title: Detect when a document has been uploaded or modified in iCloud on iOS app
body: <p>I am looking for a simple way to detect if a document has been uploaded or modified in iCloud.
  The solution I have found for the moment is to poll at given interval the /private/var/Mobile Doc... folder relative to the application and containing iCloud docs, and see if a new document has a recent modified date.</p>
  
  <p>It basically works, but I would like to know if there is some kind of NSNotification, as it is  for example in CoreData+iCloud, or if there are other ways I don't know.</p>
  
  <p>Thanks.</p>