ios - 未调用 AWS Cognito iOS 登录委托(delegate)方法 `didCompleteStepWithError `

Question

我在基于 swift 的 iOS 应用程序中实现 AWS Cognito 登录，但是委托(delegate)方法 didCompleteStepWithError 没有被触发。

CognitoLoginViewController

class CognitoLoginViewController: UIViewController, AWSCognitoIdentityPasswordAuthentication {

    @IBOutlet weak var txtEmail: UITextField!
    @IBOutlet weak var txtPassword: UITextField!

    var user: AWSCognitoIdentityUser?
    var pool: AWSCognitoIdentityUserPool?
    var passwordAuthenticationCompletion: AWSTaskCompletionSource<AWSCognitoIdentityPasswordAuthenticationDetails>?

    override func viewDidLoad() {
        super.viewDidLoad()
    }

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

    }

    //MARK: - IBAction
    @IBAction func login(_ sender: Any) {
        if ((self.txtEmail.text?.isEmpty)! || (self.txtPassword.text?.isEmpty)!) {
            let alertController = UIAlertController(title: "Missing information",
                                                    message: "Please enter a valid user name and password",
                                                    preferredStyle: .alert)
            let retryAction = UIAlertAction(title: "Retry", style: .default, handler: nil)
            alertController.addAction(retryAction)
            self.navigationController?.present(alertController, animated: true, completion: nil)
        } else {
            let authDetails = AWSCognitoIdentityPasswordAuthenticationDetails(username: self.txtEmail.text!, password: self.txtPassword.text!)
            self.passwordAuthenticationCompletion?.set(result: authDetails)
        }
    }

    @IBAction func signup(_ sender: Any) {
        let vc = CognitoSignUpViewController(nibName: "CognitoSignUpViewController", bundle: nil)
        navigationController?.pushViewController(vc, animated: true)
    }

    @IBAction func forgotPassword(_ sender: Any) {
        let vc = CognitoForgotPasswordViewController(nibName: "CognitoForgotPasswordViewController", bundle: nil)
        navigationController?.pushViewController(vc, animated: true)
    }


    //MARK: - AWSCognitoIdentityPasswordAuthentication delegate methods
    public func getDetails(_ authenticationInput: AWSCognitoIdentityPasswordAuthenticationInput, passwordAuthenticationCompletionSource: AWSTaskCompletionSource<AWSCognitoIdentityPasswordAuthenticationDetails>) {
        self.passwordAuthenticationCompletion = passwordAuthenticationCompletionSource
    }

    public func didCompleteStepWithError(_ error: Error?) {
        DispatchQueue.main.async {
            if let error = error as? NSError {
                let alertController = UIAlertController(title: error.userInfo["__type"] as? String,
                                                        message: error.userInfo["message"] as? String,
                                                        preferredStyle: .alert)
                let retryAction = UIAlertAction(title: "Retry", style: .default, handler: nil)
                alertController.addAction(retryAction)

                self.present(alertController, animated: true, completion:  nil)
            } else {
                self.txtEmail.text = nil
                //self.dismiss(animated: true, completion: nil)
            }
        }
    }
}

触发按钮点击并执行以下行。

let authDetails = AWSCognitoIdentityPasswordAuthenticationDetails(username: self.txtEmail.text!, password: self.txtPassword.text!)
self.passwordAuthenticationCompletion?.set(result: authDetails)

应用委托(delegate)

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?
    var rootNavigationController : UINavigationController?
    var loginViewController: CognitoLoginViewController?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        navigationInit()
        awsCognitoInit()
        return true
    }

    func application(_ application: UIApplication,
                     open url: URL, sourceApplication: String?, annotation: Any) -> Bool {
        return true
    }

    func awsCognitoInit(){
        let credentialsProvider = AWSCognitoCredentialsProvider(regionType: CognitoIdentityUserPoolRegion,
                                                                identityPoolId: CognitoIdentityUserPoolId)
        let serviceConfiguration = AWSServiceConfiguration(region: .USEast1,
                                                           credentialsProvider: credentialsProvider)
        let poolConfiguration = AWSCognitoIdentityUserPoolConfiguration(clientId: CognitoIdentityUserPoolAppClientId,
                                                                        clientSecret: CognitoIdentityUserPoolAppClientSecret,
                                                                        poolId: CognitoIdentityUserPoolId)
        AWSLogger.default().logLevel = .verbose
        AWSServiceManager.default().defaultServiceConfiguration = serviceConfiguration
        AWSCognitoIdentityUserPool.register(with: serviceConfiguration, userPoolConfiguration: poolConfiguration, forKey: AWSCognitoUserPoolsSignInProviderKey)
    }

    func navigationInit() {
        self.rootNavigationController = UINavigationController()
        let loginViewController = LoginViewController()
        self.rootNavigationController!.pushViewController(loginViewController, animated: false)

        self.window = UIWindow(frame: UIScreen.main.bounds)
        self.window!.rootViewController = rootNavigationController
        self.window!.makeKeyAndVisible()
    }

    //MARK: -
    func applicationWillResignActive(_ application: UIApplication) {
        // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
        // Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
    }

    func applicationDidEnterBackground(_ application: UIApplication) {
        // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
        // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
    }

    func applicationWillEnterForeground(_ application: UIApplication) {
        // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
    }

    func applicationDidBecomeActive(_ application: UIApplication) {
        // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
    }

    func applicationWillTerminate(_ application: UIApplication) {
        // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
        // Saves changes in the application's managed object context before the application terminates.
        self.saveContext()
    }    
}

但是我能够成功使用注册、忘记密码和代码确认。认知配置值也是正确的，因为上述其他操作工作正常。

Answer 1

您是否确认实际上调用了 getDetails 来设置 passwordAuthenticationCompletion 对象？通常要触发身份验证流程开始，您需要执行类似 userPool.currentUser().getSession() 的操作，这将在必要时调用 getDetails 或者如果事件 session 或 refreshToken已经缓存，使用它。