Solution for the implementation of interstitial ads of admob (SwiftUI) - ios

Question

Starting with iOS16, there was a problem with the implementation of AdMob interstitial advertising. I am using the SwiftUI framework. I looked at many sources, but unfortunately I did not find a solution. Link to on a similar topic, but without a solution. On iOS 15 everything works fine, but on iOS 16 the app crashes with the following error:
SwiftUI/UIViewControllerRepresentable.swift:332: Fatal error:
UIViewControllerRepresentables must be value types: InterstitialAdView
2022-11-20 15:34:32.811071+0300 MyApp[38437:1156286]
SwiftUI/UIViewControllerRepresentable.swift:332: Fatal error:
UIViewControllerRepresentables must be value types: InterstitialAdView
As I understand, to implement the UIViewControllerRepresentable protocol, you must use a struct, but the NSObject and GADFullScreenContentDelegate protocols can only be applied in a class. Question: how can the code be modified to meet the above requirements? I am using the following code (original from here):
// InterstitialAdView
final class InterstitialAdView: NSObject, UIViewControllerRepresentable, GADFullScreenContentDelegate {
//Here's the Ad Object we just created
let interstitialAd = InterstitialAd.shared.interstitialAd
#Binding var isPresented: Bool
var adUnitId: String
init(isPresented: Binding<Bool>, adUnitId: String) {
self._isPresented = isPresented
self.adUnitId = adUnitId
super.init()
interstitialAd?.fullScreenContentDelegate = self //Set this view as the delegate for the ad
}
//Make's a SwiftUI View from a UIViewController
func makeUIViewController(context: Context) -> UIViewController {
let view = UIViewController()
//Show the ad after a slight delay to ensure the ad is loaded and ready to present
DispatchQueue.main.asyncAfter(deadline: .now() + .milliseconds(1)) {
self.showAd(from: view)
}
return view
}
func updateUIViewController(_ uiViewController: UIViewController, context: Context) {
}
//Presents the ad if it can, otherwise dismisses so the user's experience is not interrupted
func showAd(from root: UIViewController) {
if let ad = interstitialAd {
ad.present(fromRootViewController: root)
} else {
self.isPresented.toggle()
}
}
func adDidDismissFullScreenContent(_ ad: GADFullScreenPresentingAd) {
//Prepares another ad for the next time view presented
InterstitialAd.shared.loadAd(withAdUnitId: adUnitId)
//Dismisses the view once ad dismissed
isPresented.toggle()
}
}