SignIn with GooglePlus in iOS App without flipping between Safari

If your app has been using Google+ login for years, and suddenly the recent update got rejected with message like this:

Specifically, the app opens a web page in mobile Safari for Google+ authentication, then returns the user to the app. The user should be able to sign in to Google+ without opening Safari.

It’s time to upgrade google sign-in SDK, here is the online guide: https://developers.google.com/identity/sign-in/ios/start

Unfortunately, there are some confusion in that guide, hope the following tips can help you:

Steps

1. Download Google Sign-in SDK (2.2.0 as is now), add GoogleSignIn.bundle and GoogleSignIn.framework  to project. I am using manually instead of coacapods. (Recently pod caused enough problems to my other projects.)
2. Get a Google Sign-In configuration file, from which you will find client-id, revised client-id which are needed later. This file itself is not in use.
3. Add 2 more entry to project target info.plist file, I left facebook setup here so we can compare

   <key>CFBundleURLTypes</key>
   <array>
   <dict>
   <key>CFBundleTypeRole</key>
   <string>Editor</string>
   <key>CFBundleURLSchemes</key>
   <array>
   <string>fb425980604155625</string>
   </array>
   </dict>
   <dict>
   <key>CFBundleTypeRole</key>
   <string>Editor</string>
   <key>CFBundleURLName</key>
   <string>com.foodplannerapp</string>
   <key>CFBundleURLSchemes</key>
   <array>
   <string>com.foodplannerapp</string>
   </array>
   </dict>
   <dict>
   <key>CFBundleTypeRole</key>
   <string>Editor</string>
   <key>CFBundleURLSchemes</key>
   <array>
   <string>com.googleusercontent.apps.1070812041215-ap9sle5s7qnaqgeov8emb2r28simo39c</string>
   </array>
   </dict>
   <dict>
   <key>CFBundleTypeRole</key>
   <string>Editor</string>
   <key>CFBundleURLSchemes</key>
   <array>
   <string>com.foodplannerapp</string>
   </array>
   </dict>
   </array>
   
   

4. Code implementation, following online guide: https://developers.google.com/identity/sign-in/ios/sign-in
   Note: You might encounter 2 difficulties here:

   a) Can’t add GIDSignInButton,
   Workaround: create your own IBAction method:

   - (IBAction)signInWithGooglePlus:(id)sender
   {
   [[GIDSignIn sharedInstance] signIn];
   }
   

   b) Runtime Error:

   When |allowsSignInWithWebView| is enabled, uiDelegate must either be a |UIViewController| or implement the |signIn:presentViewController:| and |signIn:dismissViewController:| methods from |GIDSignInUIDelegate|

   Solution: assign uiDelegate.

   [GIDSignIn sharedInstance].clientID = kClientID;
   [GIDSignIn sharedInstance].delegate = self;
   [GIDSignIn sharedInstance].uiDelegate = self;
   //the following line is optional, default value is YES anyway
   [GIDSignIn sharedInstance].allowsSignInWithWebView = YES; 
   

Observation: application:openURL: method is not called, as described as step 3 in doc: https://developers.google.com/identity/sign-in/ios/sign-in
The main purpose of using new SDK is to remove flipping between Safari, but if you do what to use flipping Safari to login google+, set allowsSignInWithWebView to NO, wala! you are back to old times, and get ready to see your app being rejected by Apple.

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