login.swift

///--------------------------------------
/// CustomLogInViewController.swift
///--------------------------------------

class CustomLogInViewController: PFLogInViewController {
    var backgroundImage : UIImageView!

    override func viewDidLoad() {
        super.viewDidLoad()

        // set our custom background image
        backgroundImage = UIImageView(image: UIImage(named: "Icon"))
        backgroundImage.contentMode = UIViewContentMode.ScaleAspectFill
        self.logInView!.insertSubview(backgroundImage, atIndex: 0)

        // remove the parse Logo
        let logo = UILabel()
        logo.text = "Butterfly"
        logo.textColor = UIColor.whiteColor()
        logo.font = UIFont(name: "Pacifico", size: 70)
        logo.shadowColor = UIColor.lightGrayColor()
        logo.shadowOffset = CGSizeMake(2, 2)
        logInView?.logo = logo

    }

    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        backgroundImage.frame = CGRectMake( 0,  0,  self.logInView!.frame.width,  self.logInView!.frame.height)
    }
}

///--------------------------------------
/// Using it
///--------------------------------------

func presentController() {
  let logInViewController = CustomLogInViewController()
  logInViewController.fields = [.Facebook, .Default]
  logInViewController.delegate = self
  logInViewController.emailAsUsername = false

  logInViewController.facebookPermissions = ["public_profile", "email", "user_friends", "user_education_history", "user_birthday"]
  logInViewController.signUpController?.delegate = self

  presentViewController(logInViewController, animated: false, completion: nil)
}