title: Admob display issue in ios
body: <p>i'm working on an app in which i'm integrating admob. I have given my ad unit and App Id but the ads are not displaying. This is what i code in appdelegate,</p>
  
  <pre><code> [GADMobileAds configureWithApplicationID:@"ca-app-pub-6419920332120857~7417324780"];
  </code></pre>
  
  <p>This is how i coded in VC class,</p>
  
  <pre><code>//Admob Banner
  bannerView_ = [[GADBannerView alloc]initWithFrame:CGRectMake(0, 20, 320, 70)];
  NSLog(@"%@",bannerView_);
  bannerView_.adUnitID = @"ca-app-pub-6419920332120857/8171578220";
  GADRequest *request = [GADRequest request];
  bannerView_.rootViewController = self;
  [self.view addSubview:bannerView_];
  [bannerView_ loadRequest:[GADRequest request]];
  
  request.testDevices = @[ @"326e918015806f8d65a43e86f9e6e939" ];
  
  NSLog(@"%@",request);
  </code></pre>