Authenticating user with facebook on iOS without UIWebView

Is there a way to authenticate a user with facebook in开发者_如何学Python the background using id/pass he entered in configuration screen? I mean authentication without the usage of UIWebView, but using some kind of Http client to retrieve auth token (OAuth 2.0 preferably)

The OAuth site lists several options for Objective-C, including MPOAuthConnection. You could probably tweak it to use with ASIHTTPRequest or similar to place a request with credentials.