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问题:
  I have two apps one is free and another is paid version. I have implemented google+ share on paid and its working fine. But when I copied code to my free version it doesn't work. I have one Google apis project and added two clients for both iOS apps.
  I get "Safari cannot open page because address in invalid" erro after sharing or cancel and it does not open my app.
  Please help 
  I followed all steps defined at https://developers.google.com/+/mobile/ios/share#detecting_if_a_post_was_successfully_shared 
      回答1:
 Add this method into your appdelgate
    - (BOOL)application:(UIApplication *)application         openURL:(NSURL *)url  sourceApplication:(NSString *)sourceApplication      annotation:(id)annotation { NSLog(@"%@",sourceApplication);   // Handle Google+ sign-in button URL. if ([signInButton_ handleURL:url            sourceApplication:sourceApplication                   annotation:annotation]) {     return YES; }     return NO; } 
      回答2:
 Make sure that you add a URL Type for your app and that it matches the bundle ID of your app. I made a typo in specifying the URL and it took me a while to figure out why it wasn't working. https://developers.google.com/+/mobile/ios/getting-started#step_3_add_a_url_type
      回答3:
 For this we have to add URL schemes and identifier value in ProjectName - settings tab - info tab - URL Types tab.
  Like in the below screenshot
  