Programming in Objective-C, Sixth Edition

String Objects

You have encountered string objects in your programs before. Whenever you enclosed a sequence of character strings inside a pair of double quotes, as in

@"Programming is fun"

you created a character string object in Objective-C. The Foundation framework supports a class called NSString for working with character string objects. Whereas C-style strings consist of char characters, NSString objects consist of unichar characters. A unichar character is a multibyte character according to the Unicode standard. This enables you to work with character sets that can contain literally millions of characters. Luckily, you don’t have to worry about the internal representation of the characters in your strings because the NSString class automatically ...