SwiftUI - Google AdMob interstitial not showing in onAppear

Question

I am trying to show an interstitial ad from google AdMob on appearing, but It Does not show up and it says "not ready" in the console. I have checked out many other tutorials and stack overflow pages on it but haven't found the answer. Can anyone help me? Here is my code:

struct ContentView: View {
@State var interstitial: GADInterstitial!
var body: some View{
    Text("Some Text").onAppear(perform: {
        self.interstitial = GADInterstitial(adUnitID: "ca-app-pub-3940256099942544/4411468910")
        let req = GADRequest()
        self.interstitial.load(req)


                if self.interstitial.isReady{
                        let root = UIApplication.shared.windows.first?.rootViewController
                        self.interstitial.present(fromRootViewController: root!)
                    }else {
                    print("not ready")
                }



    })
}
}

Answer 1

The GADInterstitial.load is asynchronous operation and don't wait till ad is loaded, so you have to use delegate if you want to show add immediately after load.

Here is a possible solution

class MyDInterstitialDelegate: NSObject, GADInterstitialDelegate {

    func interstitialDidReceiveAd(_ ad: GADInterstitial) {
        if ad.isReady{
            let root = UIApplication.shared.windows.first?.rootViewController
            ad.present(fromRootViewController: root!)
        } else {
            print("not ready")
        }
    }
}

struct ContentView: View {
    @State var interstitial: GADInterstitial!
    private var adDelegate = MyDInterstitialDelegate()
    var body: some View{
        Text("Some Text").onAppear(perform: {
            self.interstitial = GADInterstitial(adUnitID: "ca-app-pub-3940256099942544/4411468910")
            self.interstitial.delegate = self.adDelegate

            let req = GADRequest()
            self.interstitial.load(req)
        })
    }
}