override func viewDidLoad() {
    super.viewDidLoad()
    signUpPressed.isEnabled = false
    nameTextField.addTarget(self, action: #selector(editingChanged(_:)), for: .editingChanged)
    emailTextField.addTarget(self, action: #selector(editingChanged(_:)), for: .editingChanged)
    passwordTextField.addTarget(self, action: #selector(editingChanged(_:)), for: .editingChanged)
}

@objc func editingChanged(_ textField: UITextField) {
    if textField.text?.characters.count == 1 {
        if textField.text?.characters.first == " " {
            textField.text = ""
            return
        }
    }
    guard
        let name = nameTextField.text, !name.isEmpty,
        let email = emailTextField.text, !email.isEmpty,
        let password = passwordTextField.text, !password.isEmpty,
        let image = profileImageView.image, !image == nil -> ERROR

        else {
            signUpPressed.isEnabled = false
            return
    }
    signUpPressed.isEnabled = true
}