let currentUser = PFUser.currentUser()?.username

        if  currentUser == nil {
            user.signUpInBackgroundWithBlock() {(success, error) -> Void in
                if success {
                    print("successfully saved")
                } else {

                    do
                    {
                        try PFUser.logInWithUsername(username, password: emailData)
                    }
                    catch
                    {
                        print(error)
                    }
                    self.updateUI()
                }
            }
        }
    }


func updateUI () {

    if let userFirstName = PFUser.currentUser()?["firstName"] as? String    {
        firstNameLabel.text = userFirstName
    } else {
        self.firstNameLabel.text = ""
    }

    if let userLastName = PFUser.currentUser()?["lastName"] as? String  {
        lastNameLabel.text = userLastName
    } else {
        self.lastNameLabel.text = ""
    }

    if let userPicture = PFUser.currentUser()?["picture"] as? String,
        url = NSURL(string: userPicture),
        data = NSData(contentsOfURL: url),
        image = UIImage(data: data)
    {
        profilePictureImageView?.image = image

    }
    else {
        self.profilePictureImageView.image = nil
    }
}