[iOS] How can I hide navigation bar while using Xamarin.Forms?

I tried the following but it didn't work:

    // In page
    protected override void OnAppearing ()
    {
      base.OnAppearing ();
      DependencyService.Get<INavigationBarToggler> ().HideNavigation (this);
    }

Then in the iOS implementation, I called NavigationController.SetNavigationBarHidden (hidden: false, animated: true);