title: How to save data from version to version in iphone app development?
body: <p>I'm having a problem for my app, a Chinese-English dictionary. I'm now adding a wordbook for it, and try to save the contents of it to a plist every time users exit the app. But now I find that as my app updates, all these data will get lost because the path of the app is changed.</p>
  
  <p>I'm now working for a company so the app will keep releasing new versions, and how can I save the data from version to version?</p>