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NSSortDescriptor not working with array of custom classes

Subject: NSSortDescriptor not working with array of custom classes
From: Ken Tozier <email@hidden>
Date: Fri, 19 Oct 2007 12:33:33 -0400
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Hi

I have an NSMutableArray containing instances of a custom "Page" class and can't get NSSortDescriptor to do anything. The page class has an accessor method for the property I want to sort.

- (id) pageNumber
{
	return [pageRecord objectForKey: @"page_number"];
}

In the object that contains the page array, the sort descriptor array is initialized like this

NSArray *sortDescriptors = [NSArray arrayWithObject: [[NSSortDescriptor alloc] initWithKey: @"pageNumber" ascending: YES]];

And I try to use it like this

NSLog(@"before sorting: %@", selectedPages);

[selectedPages sortUsingDescriptors: sortDescriptors];

NSLog(@"after sorting: %@", selectedPages);

Regardless of the order in which I select pages, the before and after arrays are identical. Anyone see where I'm messing up?

Thanks for any help

Ken
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