如何正确应用捕获代码中的错误？ Swift Xcode清洁架构

Question

我目前正在为注册屏幕实现一些代码（使用快速清洁的体系结构）-当按下注册按钮并且出现错误时，我将触发一些功能。我将粘贴以下代码以获取帮助：

import UIKit

protocol SignupFormErrorLogic {
    func showValidationError(_ message: String)
}

class SignupViewController: UIViewController, SignupFormErrorLogic {
    

    
    var interactor: SignupBusinessLogic?
    var router: (NSObjectProtocol & SignupRoutingLogic)?
 
    
    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
        setup()
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        setup()
    }
    

    
    private func setup() {
        let viewController = self
        let interactor = SignupInteractor()
        let router = SignupRouter()
        
        viewController.interactor = interactor
        viewController.router = router
        interactor.router = router
        interactor.viewController = viewController
        router.viewController = viewController
    }
    
    
    @IBOutlet var fullNameTextField: UITextField!
    @IBOutlet var emailTextField: UITextField!
    @IBOutlet var passwordTextField: UITextField!

    
    @IBAction func cancelButtonPressed(_ sender: Any) {
        self.dismiss(animated: true, completion: nil)
    }
    
    @IBAction func signupButtonPressed(_ sender: Any) {
        let request = Signup.Request(
            name: fullNameTextField.text!,
            email: emailTextField.text!,
            password: passwordTextField.text!
        )
        
        interactor?.createAccount(request: request)
    }
    
    func showValidationError(_ message: String) {
        let alertCtrl = UIAlertController(title: "Oops! An error occurred", message: message, preferredStyle: .alert)
        alertCtrl.addAction(UIAlertAction(title: "Ok", style: .cancel, handler: nil))
        self.show(alertCtrl, sender: self)
    }
}

当我运行模拟器时，输入要创建的帐户的详细信息，然后单击“注册”，它会触发我的错误请求，但我不知道问题出在哪里。我应该使用do / try / catch块找出问题吗？如果可以，我应该在哪里/如何使用它？

谢谢