title: DocumentInteractionController Navigation Bar Color
body: <p>In my iOS application, I am using the DocumentInteractionController to preview the .csv document.</p>
  
  <pre><code>    self.documentController = [UIDocumentInteractionController interactionControllerWithURL:fileLocation];
      [self.documentController setDelegate:self];
      [self.documentController presentPreviewAnimated:YES];
  </code></pre>
  
  <p>However, I am finding that the navigation bar is completely transparent. The back button is white, so it is not visible due to the white background.</p>
  
  <p><img src="https://i.stack.imgur.com/XpO0A.png" width="320"></p>
  
  <p>Note that I have styled the navigation bar in the AppDelegate:</p>
  
  <pre><code>[[UINavigationBar appearance] setBarTintColor:[UIColor colorWithRed:0/255.0f green:138/255.0f blue:188/255.0f alpha:1.0f]];
  [[UINavigationBar appearance] setTintColor:[UIColor whiteColor]];
  [[UINavigationBar appearance] setTitleTextAttributes:@{NSFontAttributeName:[UIFont fontWithName:@"DINPro-Bold" size:17]}];
  [[UINavigationBar appearance] setBackgroundImage:[[UIImage alloc] init] forBarPosition:UIBarPositionAny barMetrics:UIBarMetricsDefault];
  [[UINavigationBar appearance] setShadowImage:[UIImage imageNamed:@"shadow"]];
  [[UITabBar appearance] setSelectedImageTintColor:[UIColor whiteColor]];
  [[UITabBar appearance] setTintColor:[UIColor whiteColor]];
  [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent animated:NO];
  </code></pre>
  
  <p>Essentially, my question is how can I make the appearance of the navigation bar in the DocumentInteractionController View Controller consistent with the appearance of the navigation bar throughout the entire app (or at least visible!).</p>