title: How do you present a sequence of UIAlertControllers?
body: <p>I have an app that can download many publications from a server at once. For each publication that already exists in the app, I want to prompt the user if he wants to overwrite the existing version.</p>
  
  <p>Is there any clean way to present UIAlertControllers so that when the user has answered one, the app presents the next one?</p>