I'm just writing the planning for an iPhone app I'm making to manage your repositories on GitHub. This is for a University assignment.
Can I OAuth from Objective-C and how would it work? Would it just be a 'Login with GitHub' button to load an in-built browser or would it be a username / password combo?
Am I able to get the resulting token back from this and store it using Core Data until the user forcibly logs out?
You definitely can - it's possible to either go through GitHub's web based authentication flow, or use their 'non web application' alternative. Both are detailed here .
However, a number of developers have already created GitHub API libraries for various languages, including this one for Objective-C that is listed on GitHub's own libraries page. You may find it a lot easier, and you could always modify it (and hopefully contribute your changes back!) if you need to do things that the library doesn't support.
You can have a look at the authentication code I'm using in iOctocat: https://github.com/dennisreimann/ioctocat
Under the hood I'm using AFNetworking with its OAuth2 extension, which makes most of the communication very easy. The custom stuff the app is doing can be found here: https://github.com/dennisreimann/ioctocat/blob/master/Classes/GHBasicClient.m
Hope this helps you :)
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