SwiftDDP now supports login with Facebook, Twitter, Google and Github.
It works with the standard, unmodified Meteor accounts packages: accounts-facebook, accounts-google, etc.
Usage is simple:
Meteor.loginWithFacebook(FACEBOOK_CLIENT_ID, viewController: self)
FACEBOOK_CLIENT_ID is the app id,
self is the current view controller which inherits from UIViewController.
Calling this method invokes a modal view that handles the OAuth dance, grabs your credentials and logs you into your server.
Comments, feedback, pull requests welcome.