Say I have a widget that requires user authentication to display relevant information, and the moment user is picking my widget in the Widget Gallery the authentication is not yet established. In this case, what's the recommendation on widget UI. Should the widget show the placeholder UI, or a UI urging user to login, or a UI using sample data?
You can think of the widget gallery as being the equivalent of App Store screenshots for your widget. It should show what the user would see in typical usage. Ideally it would show exactly the same view as what the user would get once they add the widget to their home screen (or Notification Center), but in cases where that's not possible (such as needing login) it's best to show sample data.
