How do you keep a user persistently logged in on an iPhone app?

You can use the iOS KeyChain to securely store credentials as well. This can be simplified by using this code found on github ( https://github.com/ldandersen/scifihifi-iphone/tree/master/security ) , with some basic instructions found at http://gorgando.com/blog/tag/sfhfkeychainutils.

That depends on the context of your application. If you authenticate against another API, the supplier of the API usually provides you with some sort of authentication key which might expire after a certain time. You would store this key in your application once the user performs the authentication step and reuse it for every request.

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