how to sort NSMutableArray

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How to sort an NSMutableArray with custom objects in it?

Having trouble with something basic (I think).

I have an NSMutable array that I populate with "workout" objects. The "startDate" method returns an NSDate - and I'd like to sort the array off this.

The NSSortDescriptor *sortByDate line terminates due to an uncaught exception. What's wrong here?

NSMutableArray *workouts;
workouts = [[[Workout findByCriteria:@"where state = %@ order by pk desc", 
  [NSNumber numberWithInt:WorkoutStateComplete]] mutableCopy] autorelease];
NSSortDescriptor *sortByDate = [NSSortDescriptor 
  sortDescriptorWithKey:@"startDate" ascending:NO];
[workouts sortUsingDescriptors:[NSArray arrayWithObject:sortByDate]];

Kenny - I looked at many links, but didn't see this one. Close enough to set me straight. Thank you. — BankStrong, Jun 04 '10 at 20:24
have a look at this http://stackoverflow.com/questions/1844031/how-to-sort-nsmutablearray-using-sortedarrayusingdescriptors/1845165#1845165 — stefanB, Jun 04 '10 at 23:54

score 0 · Answer 1 · answered Jun 05 '10 at 05:16

0

Make sure none of the objects in the workouts array have startDate set to nil or return nil. Also make sure that all objects in the array respond to the startDate selector.

answered Jun 05 '10 at 05:16

lucius

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how to sort NSMutableArray

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