Swift email add check

I am quite new to SWIFT. I am trying the following checking method on my demo app. What is that I am doing wrong? Because the else if is never kicking in

class SignupClass: UIViewController {

    @IBOutlet var nameActualUser: UITextField!
    @IBOutlet var prefUsername: UITextField!
    @IBOutlet var emailSignup: UITextField!
    @IBOutlet var passSignup: UITextField!
    @IBOutlet var phoneSignup: UITextField!

    @IBAction func lawyerSignup(sender: AnyObject) {


       hideRegistrationText()
    }

    @IBOutlet var regNumberSignup: UITextField!


    @IBAction func validateEmail(sender: AnyObject) {

        if emailSignup.text!.isEmpty {

            let myAlert = UIAlertController(title: "Notification", message: "Enter email address", preferredStyle: UIAlertControllerStyle.Alert);

            let okAction = UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default){(ACTION) in
                print("Ok Button Tapped");
            }

            myAlert.addAction(okAction)

            self.presentViewController(myAlert, animated: true, completion: nil);
            print("enter email address") //prompt ALert or toast
        }
        else if validate(emailSignup.text!)
        {

            let myAlert = UIAlertController(title: "Notification", message: "Invalid email addresses", preferredStyle: UIAlertControllerStyle.Alert);

            let okAction = UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default){(ACTION) in
                print("Ok Button Tapped");
            }

            myAlert.addAction(okAction)

            self.presentViewController(myAlert, animated: true, completion: nil);
            print("Invalid email address") // prompt alert for invalid email
        }


    }

    @IBOutlet var lawyerSwitch: UISwitch!

    @IBAction func signupButton(sender: AnyObject) {
        validateEmail(emailSignup.text!)

        signupMethod()

    }





    func validate(emailAdd: String) -> Bool
    {
        let REGEX: String
        REGEX = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,6}"
        return NSPredicate(format: "SELF MATCHES %@", REGEX).evaluateWithObject(emailAdd)
    }


    func hideRegistrationText()
    {
        if lawyerSwitch.on
        {
             regNumberSignup.hidden = false
        }
        else
        {
            regNumberSignup.hidden = true
        }

    }

    func signupMethod()
    {
        let user = PFUser()
        user.username = prefUsername.text
        user.password = passSignup.text
        user.email = emailSignup.text

        user["name"] = nameActualUser.text
        user["phone"] = phoneSignup.text

        user.signUpInBackgroundWithBlock{
            (succeeded: Bool, error:NSError?) -> Void in
            if let _ = error{
                let myAlert = UIAlertController(title: "Notification", message: error!.localizedDescription, preferredStyle: UIAlertControllerStyle.Alert);

                let okAction = UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default){(ACTION) in
                    print("Ok Button Tapped");
                }

                myAlert.addAction(okAction)

                self.presentViewController(myAlert, animated: true, completion: nil);            }
            else
            {
                let myAlert = UIAlertController(title: "Notification", message: "Succesfully Signed Up!", preferredStyle: UIAlertControllerStyle.Alert);

                let okAction = UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default){(ACTION) in
                    print("Ok Button Tapped");
                }

                myAlert.addAction(okAction)

                self.presentViewController(myAlert, animated: true, completion: nil);

            }

        }
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        regNumberSignup.hidden = true

        nameActualUser.text = "werewdfsd"
        prefUsername.text = "edfvccer"
        //emailSignup.text = ""
        passSignup.text = "234324"
        phoneSignup.text = "1231243"



        // Do any additional setup after loading the view.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    } }