NSKeyedUnarchiver unarchiveObjectWithData conversion issue

Question

I am using the following code to convert NSArray EKEvent to NSData and the converted NSData is unarchiveObjectWithData to NSArray. While converting, the object is changed and it holds the null value.

Why does it show NULL. (Refer to the output). Anyone know the solution let me know. Thanks in Advance.

The code I written,

NSArray *events = [[self.eventStore eventsMatchingPredicate:predicate]retain];

NSData *arrayData = [NSKeyedArchiver archivedDataWithRootObject:events];

NSArray *array = [NSKeyedUnarchiver unarchiveObjectWithData:arrayData];

The Output is

events : ( "EKEvent <0x4ad840> {EKEvent <0x4ad840> {title = Checking with Calendar; calendar = EKCalendar <0x4bf2f0> {title = Calendar; type = Local; account = (null); allowsModify = YES; color = 0.443137 0.101961 0.462745 1.000000}; alarms = (\n \"EKAlarm <0x4be630> {triggerInterval = -300.000000}\"\n); URL = (null); lastModified = 2012-05-14 12:15:32 +0000}; location = (null); startDate = 2012-05-11 01:30:00 +0000; endDate = 2012-05-19 17:30:00 +0000; allDay = 0; floating = 0; recurrence = (null); attendees = (null)}" )

Array : ( "EKEvent <0x4c1e60> {EKEvent <0x4c1e60> {title = (null); calendar = (null); alarms = (null); URL = (null); lastModified = (null)}; location = (null); startDate = (null); endDate = (null); allDay = 0; floating = 1; recurrence = (null); attendees = (null)}" )

Answer 1

While NSArray confirms to the NSCoding protocol, EKEvent does not. It's a bit surprising that you don't get an exception running the code, the class must confirm to NSCoding for archiving to work.

Answer 2

Finally Solved by creating custom EKEvent class and getting every value like title, startdate, enddate to NSCoding. Then it works fine.