class ViewController: UIViewController {
    override func viewDidLoad() {
        let entrarViewController = EntrarViewController()
        self.presentViewController(entrarViewController, animated:true, completion: nil)
    }
}

class EntrarViewController : PFLogInViewController, PFLogInViewControllerDelegate {
    override func viewDidLoad() {
        self.delegate = self
    }
}

extension EntrarViewController {

    func logInViewController(logInController: PFLogInViewController, didFailToLogInWithError error: NSError?) {
        print("didFailToLogInWithError")
    }

    func logInViewController(logInController: PFLogInViewController, didLogInUser user: PFUser) {
        print("didLogInUser")
    }

    func logInViewControllerDidCancelLogIn(logInController: PFLogInViewController) {
        print("didCancelLogIn")
    }

    func logInViewController(logInController: PFLogInViewController, shouldBeginLogInWithUsername username: String, password: String) -> Bool {
        print("LogIn username = (username) password = (password)")
        return true
    }
}