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Page updated Dec 9, 2024

Sign-up

Amplify provides a client library that enables you to interact with backend resources such as Amplify Auth.

The quickest way to get started with Amplify Auth in your frontend application is with the Authenticator component, which provides a customizable UI and complete authentication flows.

To get started, you can use the signUp() API to create a new user in your backend:

func signUp(username: String, password: String, email: String, phonenumber: String) async {
    let userAttributes = [AuthUserAttribute(.email, value: email), AuthUserAttribute(.phoneNumber, value: phonenumber)]
    let options = AuthSignUpRequest.Options(userAttributes: userAttributes)


    do {
        let signUpResult = try await Amplify.Auth.signUp(
            username: username,
            password: password,
            options: options
        )


        if case let .confirmUser(deliveryDetails, _, userId) = signUpResult.nextStep {
            print("Delivery details \(String(describing: deliveryDetails)) for userId: \(String(describing: userId)))")
        } else {
            print("SignUp Complete")
        }
    } catch let error as AuthError {
        print("An error occurred while registering a user \(error)")
    } catch {
        print("Unexpected error: \(error)")
    }
}
func signUp(username: String, password: String, email: String, phonenumber: String) -> AnyCancellable {
    let userAttributes = [
        AuthUserAttribute(.email, value: email),
        AuthUserAttribute(.phoneNumber, value: phonenumber)
    ]
    let options = AuthSignUpRequest.Options(userAttributes: userAttributes)
    Amplify.Publisher.create {
        try await Amplify.Auth.signUp(
            username: username,
            password: password,
            options: options
        )
    }.sink {
        if case let .failure(authError) = $0 {
            print("An error occurred while registering a user \(authError)")
        }
    }
    receiveValue: { signUpResult in
        if case let .confirmUser(deliveryDetails, _, userId) = signUpResult.nextStep {
            print("Delivery details \(String(describing: deliveryDetails)) for userId: \(String(describing: userId)))")
        } else {
            print("SignUp Complete")
        }
    }
    return sink
}

The signUp API response will include a nextStep property, which can be used to determine if further action is required. It may return the following next steps:

Next StepDescription
confirmSignUpThe sign up needs to be confirmed by collecting a code from the user and calling confirmSignUp.
doneThe sign up process has been fully completed.

Confirm sign-up

By default, each user that signs up remains in the unconfirmed status until they verify with a confirmation code that was sent to their email or phone number. The following are the default verification methods used when either phone or email are used as loginWith options.

Login optionUser account verification channel
phonePhone Number
emailEmail
email and phoneEmail

You can confirm the sign-up after receiving a confirmation code from the user:

func confirmSignUp(for username: String, with confirmationCode: String) async {
    do {
        let confirmSignUpResult = try await Amplify.Auth.confirmSignUp(
            for: username,
            confirmationCode: confirmationCode
        )
        print("Confirm sign up result completed: \(confirmSignUpResult.isSignUpComplete)")
    } catch let error as AuthError {
        print("An error occurred while confirming sign up \(error)")
    } catch {
        print("Unexpected error: \(error)")
    }
}
func confirmSignUp(for username: String, with confirmationCode: String) -> AnyCancellable {
    Amplify.Publisher.create {
        try await Amplify.Auth.confirmSignUp(
            for: username,
            confirmationCode: confirmationCode
        )
    }.sink {
        if case let .failure(authError) = $0 {
            print("An error occurred while confirming sign up \(authError)")
        }
    }
    receiveValue: { _ in
        print("Confirm signUp succeeded")
    }
}

Sign up with passwordless methods

Your application's users can also sign up using passwordless methods. To learn more, visit the concepts page for passwordless.

SMS OTP

// Sign up using an phone number
func signUp(username: String, phonenumber: String) async {
    let userAttributes = [
        AuthUserAttribute(.phoneNumber, value: phonenumber)
    ]
    let options = AuthSignUpRequest.Options(userAttributes: userAttributes)
    do {
        let signUpResult = try await Amplify.Auth.signUp(
            username: username,
            options: options
        )
        if case let .confirmUser(deliveryDetails, _, userId) = signUpResult.nextStep {
            print("Delivery details \(String(describing: deliveryDetails)) for userId: \(String(describing: userId)))")
        } else {
            print("SignUp Complete")
        }
    } catch let error as AuthError {
        print("An error occurred while registering a user \(error)")
    } catch {
        print("Unexpected error: \(error)")
    }
}


// Confirm sign up with the OTP received
func confirmSignUp(for username: String, with confirmationCode: String) async {
    do {
        let confirmSignUpResult = try await Amplify.Auth.confirmSignUp(
            for: username,
            confirmationCode: confirmationCode
        )
        print("Confirm sign up result completed: \(confirmSignUpResult.isSignUpComplete)")
    } catch let error as AuthError {
        print("An error occurred while confirming sign up \(error)")
    } catch {
        print("Unexpected error: \(error)")
    }
}
// Sign up using a phone number
func signUp(username: String, phonenumber: String) -> AnyCancellable {
    let userAttributes = [
        AuthUserAttribute(.phoneNumber, value: phonenumber)
    ]
    let options = AuthSignUpRequest.Options(userAttributes: userAttributes)
    let sink = Amplify.Publisher.create {
        try await Amplify.Auth.signUp(
            username: username,
            options: options
        )
    }.sink {
        if case let .failure(authError) = $0 {
            print("An error occurred while registering a user \(authError)")
        }
    }
    receiveValue: { signUpResult in
        if case let .confirmUser(deliveryDetails, _, userId) = signUpResult.nextStep {
            print("Delivery details \(String(describing: deliveryDetails)) for userId: \(String(describing: userId)))")
        } else {
            print("SignUp Complete")
        }
    }
    return sink
}


// Confirm sign up with the OTP received
func confirmSignUp(for username: String, with confirmationCode: String) -> AnyCancellable {
    Amplify.Publisher.create {
        try await Amplify.Auth.confirmSignUp(
            for: username,
            confirmationCode: confirmationCode
        )
    }.sink {
        if case let .failure(authError) = $0 {
            print("An error occurred while confirming sign up \(authError)")
        }
    }
    receiveValue: { _ in
        print("Confirm signUp succeeded")
    }
}

Email OTP

// Sign up using an email
func signUp(username: String, email: String) async {
    let userAttributes = [
        AuthUserAttribute(.email, value: email)
    ]
    let options = AuthSignUpRequest.Options(userAttributes: userAttributes)
    do {
        let signUpResult = try await Amplify.Auth.signUp(
            username: username,
            options: options
        )
        if case let .confirmUser(deliveryDetails, _, userId) = signUpResult.nextStep {
            print("Delivery details \(String(describing: deliveryDetails)) for userId: \(String(describing: userId)))")
        } else {
            print("SignUp Complete")
        }
    } catch let error as AuthError {
        print("An error occurred while registering a user \(error)")
    } catch {
        print("Unexpected error: \(error)")
    }
}


// Confirm sign up with the OTP received
func confirmSignUp(for username: String, with confirmationCode: String) async {
    do {
        let confirmSignUpResult = try await Amplify.Auth.confirmSignUp(
            for: username,
            confirmationCode: confirmationCode
        )
        print("Confirm sign up result completed: \(confirmSignUpResult.isSignUpComplete)")
    } catch let error as AuthError {
        print("An error occurred while confirming sign up \(error)")
    } catch {
        print("Unexpected error: \(error)")
    }
}
// Sign up using an email
func signUp(username: String, email: String) -> AnyCancellable {
    let userAttributes = [
        AuthUserAttribute(.email, value: email)
    ]
    let options = AuthSignUpRequest.Options(userAttributes: userAttributes)
    let sink = Amplify.Publisher.create {
        try await Amplify.Auth.signUp(
            username: username,
            options: options
        )
    }.sink {
        if case let .failure(authError) = $0 {
            print("An error occurred while registering a user \(authError)")
        }
    }
    receiveValue: { signUpResult in
        if case let .confirmUser(deliveryDetails, _, userId) = signUpResult.nextStep {
            print("Delivery details \(String(describing: deliveryDetails)) for userId: \(String(describing: userId)))")
        } else {
            print("SignUp Complete")
        }
    }
    return sink
}


// Confirm sign up with the OTP received
func confirmSignUp(for username: String, with confirmationCode: String) -> AnyCancellable {
    Amplify.Publisher.create {
        try await Amplify.Auth.confirmSignUp(
            for: username,
            confirmationCode: confirmationCode
        )
    }.sink {
        if case let .failure(authError) = $0 {
            print("An error occurred while confirming sign up \(authError)")
        }
    }
    receiveValue: { _ in
        print("Confirm signUp succeeded")
    }
}

Auto Sign In

// Confirm sign up with the OTP received and auto sign in
func confirmSignUp(for username: String, with confirmationCode: String) async {
    do {
        let confirmSignUpResult = try await Amplify.Auth.confirmSignUp(
            for: username,
            confirmationCode: confirmationCode
        )
        if case .completeAutoSignIn(let session) = confirmSignUpResult.nextStep {
            let autoSignInResult = try await Amplify.Auth.autoSignIn()
            print("Auto sign in result: \(autoSignInResult.isSignedIn)")
        } else {
            print("Confirm sign up result completed: \(confirmSignUpResult.isSignUpComplete)")
        }
    } catch let error as AuthError {
        print("An error occurred while confirming sign up \(error)")
    } catch {
        print("Unexpected error: \(error)")
    }
}
// Confirm sign up with the OTP received and auto sign in
func confirmSignUp(for username: String, with confirmationCode: String) -> AnyCancellable {
    Amplify.Publisher.create {
        try await Amplify.Auth.confirmSignUp(
            for: username,
            confirmationCode: confirmationCode
        )
    }.sink {
        if case let .failure(authError) = $0 {
            print("An error occurred while confirming sign up \(authError)")
        }
    }
    receiveValue: { confirmSignUpResult in
        if case let .completeAutoSignIn(session) = confirmSignUpResult.nextStep {
            print("Confirm Sign Up succeeded. Next step is auto sign in")
            // call `autoSignIn()` API to complete sign in
        } else {
            print("Confirm sign up result completed: \(confirmSignUpResult.isSignUpComplete)")
        }
    }
}


func autoSignIn() -> AnyCancellable {
    Amplify.Publisher.create {
        try await Amplify.Auth.autoSignIn()
    }.sink {
        if case let .failure(authError) = $0 {
            print("Auto Sign in failed \(authError)")
        }
    }
    receiveValue: { autoSignInResult in
        if autoSignInResult.isSignedIn {
            print("Auto Sign in succeeded")
        }
    }
}
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