Put it all together - Login with single platform auth - (Unreal Engine module)

Last updated on March 24, 2025

Connect the UI to let player log in with single platform auth​

In this tutorial, you will learn how to connect the SinglePlatformAuthWidget_Starter class with the AuthEssentialsSubsystem_Starter subsystem to handle the single platform auth login process.

  1. Open the SinglePlatformAuthWidget_Starter C++ class and ensure that your class has the following highlighted code in the NativeOnActivated() function.

    void USinglePlatformAuthWidget_Starter::NativeOnActivated()
    {
    // ...
        if (ShouldAutoLogin())
        {
            OnLoginWithSinglePlatformAuthButtonClicked();
            return;
        }

        const FString LoginButtonText = TEXT_LOGIN_WITH.ToString().Replace(TEXT("%PLATFORM%"), *GetDefaultNativePlatform());
        Btn_LoginWithSinglePlatformAuth->SetButtonText(FText::FromString(LoginButtonText));
        Btn_LoginWithSinglePlatformAuth->OnClicked().AddUObject(this, &ThisClass::OnLoginWithSinglePlatformAuthButtonClicked);
        LoginWidget->SetButtonLoginVisibility(ShouldDisplayDeviceIdLogin() ? ESlateVisibility::Visible : ESlateVisibility::Collapsed);
    }

  2. In the same class, add the following highlighted code to the OnLoginWithSinglePlatformAuthButtonClicked() function.

    void USinglePlatformAuthWidget_Starter::OnLoginWithSinglePlatformAuthButtonClicked()
    {
        // Set the login widget to logging in state and bind the retry login delegate.
        LoginWidget->SetLoginState(ELoginState::LoggingIn);
        LoginWidget->OnRetryLoginDelegate.AddUObject(this, &ThisClass::OnLoginWithSinglePlatformAuthButtonClicked);

        // Login with single platform auth is considered as login with default native platform.
        // Thus, it doesn't need username, token, nor the login method.
        AuthSubsystem->SetAuthCredentials(EAccelByteLoginType::None, TEXT(""), TEXT(""));
        AuthSubsystem->Login(GetOwningPlayer(), FAuthOnLoginCompleteDelegate::CreateUObject(LoginWidget, &std::remove_pointer_t<decltype(LoginWidget)>::OnLoginComplete));
    }

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