抽象工厂的灵活性要比简单工程的灵活性强。

抽象工厂的UML图(第一次画UML图，可能关系和箭头的图意义有错误，但是请不要以建模规范去看图，以最基本的结合后面OC代码，理解相关关系)：

抽象工厂原理：

抽象工厂 较 简单工厂 多了抽象级别 而已。

因为需要创建抽象工厂，所以需要工厂管理器：

新建FactoryManager.h和FactoryManager.m:

FactoryManager.h:

1 #import 
       
         2 #import "BaseFactory.h" 3 #import "AppleFactory.h" 4 #import "GoogleFactory.h" 5  6 在抽象工厂类中为什么需要枚举列举工厂类，因为需要用户指定工厂， 7 然后让工厂来生产具体产品 8 typedef enum : NSUInteger { 9     10     kApple   = 0x11,11     kGoogle,12     13 } EFactoryType;14 15 @interface FactoryManager : NSObject16 17 /**18  *  获取工厂19  *20  *  @param factoryType 工厂类型21  *22  *  @return 创建出的工厂23  */24 + (BaseFactory *)factoryWithBrand:(EFactoryType)factoryType;25 26 @end
       

FactoryManager.h

FactoryManager.m:

1 #import "FactoryManager.h" 2  3 @implementation FactoryManager 4  5 + (BaseFactory *)factoryWithBrand:(EFactoryType)factoryType { 6      7     BaseFactory *factory = nil; 8      9     if (factoryType == kApple) {10         11         factory = [[AppleFactory alloc] init];12         13     } else if (factoryType == kGoogle) {14         15         factory = [[GoogleFactory alloc] init];16     }17     18     return factory;19 }20 21 @end

===============================================

建立具体工厂对应的父类工厂：

BaseFactory.h:

1 #import 
       
         2 #import "BasePhone.h" 3 #import "BaseWatch.h" 4  5 @interface BaseFactory : NSObject 6  7 /** 8  *  创建手机 9  *10  *  @return 手机11  */12 - (BasePhone *)createPhone;13 14 /**15  *  创建手表16  *17  *  @return 手表18  */19 - (BaseWatch *)createWatch;20 21 @end
       

BaseFactory.m:

1 #import "BaseFactory.h" 2  3 @implementation BaseFactory 4  5 - (BasePhone *)createPhone { 6      7     return nil; 8 } 9 10 - (BaseWatch *)createWatch {11     12     return nil;13 }14 15 @end

 

========================================================

关于继承的细节：

继承来自父类的方法，就不需要在子类的@interface声明中重写，直接在@implementation实现中实现父类的方法

========================================================

根据继承上面父类工厂新建两个具体工厂子类AppleFactory和GoogleFactory子类：

AppleFactory.h

#import "BaseFactory.h"

@interface AppleFactory : BaseFactory

@end

AppleFactory.m

#import "AppleFactory.h"

#import "iPhone.h"

#import "iWatch.h"

@implementation AppleFactory

- (BasePhone *)createPhone {

    

    return [[iPhone alloc] init];

}

- (BaseWatch *)createWatch {

    

    return [[iWatch alloc] init];

}

@end

=========================================================

GoogleFactory.m

#import "BaseFactory.h"

@interface GoogleFactory : BaseFactory

@end

GoogleFactory.h

#import "GoogleFactory.h"

#import "Android.h"

#import "AndroidWatch.h"

@implementation GoogleFactory

- (BasePhone *)createPhone {

    

    return [[Android alloc] init];

}

- (BaseWatch *)createWatch {

    

    return [[AndroidWatch alloc] init];

}

@end

=========================================================

手机也有抽象的父类

BasePhone.h:

#import <Foundation/Foundation.h>

@interface BasePhone : NSObject

@end

BasePhone.m:

#import "BasePhone.h"

@implementation BasePhone

@end

=========================================================

手机具体的子类

iPhone.h

#import "BasePhone.h"

@interface iPhone : BasePhone

@end

iPhone.m

#import "iPhone.h"

@implementation iPhone

@end

=========================================================

Android.h

#import "BasePhone.h"

@interface Android : BasePhone

@end

Android.m

#import "Android.h"

@implementation Android

@end

=========================================================

手表抽象的类

BaseWatch.h

#import <Foundation/Foundation.h>

@interface BaseWatch : NSObject

@end

BaseWatch.m

#import "BaseWatch.h"

@implementation BaseWatch

@end

=========================================================

手表具体的类

iWatch.h

1 #import "iWatch.h"2 3 @implementation iWatch4 5 @end

iWatch.m

1 #import "BaseWatch.h" 2  3 @interface AndroidWatch : BaseWatch 4  5 @end 6  7 #import "AndroidWatch.h" 8  9 @implementation AndroidWatch10 11 @end

=========================================================

客户端程序>>>>ViewController.m:

1 #import "ViewController.h" 2 #import "FactoryManager.h" 3  4 @interface ViewController () 5  6 @end 7  8 @implementation ViewController 9 10 - (void)viewDidLoad {11     12     [super viewDidLoad];13     14     // 获取工厂15     BaseFactory *factory = [FactoryManager factoryWithBrand:kGoogle];16     17     // 创建商品18     BasePhone *phone = [factory createPhone];19     BaseWatch *watch = [factory createWatch];20     21     NSLog(@"%@ %@", phone, watch);22 }23 24 @end