Add calendar options

gistfile1.m

//add calendar option
- (void)_addToCalendar{
    NSString *meetingTitle=  [NSString stringWithFormat:@"Meeting with %@", self.meeting.participant.name.capitalizedString];
    EKEventStore *store = [[EKEventStore alloc] init];
    [store requestAccessToEntityType:EKEntityTypeEvent completion:^(BOOL granted, NSError *error) {
        if (!granted) {return;}
        BOOL matched = [self _checkForExistedCalendarInStore:store];
        dispatch_async(dispatch_get_main_queue(), ^{
        if (matched){
                [[[UIAlertView alloc] initWithTitle:@"Warning" message:@"This meeting has already been added to your calendar." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil] show];
        } else {
            EKEvent *event = [EKEvent eventWithEventStore:store];
            event.title = meetingTitle;
            event.startDate = self.meeting.meetingDate;
            event.endDate = [self.meeting.meetingDate dateByAddingTimeInterval:1*60*60];
            event.endDate = self.meeting.meetingDate;
            event.notes = self.meeting.notes;
            [event setCalendar:[store defaultCalendarForNewEvents]];
            NSError *err = nil;
            [store saveEvent:event span:EKSpanThisEvent commit:YES error:&err];
            [[[UIAlertView alloc]initWithTitle:@"Done" message:@"You have successfully added the meeting to your calendar." delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil] show];
            }
        });
    }];
}

//private
- (BOOL)_checkForExistedCalendarInStore:(EKEventStore *)store{
    NSString *meetingTitle=  [NSString stringWithFormat:@"Meeting with %@", self.meeting.participant.name.capitalizedString];
    NSPredicate *predicate = [store predicateForEventsWithStartDate:self.meeting.meetingDate endDate:[self.meeting.meetingDate dateByAddingTimeInterval:1*60*60] calendars:nil];
    NSArray *matchedEvent = [store eventsMatchingPredicate:predicate];
    for (EKEvent *event in matchedEvent) {
        if([event.title isEqualToString:meetingTitle]){
            return YES;
        }
    }
    return NO;
}