Integrate Google Sign-In with Firebase Authentication

A step-by-step guide with sample code.

This article is originally published at https://swiftsenpai.com on June 15, 2020.

When it comes to third party backend authentication services for iOS apps, the first that comes to mind for sure is Firebase Authentication. By using Firebase Authentication, iOS developers can skip the hassle of setting up a secure backend server and only focus on the mobile side implementation.

Even though Firebase Authentication and Google Sign-in for iOS are both products of Google, they do not automatically integrate with each other.

In this article, I will show you, step-by-step on how to set up Firebase for your iOS project and integrate it with Firebase Authentication.

Prerequisite

This article is the continuation of my previous article Google Sign-In Integration in iOS. If you do not have an iOS app that is already integrated with Google Sign-in, I highly recommend you to go through the previous article before proceeding with this one.

As a quick recap, here’s where we left off: