Listen to auth events

Amplify Auth emits events during authentication flows, which enables you to react to user flows in real time and trigger custom business logic. For example, you may want to capture data, synchronize your app's state, and personalize the user's experience. You can listen to and respond to events across the Auth lifecycle such as sign-in and sign-out.

AWS Cognito Auth Plugin sends important events through Amplify Hub. You can listen to these events like the following:

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.
    // Assumes `unsubscribeToken` is declared as an instance variable in your view
    unsubscribeToken = Amplify.Hub.listen(to: .auth) { payload in
        switch payload.eventName {
        case HubPayload.EventName.Auth.signedIn:
            print("User signed in")
            // Update UI
        case HubPayload.EventName.Auth.sessionExpired:
            print("Session expired")
            // Re-authenticate the user
        case HubPayload.EventName.Auth.signedOut:
            print("User signed out")
            // Update UI
        case HubPayload.EventName.Auth.userDeleted:
            print("User deleted")
            // Update UI
        default:
            break

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.
    // Assumes `sink` is declared as an instance variable in your view controller
    sink = Amplify.Hub
        .publisher(for: .auth)
        .sink { payload in
            switch payload.eventName {
            case HubPayload.EventName.Auth.signedIn:
                print("User signed in")
                // Update UI
            case HubPayload.EventName.Auth.sessionExpired:
                print("Session expired")
                // Re-authenticate the user
            case HubPayload.EventName.Auth.signedOut:
                print("User signed out")
                // Update UI
            case HubPayload.EventName.Auth.userDeleted:
                print("User deleted")
                // Update UI
            default:
                break

Manage user attributes

Delete user account