Objective-C Programming: The Big Nerd Ranch Guide

18 Your First Class

So far, you have only used classes created by Apple. Now you get to write your own class. Remember that a class describes objects in two ways: instance variables within each instance of the class and methods implemented by the class.

You are going to write a BNRPerson class, which will be similar to the struct Person you wrote in Chapter 11. This class, like all Objective-C classes, will be defined in two files:

• BNRPerson.h is the class’s header and will contain the declarations of instance variables and methods.

• BNRPerson.m is the implementation file. This is where you write out the code for, or implement, each method.

First, create a new project: a Foundation Command Line Tool named BMITime ...