/4411468910"
      request:request
      completionHandler:^(GADInterstitial *ad, NSError *error) {
    if (error) {
      NSLog(@"Failed to load interstitial ad with error: %@", [error localizedDescription]);
      return;
    }
    self.interstitial = ad;
    self.interstitial.fullScreenContentDelegate = self;
  }];
}

/// Tells the delegate that the ad failed to present full screen content.
- (void)ad:(nonnull id<GADFullScreenPresentingAd>)ad
didFailToPresentFullScreenContentWithError:(nonnull NSError *)error {
    NSLog(@"Ad did fail to present full screen content.");
}

/// Tells the delegate that the ad will present full screen content.
- (void)adWillPresentFullScreenContent:(nonnull id<GADFullScreenPresentingAd>)ad {
    NSLog(@"Ad will present full screen content.");
}

/// Tells the delegate that the ad dismissed full screen content.
- (void)adDidDismissFullScreenContent:(nonnull id<GADFullScreenPresentingAd>)ad {
  NSLog(@"Ad did dismiss full screen content.");
}

guard let interstitial = interstitial else {
  return print("Ad wasn't ready.")
}

// The UIViewController parameter is an optional.
interstitial.present(fromRootViewController: nil)

var body: some View {
  // ...
  }
  .onChange(of: countdownTimer.isComplete) { newValue in
    showGameOverAlert = newValue
  }
  .alert(isPresented: $showGameOverAlert) {
    Alert(
      title: Text("Game Over"),
      message: Text("You lasted \(countdownTimer.countdownTime) seconds"),
      dismissButton: .cancel(
        Text("OK"),
        action: {
          viewModel.showAd()
        }))
InterstitialContentView.swift

func showAd() {
  guard let interstitialAd = interstitialAd else {
    return print("Ad wasn't ready.")
  }

  interstitialAd.present(fromRootViewController: nil)
}
InterstitialViewModel.swift

if (self.interstitial) {
  // The UIViewController parameter is nullable.
  [self.interstitial presentFromRootViewController:nil];
} else {
  NSLog(@"Ad wasn't ready");
}