If you put the UIDocumentInteractionController onto a UINavigationController it will automatically take the color its navbar. This is probably your root view navcontroller.
You do this with the documentInteractionControllerViewControllerForPreview method:
- (UIViewController *) documentInteractionControllerViewControllerForPreview: (UIDocumentInteractionController *) controller{ // Use the rootViewController here so that the preview is pushed onto the navbar stack MyAppDelegate *appDelegate = (MyAppDelegate *)[[UIApplication sharedApplication] delegate]; return appDelegate.window.rootViewController;}