iPhone - NSDictionary sorting based on values [duplicate]

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Possible Duplicate:

NSDictionary keys sorted by value numerically?

I'm maintaining the scores of my game in a dictionary. Key will be the name of the user and value will be the score. When displaying the scores in table view, I want to sort the dictionary depending on values so that first item will be top score and last item will be least score. How can this be done?

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try this one

NSSortDescriptor *descriptor = 
    [[NSSortDescriptor alloc] initWithKey:@"Score" ascending:YES];
[items sortUsingDescriptors:[NSArray arrayWithObjects:descriptor,nil]];
[descriptor release];