YMCalendarActivity
YMCalendarActivity is a custom UIActivity that adds event to the calendar with EKEventEditViewController.

Requirements
iOS 6+ for UIActivity support.
Installation
Add EventKit.framework and EventKitUI.framework to your project.
Then add YMCalendarActivity.h, YMCalendarActivity.m, YMCalendarActivityEvent.h and YMCalendarActivityEvent.m to your project.
Usage
See demo project.
License
The MIT License. See LICENSE.
