gistfile1.txt

NSArray *sortedFirstNames = [firstNames sortedArrayUsingFunction:familyNameCompare context:NULL];


NSInteger familyNameCompare(NSString *one, NSString *two, void *context)
{

    NSArray *sortedFamilyNames = [[FirstNamesAndFamilyNames allValues] sortedArrayUsingSelector:@selector(caseInsensitiveCompare:)];	

    NSString *oneName = [FirstNamesAndFamilyNames objectForKey:one];
    NSString *twoName = [FirstNamesAndFamilyNames objectForKey:two];	

    if ([sortedFamilyNames indexOfObject:oneName] < [sortedFamilyNames indexOfObject:twoName]){
        return NSOrderedAscending;
    }else if ([sortedFamilyNames indexOfObject:oneName] > [sortedFamilyNames indexOfObject:twoName]){
        return NSOrderedDescending;
    }else{
        return NSOrderedSame;
    }	
}