title: how to upload files to iphone app
body: <p>For some app like MyPDFs, when connect to mac ,
  you can upload files into the app via itunes.</p>
  
  <p>in itunes, There is "File Sharing", and I also want to share files with my App.</p>
  
  <p>I'd like to know how to do it~</p>
  
  <p>thanks~</p>