如何通过编程方式在iphone中编辑日历

Question

我正在开发一个应用程序，因为我已经收集了来自webService的数据，现在我想将该特定信息存储到日历中，以便我遵守以下代码编写的日期

self.eventStore = [[EKEventStore alloc ] init ];

event  = [EKEvent eventWithEventStore:eventStore];

Detail *detail1=[DetailArray objectAtIndex:indexPath.row];

//-------------------------------------------------------   


// Get an array of all the calendars.
calendars = eventStore.calendars;

// Get the default calendar, set by the user in preferences.
EKCalendar *defaultCal = eventStore.defaultCalendarForNewEvents;

// Find out if this calendar is modifiable.
 isDefaultCalModifiable = defaultCal.allowsContentModifications ;


self.event = [ EKEvent eventWithEventStore:eventStore ];

self.event.title = detail1.companyname; 
//self.event.location = @"Pune" ;

//NSDate *today = [NSDate date];

//date=[[NSDate alloc] init];

NSDateFormatter* formatter = [[[NSDateFormatter alloc] init] autorelease];
[formatter setDateFormat:@"dd/MM/yyyy"];
NSString *dateStart1 = detail1.filedate;//[formatter stringFromDate:date];





NSDate *dateStart =[formatter dateFromString:dateStart1] ;

NSDate *dateEnd = [formatter dateFromString:dateStart1];

self.event.startDate = dateStart;
self.event.endDate   = dateEnd; 

self.event.calendar = defaultCal ;  


NSError *error;
saved = [self.eventStore saveEvent:self.event span:EKSpanThisEvent error:&error];
//-------------------------------------------------------   

但在完成此代码后，应用终止或提供EXC-BAD ..

所以任何人都可以为我提供解决方案，或者为我提供示例代码的解决方案。

感谢。 普里....