title: How can I find out if AdMob has loaded an ad?
body: <p>I'm using <code>AdMob</code> as backup for <code>iAd</code>, but I'm having trouble finding out if <code>AdMob</code> delivers..
  With <code>iAd</code> I could check with <code>isBannerLoaded</code> or something, but not with <code>AdMob</code>..
  Anyway, I've got everything working now, except when theres no internet connection!
  When <code>iAd</code> fails to load an ad, and calls <code>didFailToReceiveAdWithError</code>, then I initiate the <code>AdMob</code>. When testing this, the Error-reason I'm using is "no internet connection", but AdMob doesn't call it's own <code>didFailToReceiveAdWithError</code>. It seems like no internet connection isn't an error for AdMob (<code>GADBannerView*</code>)</p>
  
  <p>How can I tell if GADBannerView fails?</p>
  
  <p><strong>EDIT</strong></p>
  
  <p>Okay, so here's basically code I have:</p>
  
  <pre><code>-(void)viewDidLoad
  {
      [super viewDidLoad];
      [self initiAdBanner];
      [self initAdMobBanner];
  }
  
  -(void)initAdMobBanner{}//initiates variable adMobBannerView(GADBannerView)
  -(void)initiAdBanner{}//initiates variable iAdBannerView(ADBannerView)
  
  -(void)hideBanner:(UIView*)banner{} //hides banner if visible
  -(void)showBanner:(UIView*)banner{} //shows banner if hidden
  
  //blah blah
  
  -(void)adView:(GADBannerView*)banner didFailToReceiveAdWithError:(GADRequestError*)error
  {
      //Never gets called, should be called when both iAd and AdMob fails.
      NSLog(@"AdMobBanner failed.");
      [self hideBanner:banner];
  }
  
  -(void)bannerView:(ADBannerView*)banner didFailToReceiveAdWithError:(NSError*)error
  {
      //If iAd fails, due to no internet connection or whatever, then it calls this.
      [self adMobRequest];
      [self hideBanner:iAdBannerView];
      [self showBanner:adMobBannerView];
  } 
  </code></pre>
  
  <p>When iAd fails and calls for <code>(ADBannerView*)didFailToReceiveAdWithError</code>, I start the AdMob, but when theres no internet connection, the AdMob won't call the <code>(GADBannerView*)didFailToReceiveAdWithError</code>.
  Why?</p>