title: Importing PDF files to app
body: <p>I am trying to import a PDF file from other applications, such as mail, but I'm not sure exactly what I should be looking for. I want my user to be able to tap on the share button in a PDF and my app to be listed there as a place that can accept them, such as "Copy to iBooks"</p>
  
  <p>Any good tutorials? Or suggestions as to what I should look for?</p>
  
  <p>Preferably in Swift</p>
  
  <p>Thanks!</p>