Thank you for your reply, but I need to sort the result of a simple “query” ignoring case. Your suggestion applies for searching and comparing.
SQL speaking, I need an ORDER BY firstName ASC, and this command must be case insensitive for my usage.
I have done some Googling and I ended reading the NSSortDescriptor Class reference, and I could find the answer for my question. The solution is setting a selector to the sort descriptor as follow:
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"firstName" ascending:YES selector:@selector(caseInsensitiveCompare:)];
I hope it will be useful for more people.