iOS sync calendar with google calendar at local app - ios

I'm writing an app to sync with the built-in calendar.app using event kit. The built-in calendar.app will sync with Google Calendar when opening. However, my app will not sync with Google Calendar when opening.
Is there any method to sync with Google Calendar through the built-in calendar.app in code (open my app, and it will sync with Google Calendar without any setting)?

In iOS5 EKEventStore have refreshSourcesIfNecessary method.

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Synchronize Google Calendar?

Im having a calendar inside my app and it is possible to synchronize that calendar with the apple calendar app on iOS (it then automatically synchronizes with icloud if enabled).
Now I want the same for the google calendar app on iOS but all I could find for now is the google calendar web API. The problem: you need to be online for that but my App should have a full offline support. So I thought maybe it would be possible to access the iOS google calendar app installed on the device to add / remove / modify events.
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