how to create ical calendar from google calendar in ios - iphone

Hi friends,
I am working on calendar app. I want to export my google calendar and export as ics file via coding..
Is any one tried like this, please give some suggestion how can i create ical from google calendar..
I know how to export ical calendar via code..i want export .ical from google calendar ...
please suggest any good tutorial or link for complete this task..
i already looked these links but no one help me..
link 1
link 2

This should be easy using the CalDAV API as ics files is what it uses natively:
https://developers.google.com/google-apps/calendar/caldav/v2/guide

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Original Answer
It's not possible, there is no API for the calendar on the iPhone, sadly. You can build an app that registers for the ical URL scheme, but you still won't be able to save the calendar entries to the calendar backend since there is no API (like e.g. for the AddressBook).
One resolution could be (from iPhone OS 3.0):
estabilish a calendar server (webdav or caldav protocol), create accounts, events...
subscribe your iPhone Calendar to one of the accounts (eg. Settings->Mail, Contacts, Calendars->Add Account…->Other, Add CalDAV Account -> server, account details)
your web based app posts calendar entries into the adequate calendar server account
Alternatively use Google Calendar to post entries from your website, which can be easily synched to iPhone Calendar using CalDAV.
Another usefull link: http://blog.fosketts.net/2009/06/17/subscribe-internet-calendars-iphone-30/
You can create your own ics file and host it on a public url or use free/paid services such https://calex.link or others.