iOS: GooglePlus: Could not detect event on closing the safari page

I am developing an iOS app, I have successfully integrated Google Plus API, for iPhone in my App. And everything is working very fine.

My problem is,

1. I have clicked the Sign In button, and Google Plus has opened its page Safari.

2. Now, If I close the safari page manually , without sign in.

3. Whenever I open my page. How to detect this event,

As I have to stop the Activity Indicator, and Enable User Interaction on failing to login kind of event.

One of the solution is there I should check some of the property y to check in

- (void)applicationDidBecomeActive:(UIApplication *)application {

Which property to set of

[GPPSignIn sharedInstance]

If anybuddy has handled this situation.

via Chebli Mohamed