首次弹窗口内部导航

OAUIListViewController *toDoUIListController = [[OAUIListViewController alloc] initWithNibName:@"OAUIListViewController"bundle:nil];

         UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:toDoUIListController];

            [navigationController setNavigationBarHidden:YES];

            viewController = navigationController;