Admob

please note: i am not professional code programing :)

Is there any error in the AdMob code, or any violation of AddMob ads, or any error in its combination?

//
// ViewController.swift
// المعلم الالكتروني الشامل
//
// Created by Majeed Raza on 12/11/20.
//

import UIKit
import WebKit
import GoogleMobileAds


class ViewController: UIViewController {

  @IBOutlet weak var backButton: UIButton!
  @IBOutlet weak var webView: WKWebView!
  @IBOutlet weak var bannerContainerView: UIView!
  @IBOutlet weak var bannerHeightConstraints: NSLayoutConstraint!

  var bannerView: GADBannerView!
  var interstitial: GADInterstitial!

  override func viewDidLoad() {
    super.viewDidLoad()
    createAndLoadInterstitial()
    webView.navigationDelegate = self
     = GADAdSizeFromCGSize(CGSize(width: 300, height: 50))
     
    bannerView = GADBannerView(adSize: kGADAdSizeBanner)
    addBannerViewToView(bannerView)
    bannerView.adUnitID = "ca-app-pub-8177765238464378/5568600849"
    bannerView.rootViewController = self
    bannerView.load(GADRequest())
    bannerView.delegate = self
    addBannerViewToView(bannerView)
    // Do any additional setup after loading the view.
//    webView.load(URLRequest.init(url: URL.init(string:
     
    //let url = Bundle.main.url(forResource: "index", withExtension: "html")
    // webView.load(URLRequest.init(url: url!))
     
    do {
      guard let filePath = Bundle.main.path(forResource: "index", ofType: "html")
          else {
            print ("File reading error")
            return
          }
          let baseUrl = URL(fileURLWithPath: filePath)
          webView.loadFileURL(baseUrl, allowingReadAccessTo: baseUrl)
      } catch {
        print ("File HTML error")
      }

  }
  func addBannerViewToView( bannerView: GADBannerView) {
   bannerView.translatesAutoresizingMaskIntoConstraints = false
   bannerContainerView.addSubview(bannerView)
    // bannerContainerView.frame = CGRect.init(x: 0, y: 0, width: UIScreen.main.bounds.width, height: 50)
   }

  @IBAction func backButtonTapped( sender: Any) {
    webView.goBack()
  }
   
  func createAndLoadInterstitial() {
   interstitial = GADInterstitial(adUnitID: "ca-app-pub-8177765238464378/9061478519")
   interstitial.delegate = self
   interstitial.load(GADRequest())
  }

}

extension ViewController: GADBannerViewDelegate {
  func adViewDidReceiveAd( bannerView: GADBannerView) {
   print("adViewDidReceiveAd")
    bannerView.alpha = 0

    bannerHeightConstraints.constant = 50
    UIView.animate(withDuration: 0.1) {
      self.view.layoutIfNeeded()
      self.bannerView.alpha = 1

    }
  }

  /// Tells the delegate an ad request failed.
  func adView( bannerView: GADBannerView,
    didFailToReceiveAdWithError error: GADRequestError) {
   print("adView:didFailToReceiveAdWithError: \(error)")
    bannerHeightConstraints.constant = 0
    self.bannerView.alpha = 1

    UIView.animate(withDuration: 0.1) {
      self.view.layoutIfNeeded()
      self.bannerView.alpha = 0

    }

  }

  /// Tells the delegate that a full-screen view will be presented in response
  /// to the user clicking on an ad.
  func adViewWillPresentScreen( bannerView: GADBannerView) {
   print("adViewWillPresentScreen")
  }

  /// Tells the delegate that the full-screen view will be dismissed.
  func adViewWillDismissScreen( bannerView: GADBannerView) {
   print("adViewWillDismissScreen")
  }

  /// Tells the delegate that the full-screen view has been dismissed.
  func adViewDidDismissScreen( bannerView: GADBannerView) {
   print("adViewDidDismissScreen")
  }

  /// Tells the delegate that a user click will open another app (such as
  /// the App Store), backgrounding the current app.
  func adViewWillLeaveApplication( bannerView: GADBannerView) {
   print("adViewWillLeaveApplication")
  }
}

extension ViewController: GADInterstitialDelegate {
  func interstitialDidReceiveAd( ad: GADInterstitial) {
   print("interstitialDidReceiveAd")
  }

  /// Tells the delegate an ad request failed.
  func interstitial( ad: GADInterstitial, didFailToReceiveAdWithError error: GADRequestError) {
   print("interstitial:didFailToReceiveAdWithError: \(error.localizedDescription)")
  }

  /// Tells the delegate that an interstitial will be presented.
  func interstitialWillPresentScreen( ad: GADInterstitial) {
   print("interstitialWillPresentScreen")

  }

  /// Tells the delegate the interstitial is to be animated off the screen.
  func interstitialWillDismissScreen( ad: GADInterstitial) {
   print("interstitialWillDismissScreen")
    self.createAndLoadInterstitial()

  }

  /// Tells the delegate the interstitial had been animated off the screen.
  func interstitialDidDismissScreen( ad: GADInterstitial) {
   print("interstitialDidDismissScreen")

  }

  /// Tells the delegate that a user click will open another app
  /// (such as the App Store), backgrounding the current app.
  func interstitialWillLeaveApplication( ad: GADInterstitial) {
   print("interstitialWillLeaveApplication")
    self.createAndLoadInterstitial()

  }
}

extension ViewController: WKNavigationDelegate {
  func webView( webView: WKWebView, didFinish navigation: WKNavigation!) {
    if (webView.url?.absoluteString.contains("f1"))! || (webView.url?.absoluteString.contains("f2"))! {
      if self.interstitial.isReady {
        self.interstitial.present(fromRootViewController: self)
      }

    }
  }
}