Calendar Custom Event Creation in iOS SDK

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

EKEvent *event = [EKEvent eventWithEventStore:eventStore];

event.title = @"EVENT TITLE";

event.startDate = [[NSDate alloc] init];

event.endDate = [[NSDate alloc] initWithTimeInterval:600 sinceDate:event.startDate];

[event setCalendar:[eventStore defaultCalendarForNewEvents]];

NSError *err;

[eventStore saveEvent:event span:EKSpanThisEvent error:&err];

Note: Please include Eventkit framework and include

#import EventKit/EventKit.h