Question

I want to know how to copmare first letter between two strings, like string1 begins with letter ‘a’ and string2 begins with letter ‘b’ then string1 must displayed first.

Answer 1

This doesn’t strictly conform to UNICODE string comparison rules, which are complex for non-latin alphabets, but is quick at least:

NSString *first = [string1 characterAtIndex:0] <= [string2 characterAtIndex:0] ? string1 : string2;