App Updates, NSURL, and Documents Directory

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You should use relative URLs to store references to files. The absolute URL is likely to change after an app update

Files Saved During App Updates

When a user downloads an app update,
iTunes installs the update in a new app directory. It then moves the
user’s data files from the old installation over to the new app
directory before deleting the old installation. Files in the following
directories are guaranteed to be preserved during the update process:

  • Application_Home/Documents
  • Application_Home/Library

Although files
in other user directories may also be moved over, you should not rely
on them being present after an update.

https://developer.apple.com/library/ios/#DOCUMENTATION/iPhone/Conceptual/iPhoneOSProgrammingGuide/PerformanceTuning/PerformanceTuning.html

Thx to the sandbox, the application home is also the user home. So it is possible to use the unix tilde which is a short hand to the user home, i.e. ~/Documents, ~/Library and so on.

Use -[NSString stringByAbbreviatingWithTildeInPath] to turn a full path into a relative ~ path. And reverse it with -[NSString stringByExpandingTildeInPath].

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