Exception when sorting NSMutableArray which contains all NSDate objects.

Question

//list has type of NSMutableArray

NSSortDescriptor *sortDescriptor = [[[NSSortDescriptor alloc] initWithKey:@"date" ascending:YES] autorelease];
[list sortUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];

I got this exception: Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<__NSDate 0x5d57980> valueForUndefinedKey:]: this class is not key value coding-compliant for the key date.'

Any idea? How to fix it?

Answer 1

An NSDate does not have the -date method, so your NSSortDescriptor won't work.

Why not just use

[list sortUsingSelector:@selector(compare:)];

?