How to convert english numbers inside a string to Persian/Arabic numbers in Objective-C?

Question

I have an english string that may or may not have numbers. But i want those numbers to be printed on screen as Persian numbers.

For example if NSString *foo =

Answer 1

I'm afraid there is no other way than replacing them.

e.g.:

str =[str stringByReplacingOccurrencesOfString:@"0" withString:@"۰"];
.
.
.