title: How to put Admob banner for iOS on bottom centre?
body: <p>I am using this code to put the banner ads on bottom left.    </p>
  
  <pre><code>CGPoint origin = CGPointMake(0.0,
                               self.view.frame.size.height -
                               CGSizeFromGADAdSize(kGADAdSizeBanner).height);
  bannerView_ = [[GADBannerView alloc] initWithAdSize:kGADAdSizeBanner
                                               origin:origin];
  </code></pre>
  
  <p>How to position the banner at bottom center?</p>