问题
What happens when I update an app that has some files stored in the Documents folder? I need those files to be kept in that folder so the updated app will be able to use them. But it doesn't seem to happen. Is there anyway I can manage to save all my files?
回答1:
Your documents will stay where they are - unless the user deletes the app before updating (but that wouldn't be an update..).
来源：https://stackoverflow.com/questions/9311748/when-you-update-an-ios-app-what-happens-to-the-documents-folder-contents