使用用户令牌、rest/rails和keychain帮助使用iOS身份验证。

I have a Rails application (irrelevant, I know) and I want to authenticate an iOS app against the Rails app, and persist the authentication so future requests to the Rails API work without re-authenticating each request. Conceptually, here's what I want to do... I'm not sure if this is the best approach, though.I have a Rails application (irrelevant, I know)