Subject: sort array of dictionaries by multiple critera


I have an array of dictionaries.

One dictionary-entry looks like this:

ID = 34;
counter = 2;
date = "2011-04-19 15:43:52 +0200";
title = "test.pdf";
type = file;

Now I would like to sort my array of dictionaries first by type and then
(within the type-dictionaries) by date.

I can sort my array by one critierion with a NSSortDescriptor:

NSSortDescriptor *descriptor;
descriptor = [[NSSortDescriptor alloc] initWithKey:@"date" ascending:NO];
[bookmarks sortUsingDescriptors:[NSArray arrayWithObjects:descriptor, nil]];

but how can I first "group" the dictionaries by type and then within the types
sort them by date?
(so use two sorting-criteria with a different priority)

thanks for any suggestions!_______________________________________________

Cocoa-dev mailing list (Cocoa-dev@xxxxxxxxxxxxxxx)

Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)

Help/Unsubscribe/Update your Subscription:

This email sent to maillists@xxxxxxxxx