Objective-C Programming: The Big Nerd Ranch Guide

19 Properties

Objective-C has a convenient shortcut called properties that lets you skip declaring instance variables and declaring and implementing accessor methods. Using properties simplifies your class’s code.

Declaring properties

In BNRPerson.h, remove the instance variable and accessor method declarations and replace them with two properties: heightInMeters and weightInKilos.

#import <Foundation/Foundation.h>

@interface BNRPerson : NSObject

// BNRPerson has two properties
@property (nonatomic) float heightInMeters;
@property (nonatomic) int weightInKilos;

{
    // BNRPerson has two instance variables
    float _heightInMeters;
    int _weightInKilos;
}

// BNRPerson has methods to read and set its instance variables
- (float)heightInMeters; ...