ios – Google AdsMob does not seem on my app simulator swift

please I’ve an issue. I added GoogleAdsMob in my utility nevertheless it does not seem anyplace. I used the code under, however to this point nothing. However it counts on the Google AdsMob facet however nothing seems in my App. Does anybody have an answer?

import GoogleMobileAds
import UIKit

class ViewController: UIViewController, GADBannerViewDelegate {

  /// The AdManager banner view.
  @IBOutlet weak var bannerView: GAMBannerView!

  override func viewDidLoad() {
    tremendous.viewDidLoad()
    print("Google Cell Adverts SDK model: (GADMobileAds.sharedInstance().sdkVersion)")
    bannerView.adUnitID = "/6499/instance/banner"
    bannerView.rootViewController = self
    bannerView.load(GAMRequest())
  }

  func bannerViewDidReceiveAd(_ bannerView: GADBannerView) {
    print("bannerViewDidReceiveAd")
  }

  func bannerView(_ bannerView: GADBannerView, didFailToReceiveAdWithError error: Error) {
    print("bannerView:didFailToReceiveAdWithError: (error.localizedDescription)")
  }

  func bannerViewDidRecordImpression(_ bannerView: GADBannerView) {
    print("bannerViewDidRecordImpression")
  }

  func bannerViewWillPresentScreen(_ bannerView: GADBannerView) {
    print("bannerViewWillPresentScreen")
  }

  func bannerViewWillDismissScreen(_ bannerView: GADBannerView) {
    print("bannerViewWillDIsmissScreen")
  }

  func bannerViewDidDismissScreen(_ bannerView: GADBannerView) {
    print("bannerViewDidDismissScreen")
  }
}