如何在iAd失败调解后实施AdMob

Question

我实现了iAds在bannerViewDidLoadAd方法中工作，然后我实现了AdMob在didFailToReceiveAdWithError方法中工作。但是，在同一个视图控制器上，我有一个GameOver方法，我希望广告出现。只有iAd加载GameOver方法，AdMob没有。此外，当iAds加载失败时，AdMob无法加载。在我看来，因为我以编程方式将GADBannerView添加到故事板上，游戏永远不会响应_bannerView.hidden = YES或NO。由于我在Xcode中添加了来自Object Library的ADBannerView，因此游戏只响应iAdBanner.hidden = YES或NO。为什么AdMob不响应以编程方式添加的广告横幅？

-(void)bannerViewDidLoadAd:(ADBannerView *)banner{
  [UIView beginAnimations:nil context:nil];
  [UIView setAnimationDuration:0];
  [iAdBanner setAlpha:1];
   iAdBanner.hidden=NO;
 [UIView commitAnimations];
 [self.iAdBanner setDelegate:self];
 _bannerView = [[GADBannerView alloc] initWithAdSize:kGADAdSizeSmartBannerPortrait];
  }

 -(void)bannerView:(ADBannerView *)banner didFailToReceiveAdWithError:(NSError *)error{
 [UIView beginAnimations:nil context:nil];
 [UIView setAnimationDuration:0];
 [iAdBanner setAlpha:0];
 iAdBanner.hidden=YES;
 [UIView commitAnimations];
  _bannerView = [[GADBannerView alloc] initWithAdSize:kGADAdSizeSmartBannerPortrait]; 

  _bannerView=[[GADBannerView alloc]initWithFrame:CGRectMake(0, 0, 320, 50)];
   self.bannerView.adUnitID=@"UNIT-ID";
   self.bannerView.rootViewController=self;
   [self.view addSubview:self.bannerView];  
   self.bannerView.delegate = self;   
   GADRequest *request =[GADRequest request];
   request.testDevices= @[ GAD_SIMULATOR_ID ];  
   [self.bannerView loadRequest:request];

     }