Parse sign up not working properly in Swift 3

Question

I have a parse-server app deployed on Heroku and MongoDB. In my Swift 3 app I set a button called register which runs the sign up function:

@IBAction func SignUpBtn(_ sender: UIButton) {
    let user = PFUser()
    user.username = usernameTextField.text
    user.password = passwordTextField.text
    user.email = emailTextField.text
    user["nameandsurname"] = nameandsurnameTextField.text
    user.signUpInBackground {
        (succeeded: Bool, error: Error?) -> Void in

        if error != nil {
            print("error")
            self.errorLabel.text = "Please make sure the email has not already been used or try changing the username"
        } else {
            self.performSegue(withIdentifier: "signuptohome", sender: self)
        }
    }

When I press the button, even if the fields are blank, the button redirects to the home page anyways, letting the user use the app. How can I do I solve this?

Answer 1

My logic is as follows which works. Also make sure you don't have any Segues taking place that you slipped in and forgot in your storyboard.

//this checks 3 fields that they are filled and not empty
     if  passwordTextField.text == "" || emailTxt.text == "" || usernameTextField.text == ""{
            simpleAlert(mess: "You must fill all fields to sign up")
            self.hideHUD()


    } else {
        let user = PFUser()
        user.username = usernameTextField.text
        user.password = passwordTextField.text
        user.email = emailTextField.text

        user.signUpInBackground { (succeeded, error) -> Void in
            if error == nil {
                //success register not lets log him in!!
                PFUser.logInWithUsername(inBackground: self.usernameTextField.text!, password:self.passwordTextField.text!) { (user, error) -> Void in
                    if error == nil {
                      // Here you can go to your logged in or dashboard page!!
                        self.hideHUD()

                    } else {
                        //failed to log user in
                        self.simpleAlert(mess: "\(error!.localizedDescription)")
                        self.hideHUD()
                    }}
            // ERROR
            } else {
                //This will be the failed to register user
                self.simpleAlert(mess: "\(error!.localizedDescription)")
                self.hideHUD()
        }}
}