CHAPTER 1: Application Development
13
1.5 Code Property Assessors with @synthesize
Problem
Custom classes need to represent the attributes of the entities they are
modeling. You need to know how to define and implement properties in
Objective-C to do this. If you don’t want to code your own getter and setter
methods, you can use the @synthesize as an alternative.
Solution
To implement properties with @synthesize, you still need to declare properties in
the class interface as you did in Recipe 1.4 and implement these properties in
the class implementation. However, instead of writing your own assessor code,
you can use the @synthesize keyword to direct the complier to fill in the code for
you in the background during the compilation process.
How It Works
The first place you go when adding properties to classes is the custom class
header file. All you need to do with this method is to declare a property. Here is
what an interface looks like:
#import <Foundation/Foundation.h>
@interface Car : NSObject
@property(strong) NSString *name;
@end
The second file you need to go to implement a property is the implementation,
which in your example is located in Car.m. All you need to do here is use the
@synthesize keyword and include the property that you want to generate getters
and setters for (after the @implementation keyword).
#import "Car.h"
@implementation Car
@synthesize name;
@end
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