Common use of the account platform in iOS

Question

I would like to use the Accounts Framework in my application to use OAuth for Single Sign-On . What I found in the Apple documentation regarding the Account Directory is that the types of accounts for using the framework are limited to Facebook , Twitter , Sina Weibo and Tencent Weibo .

I do not want to integrate my application into any social network, I just want to process user credentials using OAuth for SSO . I do not want users to provide their Facebook / Twitter credentials for this (if they are ...). Is there any way to achieve this? It will be something like creating and accounting for my application and storing credentials for it, but it looks like the iOS SDK does not allow creating accounts for user or general types of accounts, is there an alternative?

Thank you in advance