JEON - James Eunson Online Services

This was a little hard to track down, so I though I’d include the code to achieve this here.

Firstly, add the EventKit and EventKitUI frameworks to your project. Then these imports in your file of choice:

#import <EventKit/EventKit.h>
#import <EventKitUI/EventKitUI.h>

Next is the actual event creation code itself. I put this in a method invoked by target action from a UIBarButtonItem.

EKEventStore *eventStore = [[EKEventStore alloc] init];


// Initialise your event - perhaps from a pre-existing data structure
EKEvent *calendarEvent  = [EKEvent eventWithEventStore:eventStore];
calendarEvent.title     = @"Your event title";
    
calendarEvent.startDate = [NSDate date]; // Your starting date here
calendarEvent.endDate = [NSDate dateWithTimeIntervalSinceNow:600]; // Your end date here
calendarEvent.notes = @"Details about your event here";
calendarEvent.location = @"Location of your event here";
    
[calendarEvent setCalendar:[eventStore defaultCalendarForNewEvents]];
// Initialise the event editing controller. There is also an event viewing controller that you can initialise, however
// this gives the user the opportunity to check the details of the event before agreeing to it

EKEventEditViewController *eventEditController = [[EKEventEditViewController alloc] init];
eventEditController.event = calendarEvent;
eventEditController.editViewDelegate = self;
eventEditController.eventStore = eventStore;


// Present the editing controller modally    
[self presentModalViewController:eventEditController animated:YES];
    
[eventEditController release];
[eventStore release];

To complete the process you also need to implement the EKEventEditViewDelegate in the object calling the event editing controller. The only @required delegate method to implement is:

- (void)eventEditViewController:(EKEventEditViewController *)controller didCompleteWithAction:(EKEventEditViewAction)action

The most basic implementation of this that functions is:

- (void)eventEditViewController:(EKEventEditViewController *)controller didCompleteWithAction:(EKEventEditViewAction)action {
    [self dismissModalViewControllerAnimated:YES];
}

Apple has a decent guide on this in the official documentation, although you could be forgiven for not finding it: http://developer.apple.com/library/ios/#documentation/DataManagement/Conceptual/EventKitProgGuide/Introduction/Introduction.html