title: Show Admob Native Ads Programmatically with Objective C
body: <p>The official guide is using storyboard
  <a href="https://firebase.google.com/docs/admob/ios/native-express" rel="nofollow noreferrer">https://firebase.google.com/docs/admob/ios/native-express</a></p>
  
  <p>I am trying to load the native ads in the <code>header</code> of <code>UITableView</code> without using storyboard.</p>
  
  <p>What I have tried:</p>
  
  <pre><code>    @property (nonatomic, strong) GADNativeExpressAdView *nAdView;
  ...
  - (void)viewDidLoad
  {
      [super viewDidLoad];
          _nAdView.adUnitID = @"ca-app-pub-mycode";
          _nAdView.rootViewController = self;
  }
  ...
  - (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {
          GADRequest *request = [GADRequest request];
          [self.nAdView loadRequest:request];
          return _nAdView;
  }
  </code></pre>
  
  <p>But nothing happened.</p>