Learning Objective-C 2.0: A Hands-on Guide to Objective-C for Mac and iOS Developers, Second Edition

18. A Few More Things

This chapter covers three small items that are new with Mountain Lion and Xcode 4.4. They are enums with a fixed underlying type and some type checking, the elimination of the need for forward declarations for methods in the @implementation section of a class, and a new piece of documentation that will help you keep track of when new Objective-C features were added to the language and what versions of OS X and iOS support those new features.

Enums with a Fixed Underlying Type

Standard C language enumeration constants or enums (see Chapter 1, “C, the Foundation of Objective-C”) are a way of giving human-readable names to a set of integer constants.

typedef enum{    soup,    pasta,    chicken,    cake} foods;...foods mainCourse ...