How can I programmatically create an iCal event in the default calendar?

Question

How can I use Objective-C to programmatically create an iCal event in the default calendar? I want to check whether the event already exists and set the button state accordi

Answer 1

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

 EKEvent *event = [EKEvent eventWithEventStore:eventStore];
 NSDate *date = [[NSDate alloc ]init];//today,s date
 event.title = @"remainder";//title for your remainder

 event.startDate=date;//start time of your remainder
 event.endDate = [[NSDate alloc] initWithTimeInterval:1800 sinceDate:event.startDate];//end time of your remainder

 NSTimeInterval interval = (60 *60)* -3 ;
 EKAlarm *alarm = [EKAlarm alarmWithRelativeOffset:interval]; //Create object of alarm

 [event addAlarm:alarm]; //Add alarm to your event

 [event setCalendar:[eventStore defaultCalendarForNewEvents]];
  NSError *err;
  NSString *ical_event_id;
  //save your event
 if([eventStore saveEvent:event span:EKSpanThisEvent error:&err]){
        ical_event_id = event.eventIdentifier;
        NSLog(@"%@",ical_event_id);
 }

 for more info check this link

sample for EKEvent