Objective-C边学边记-5：XCode源文件组织

@class关键字
如要需要导入某类的功能代码则需要包含这个类的.h文件，如果只需要知道这个东西是个类（如某文件中如下声明： Person *person; ）使用@class就可以了（@class Person;)。正确的使用@class指令能够减少编译时间。

源文件组织示例：

 

 

//
//  Tire.h
//  car4
//
//  Created by Elf Sundae on 10-10-20.
//  Copyright 2010 __MyCompanyName__. All rights reserved.
//

#import <Cocoa/Cocoa.h>

@interface Tire : NSObject
@end

 

 

 

 

//
//  Tire.m
//  car4
//
//  Created by Elf Sundae on 10-10-20.
//  Copyright 2010 __MyCompanyName__. All rights reserved.
//

#import "Tire.h"


@implementation Tire

- (NSString *) description
{
	return(@"I am a Tire");
}
@end

 

 

 

 

//
//  Engine.h
//  汽车引擎
//
//  Created by Elf Sundae on 10-10-20.
//  Copyright 2010 __MyCompanyName__. All rights reserved.
//

#import <Cocoa/Cocoa.h>


@interface Engine : NSObject
@end

 

 

 

 

//
//  Engine.m
//  
//	
//
//  Created by Elf Sundae on 10-10-20.
//  Copyright 2010 __MyCompanyName__. All rights reserved.
//

#import "Engine.h"


@implementation Engine

- (NSString *) description
{
	return  (@"I am a Engine");
}

@end

 

 

 

//
//  V8.h
//  car4
//
//  Created by Elf Sundae on 10-10-20.
//  Copyright 2010 __MyCompanyName__. All rights reserved.
//

#import <Cocoa/Cocoa.h>
#import "Engine.h"


// *******************
// V8 Engine Class
@interface V8 : Engine
@end

 

//
//  V8.m
//  car4
//
//  Created by Elf Sundae on 10-10-20.
//  Copyright 2010 __MyCompanyName__. All rights reserved.
//

#import "V8.h"


@implementation V8

- (NSString *) description
{
	return @"I am a V8 Engine!";
}

@end // V8

 

 

//
//  Car.h
//  car4
//
//  Created by Elf Sundae on 10-10-20.
//  Copyright 2010 __MyCompanyName__. All rights reserved.
//

#import <Cocoa/Cocoa.h>

@class Engine;
@class Tire;


@interface Car : NSObject
{
	Engine *engine;
	Tire *tires[4];
}
// 添加getter,setter
- (Engine *) engine;
- (void) setEngine:(Engine *) m_engine;

- (Tire *) tireAtIndex: (int) index;	//通过索引器访问该属性
- (void) setTire: (Tire *) m_tire : (int) index;

- (void) print;

@end

 

 

//
//  Car.m
//  car4
//
//  Created by Elf Sundae on 10-10-20.
//  Copyright 2010 __MyCompanyName__. All rights reserved.
//

#import "Car.h"
#import "Engine.h"
#import "Tire.h"


@implementation Car


//- (id) init	// 初始化Car
//{
//	if (self = [super init]) {
//		engine = [Engine new];
//		
//		tires[0] = [Tire new];
//		tires[1] = [Tire new];
//		tires[2] = [Tire new];
//		tires[3] = [Tire new];
//	}
//	
//	return self;
//}

- (Engine *) engine
{
	return engine;
}

- (void) setEngine:(Engine *)m_engine
{
	engine = m_engine;
}

- (Tire *) tireAtIndex:(int)index
{
	if (index < 0 || index > 3)
	{
		NSLog(@"bad index (%d) in \"tireAtIndex:\"",
		      index);
		
		exit(1);
	}
	
	return tires[index];
}


- (void) setTire:(Tire *)m_tire :(int)index
{
	if (index < 0 || index >3)
	{
		NSLog(@"bad index (%d) in \"setTire:atIndex\"",
		      index);
		exit(1);
	}
	tires[index] = m_tire;
}
- (void) print
{
	NSLog(@"%@",engine);
	NSLog(@"%@",tires[0]);
	NSLog(@"%@",tires[1]);
	NSLog(@"%@",tires[2]);
	NSLog(@"%@",tires[3]);
	
}


@end

 

//
//  WeatherRadial.h
//  car4
//
//  Created by Elf Sundae on 10-10-20.
//  Copyright 2010 __MyCompanyName__. All rights reserved.
//

#import <Cocoa/Cocoa.h>
#import "Tire.h"

// *******************
// WeatherRadial Tire
@interface WeatherRadial : Tire
@end

 

 

//
//  WeatherRadial.m
//  car4
//
//  Created by Elf Sundae on 10-10-20.
//  Copyright 2010 __MyCompanyName__. All rights reserved.
//

#import "WeatherRadial.h"

@implementation WeatherRadial

-  (NSString *) description
{
	return (@"I am a WeatherRadial Tire!!");
}

@end

 

 

#import <cocoa/Cocoa.h>
#import "Engine.h"		// 因为V8.h和WeatherRadial.h中				
#import "Tire.h"		// 已经包含Engine.h和Tire.h，此处可不用导入
#import "Car.h"
#import "V8.h"
#import "WeatherRadial.h"


/*
 * car4: 联系组织项目文件 
 *
 */




int main (int argc, const char * argv[]) {

	
	Car *car;
	car = [Car new];
	V8 *engine = [V8 new];
	[car setEngine: engine];


	
	int i;
	for (i = 0; i < 4; i++)
	{
		WeatherRadial *tire = [WeatherRadial new];
		[car setTire:tire :i];
	}

	[car print];
	
	return 0 ;
	
}