An OAuth2 example for Mac OS X & iOS (Cocoa & Cocoa touch) in Objective C to obtain access token from OneHub.

This example is based on the OAuth2 spec. It implements the native application profile and supports the end-user authorization endpoint via an internal or an external user-agent. Furthermore it also supports the user credentials flow by prompting the end-user for their username and password and use them directly to obtain an access token from OneHub.

Here is the basic implementation of this example. You just need to update ViewController.m file as below:

#define TOKEN_URL @"https://ws-api.onehub.com/oauth/token" // already defined
#define CLIENT_ID @"ENTER CLIENT ID HERE" // enter your client id
#define CLIENT_SECRET @"ENTER CLIENT SECRET HERE" // enter your client secret
#define USERNAME @"ENTER USERNAME HERE" // enter your username/email
#define PASSWORD @"ENTER PASSWORD HERE" // enter your password
#define REDIRECT_URI @"https://localhost" // already defined
#define GRANT_TYPE @"password" // already defined