class AuthorizationForm: Form {
    
    let email = Field<String>()
        .add(filter: Filters.Trim())
        .add(validator: Validators.Required())
        .add(validator: Validators.Email())
    
    let password = Field<String>()
        .add(filter: Filters.Trim())
        .add(validator: Validators.Required())
    
    let code = Field<Int>()
    
    override func elements() -> [Element] {
        return [email, password, code] + super.elements()
    }
    
}

class ViewController: UIViewController {

    let form = AuthorizationForm()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // bind variables
        form.email.bind(to: emailTextField)
        form.password.bind(to: passwordTextField)
        form.code.bind(to: codeTextField)
    }
    
}

if form.isValid() {
    form.email.value()
    form.password.value()
    form.code.value(default: 3483)
} else {
    //form.errors
}