Do you mean something like on drawing apps, save files in an internal folder inside of the app so you can load the file you saved next time you open the folder, if so, I would wait for IOS Keyboard input on the roadmap so the player can name the file they want to save, beyond that, no idea.
If you're saying a way to have multiple people play on their own files, what you need to do is use different Keys when you do save attribute for the various save file, e.g. save attribute self.levelscomplete with key game 1 when in the first save file, then game 2 when in the second, and so on. Then you'll want to load these attributes with the same keys each time you open each save file.
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I hope that makes sense.
Asymptoteell