There are many different reasons why you would want to share app data through E-mail with users, for one thing it could be used as a way to import data collected in other applications, another could simply be because you want to include a system for users to safely backup data used within your app.
There are several steps involved in the process, for one you need to modify the info.plist file to allow the file type used for storing your app’s data, and you will also need to know how to import data from the E-mails, and create that data used for sending the E-mails.
Ray Wenderlich has put together a great step-by-step tutorial on doing exactly this, check out:
How To Import And Export Data Via Email In Your iOS App
Looks like some very useful, and not too difficult (at least with Ray’s tutorial!) functionality to add into your apps.
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