You want work with strings in Objective-C

Use NSString and NSMutableString classes.

The NSString and NSMutableString classes allow you to store a string of characters in memory. The NSString class is immutable, meaning that once it is created, its contents cannot be modified. Mutable strings represented with the NSMutableString can be modified once they are created. We will see an example of both of these classes very soon.

Objective-C strings should be placed inside double quotes. The starting double-quote should be prefixed with an at sign (@). For instance, the sentence Hello, World, represented as a string in Objective-C, is written like so: