How to update and remove calendar event? - iphone

Question

I am doing a sample application using iPhone calendar events. I am able to save the calendar event from my application to iPhone native calendar. While saving I am saving the saved event identifier in to my application database. Now I need to update the same event or remove the event. How can I do using the event Identifier which is saved in my database. Here is the piece of code for saving the event and saving the event identifier into database.
ENTITYCMAPPIPHONE *appointmentCM;
NSError *error;
NSFetchRequest *fetchRequest =
[managedObjectModel fetchRequestFromTemplateWithName:#"FetchForIphoneAppointment" substitutionVariables:nil];
NSArray *fetchedObjects= [context executeFetchRequest:fetchRequest error:nil];
int fetchCount = [fetchedObjects count];
if ([fetchedObjects count]>0) {
for (appointmentCM in fetchedObjects) {
NSLog(#"Appoint subject %#", appointmentCM.subject);
NSLog(#"APP notes %#", appointmentCM.notes);
appoint_ID = [appointmentCM.mobAppID intValue];
NSDateFormatter *f = [[NSDateFormatter alloc] init];
[f setDateFormat:#"yyyy-MM-dd HH:mm:ss"];
NSDate *date = [f dateFromString:#"2012-09-10 13:55:15"];
NSCalendar *calendar = [NSCalendar currentCalendar];
NSInteger units = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSWeekdayCalendarUnit;
NSDateComponents *components = [calendar components:units fromDate:date];
NSInteger year = [components year];
NSInteger day = [components day];
NSDateFormatter *weekDay = [[[NSDateFormatter alloc] init] autorelease];
[weekDay setDateFormat:#"EEE"];
NSDateFormatter *calMonth = [[[NSDateFormatter alloc] init] autorelease];
[calMonth setDateFormat:#"MMMM"];
EKEventStore *eventStore1 = [[EKEventStore alloc] init];
EKEvent *event = [EKEvent eventWithEventStore:eventStore1];
event.title = appointmentCM.subject;
event.notes = appointmentCM.notes;
event.startDate = date;
event.endDate = [[NSDate alloc] initWithTimeInterval:600 sinceDate:event.startDate];
[event setCalendar:[eventStore1 defaultCalendarForNewEvents]];
NSError *err;
[eventStore1 saveEvent:event span:EKSpanThisEvent error:&err];
eventID = [[NSString alloc] initWithFormat:#"%#", event.eventIdentifier];
[self updateIphoneCalendarEventID];
}
if (![context save:&error]) {
NSLog(#"Whoops, couldn't save: %#", [error localizedDescription]);
}
}
}
-(void)updateIphoneCalendarEventID{
NSError *error;
NSDictionary *subs;
subs = [NSDictionary
dictionaryWithObjectsAndKeys:[NSNumber numberWithInt:appoint_ID], #"search_appID", nil];
NSFetchRequest *fetchRequestCheckNil =
[managedObjectModel fetchRequestFromTemplateWithName:
#"FetchEditIphoneCalendar" substitutionVariables:subs];
NSArray *fetchedObjects=[context executeFetchRequest:fetchRequestCheckNil error:nil];
if ([fetchedObjects count]>0) {
for (ENTITYAPPOINTMENTS *appDetails
in fetchedObjects) {
[self updateDBModelForAppointments:appDetails];
}
}
if (![context save:&error]) {
NSLog(#"Whoops, couldn't save: %#", [error localizedDescription]);
}
}
-(void)updateDBModelForAppointments:(ENTITYAPPOINTMENTS *)contactDetails{
contactDetails.iphoneAppID = eventID;
}

Answer 1

EKEventStore *eventStore = [[[EKEventStore alloc] init] autorelease];
NSString *idenfier = nil;//.....;// Get identifier stored in your application database
NSError *err = nil;
EKEvent *ev = [eventStore eventWithIdentifier:idenfier];
if(err){
NSLog(#"Error: %#",[err localizedDescription]);
}
else
{
// manipulate event...
ev.title = #"new title";
ev.location = #"new location";
// or remove:
[eventStore removeEvent:ev span:EKSpanFutureEvents commit:NO error:&err];
}