title: How to add the iOS "Open In..." feature to an app
body: <p>I would like to know how to present the "Open In..." Action Sheet (iPhone) / Popover (iPad) from my app, preferably an IBAction</p>
  
  <p>I would hope that it'd be similar to declaring a file type then creating the view and opening the app selected by the user, but I know it is more complicated then that.</p>
  
  <p>I realize that a similar question has been asked on StackOverflow, but I cannot make sense of the answer that was accepted: <a href="https://stackoverflow.com/questions/9513783/how-to-use-open-in-feature-to-ios-app">How to use "open in..." feature to iOS app?</a>, and I have found some Apple Documentation on Document Interaction Programming. But, I can't really make sense of these.</p>