title: Change NavigationBar background on UIDocumentInteractionController
body: <p>I have to pass a local PDF file (documents directory) from UIWebView to other apps (iBooks, Facebook Messenger, WhatsApp, ...).</p>
  
  <p>So i use UIDocumentInteractionController:</p>
  
  <pre><code>- (IBAction)shareButton:(id)sender
  {
      NSURL *url = [NSURL URLWithString:self.webView.request.URL.absoluteString];
  
      self.docController = [UIDocumentInteractionController interactionControllerWithURL:url];
      self.docController.delegate = self;
      [self.docController presentOpenInMenuFromBarButtonItem:sender animated:YES];
  }
  </code></pre>
  
  <p>If i select FB Messenger or WhatsApp it shows a ViewController. </p>
  
  <p>How can i change the NavigationBar appearance of this VC (background image/color, button tint)? Default white translucent would be nice.</p>
  
  <p>I set a NavigationBar background image in AppDelegate.</p>