How to Integrate Google Sign In with Firebase

2. Enable Google sign-in in your Firebase console:

a. Open your GoogleService-Info.plist inside Xcode:

2. Configure the FirebaseApp object inside your project’s App Delegate:

a. First import Firebase and GoogleSignIn in your project

b. In your app delegate’s application:didFinishLaunchingWithOptions: method, configure the FirebaseApp object.

c. Implement the application:openURL:options: method of your app delegate.

3. Create Google Sign In button in your view controller:

a. Create a button with the GIDSignInButton type

b. Add the created button as an subview in your viewDidLoad().

c. Give your button a width and height in your controllers viewDidLayoutSubviews()

d. Give your button a target to start executing the Sign In process in viewDidLoad()

4. Implement Sign In on button tap:

a. Import FirebaseAuth and GoogleSignIn inside your controller

b. Create the didTapGID function to handle our Sign In. Create clientID from your Firebase App and create a config object with type GIDConfiguration and pass in the clientID.

c. Start the Sign In process with the Configuration object create in the previous step. Get the accessToken and idToken and create an credential object that will be used to Sign In to Firebase.

d. Now Sign In to Firebase using Firebase Auth and the credential object that we created in the previous step.

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