tutorial-native-authentication-ios-macos-sign-in-user-after-sign-up.md

title	Sign in user automatically after sign-up in iOS/macOS app
description	Learn how to automatically sign-in a user after sign-up in an iOS/macOS app by using native authentication.
author	henrymbuguakiarie
manager	pmwongera
ms.author	henrymbugua
ms.service	identity-platform
ms.subservice	external
ms.topic	tutorial
ms.date	09/02/2024
ms.custom

Tutorial: Sign in user automatically after sign-up in an iOS/macOS app

[!INCLUDE applies-to-external-only]

This tutorial demonstrates how to sign in user automatically after sign-up in an iOS/macOS app by using native authentication.

In this tutorial, you:

[!div class="checklist"]

• Sign in after sign-up.
• Handle errors.

Prerequisites

• If you’re on iOS, follow the steps in Sign in users in sample iOS (Swift) mobile app by using native authentication. If you’re using macOS, follow the steps in Sign in users in sample macOS (Swift) app by using native authentication. These articles show you how to run sample apps that you configure using your tenant settings.
• Tutorial: Add sign-up in an iOS/macOS app using native authentication. The steps in this tutorial should work whether you sign up with email and password or email one-time passcode.

Sign in after sign-up

The Sign in after sign up is an enhancement functionality of the sign in user flows, which has the effect of automatically signing in after successfully signing up. The SDK provides developers the ability to sign in a user after signing up, without having to supply the username, or to verify the email address through a one-time passcode.

To sign in a user after successful sign-up use the signIn(delegate) method from the new state SignInAfterSignUpState returned in the onSignUpCompleted(newState):

extension ViewController: SignUpVerifyCodeDelegate {
    func onSignUpVerifyCodeError(error: MSAL.VerifyCodeError, newState: MSAL.SignUpCodeRequiredState?) {
        resultTextView.text = "Error verifying code: \(error.errorDescription ?? "no description")"
    }

    func onSignUpCompleted(newState: SignInAfterSignUpState) {
        resultTextView.text = "Signed up successfully!"
        let parameters = MSALNativeAuthSignInAfterSignUpParameters()
        newState.signIn(parameters: parameters, delegate: self)
    }
}

The signIn(parameters:delegate) accepts a MSALNativeAuthSignInAfterSignUpParameters instance and a delegate parameter and we must implement the required methods in the SignInAfterSignUpDelegate protocol.

In the most common scenario, we receive a call to onSignInCompleted(result) indicating that the user has signed in. The result can be used to retrieve the access token.

extension ViewController: SignInAfterSignUpDelegate {
    func onSignInAfterSignUpError(error: SignInAfterSignUpError) {
        resultTextView.text = "Error signing in after sign up"
    }

    func onSignInCompleted(result: MSAL.MSALNativeAuthUserAccountResult) {
        // User successfully signed in
        let parameters = MSALNativeAuthGetAccessTokenParameters()
        result.getAccessToken(parameters: parameters, delegate: self)
    }
}

The getAccessToken(parameters:delegate) accepts a MSALNativeAuthGetAccessTokenParameters instance and a delegate parameter and we must implement the required methods in the CredentialsDelegate protocol.

In the most common scenario, we receive a call to onAccessTokenRetrieveCompleted(result) indicating that the user obtained an access token.

extension ViewController: CredentialsDelegate {
    func onAccessTokenRetrieveError(error: MSAL.RetrieveAccessTokenError) {
        resultTextView.text = "Error retrieving access token"
    }

    func onAccessTokenRetrieveCompleted(result: MSALNativeAuthTokenResult) {
        resultTextView.text = "Signed in. Access Token: \(result.accessToken)"
    }
}

[!INCLUDE Custom claims provider]

Next step

[!div class="nextstepaction"] Tutorial: Self-service password reset