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

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

In this tutorial, you learn how to:

Prerequisites

• Sign in users in a sample native iOS mobile application
• Tutorial: Add built-in attributes to sign up with 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!"
        newState.signIn(delegate: self)
    }
}

The signIn(delegate) accepts 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
        result.getAccessToken(delegate: self)
    }
}

The getAccessToken(delegate) accepts 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)"
    }
}

Next step