title: iAd ADBannerView changes the size of SKScene
body: <p>I feel like I've looked everywhere and I can't figure it out. I'm trying to show a banner ad at the bottom of my menu screen like so:</p>
  
  <p><img src="https://i.stack.imgur.com/Nikacm.png" alt="enter image description here"></p>
  
  <p>But after I display my "game over" screen (which also has an ad on it) The main menu looks like this:</p>
  
  <p><img src="https://i.stack.imgur.com/R4491m.png" alt="enter image description here"></p>
  
  <p>Any help would be greatly appreciated. I call the ads by using the <code>NSNotificationCenter</code> and the <code>GameOver</code> SKScene calls <code>presentScene</code> to get back to the Main Menu. I assume it has something to do with frame size in that call, but I do not know how to fix it.</p>
  
  <p>Inside my GameViewController:</p>
  
  <pre><code>override func viewDidLoad() {
      //code
      loadAds()
      NSNotificationCenter.defaultCenter().addObserver(self, selector: "showiAdBanner", name: "showiAdBanner", object: nil)
      NSNotificationCenter.defaultCenter().addObserver(self, selector: "hideiAdBanner", name: "hideiAdBanner", object: nil)
  }
  
  func bannerViewDidLoadAd(banner: ADBannerView!) {
      adBannerView.hidden = false
  }
  
  func bannerView(banner: ADBannerView!, didFailToReceiveAdWithError error: NSError!) {
      adBannerView.hidden = true
  }
  
  func loadAds(){
      adBannerView = ADBannerView(frame: CGRect.zeroRect)
      adBannerView.center = CGPoint(x: adBannerView.center.x, y: view.bounds.size.height - adBannerView.frame.size.height / 2)
      adBannerView.delegate = self
      adBannerView.hidden = true
      adBannerView.layer.zPosition = 10
      view.addSubview(adBannerView)
  }
  
  func showiAdBanner() {
      if adBannerView.bannerLoaded {
          adBannerView.hidden = false
      }
  }
  
  func hideiAdBanner() {
      adBannerView.hidden = true
  }
  </code></pre>
  
  <p>Inside SpriteKit "Start" Scene:</p>
  
  <pre><code>override func didMoveToView(view: SKView) {
      //code
      NSNotificationCenter.defaultCenter().postNotificationName("showiAdBanner", object: nil)
  }
  </code></pre>