版本记录

版本号	时间
V1.0	2017.04.29

前言

前面讲了23种设计模式中的前几个，下面我们继续，先看前几篇文章。
1. 23种设计模式（一)
2. 23种设计模式（二）
3. 23种设计模式（三)
4. 23种设计模式（四)
5. 23种设计模式（五)
6. 23种设计模式（六)
7. 23种设计模式（七)
8. 23种设计模式（八)

详述

十七、桥接模式——Bridge

  将抽象部分与它的实现部分分离，使它们都可以独立地变化。先看一张原理图。

桥接模式原理图

在看一下写的代码结构图。

代码结构原理图

下面看代码。

1. ViewController.m

#import "ViewController.h"
#import "HCDPhone.h"
#import "HCDNokiaPhone.h"
#import "HCDSonyPhone.h"
#import "HCDSoftware.h"
#import "HCDGameSoftware.h"
#import "HCDGameNokiaSoftware.h"
#import "HCDAddressListSofeware.h"

typedef id<HCDSoftware> HCDSoftware;

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    HCDPhone *phone = [[HCDNokiaPhone alloc]init];
    HCDSoftware software = [[HCDGameNokiaSoftware alloc]init];
    [phone setSoftWare:software];
    [phone playSoftPhone];
    software = [[HCDAddressListSofeware alloc]init];
    [phone setSoftWare:software];
    [phone playSoftPhone];
    
}

@end

2. HCDPhone.h

#import <Foundation/Foundation.h>
#import "HCDSoftware.h"

@interface HCDPhone : NSObject

@property (nonatomic, strong) id<HCDSoftware> softWare;

- (void)playSoftPhone;

@end

3. HCDPhone.m

#import "HCDPhone.h"

@implementation HCDPhone

- (void)playSoftPhone
{
    [self.softWare run];
}

@end

4. HCDNokiaPhone.h

#import "HCDPhone.h"

@interface HCDNokiaPhone : HCDPhone

@end

5. HCDNokiaPhone.m

#import "HCDNokiaPhone.h"

@implementation HCDNokiaPhone

@end

6. HCDSonyPhone.h

#import "HCDPhone.h"

@interface HCDSonyPhone : HCDPhone

@end

7. HCDSonyPhone.m

#import "HCDSonyPhone.h"

@implementation HCDSonyPhone

@end

8. HCDSoftware.h

#import <Foundation/Foundation.h>

@protocol HCDSoftware <NSObject>

- (void)run;

@end

9. HCDGameSoftware.h

#import <Foundation/Foundation.h>
#import "HCDSoftware.h"

@interface HCDGameSoftware : NSObject <HCDSoftware>

@end

10. HCDGameSoftware.m

#import "HCDGameSoftware.h"

@implementation HCDGameSoftware

- (void)run
{
    NSLog(@"运行游戏手机软件");
}

@end

11. HCDAddressListSofeware.h

#import <Foundation/Foundation.h>
#import "HCDSoftware.h"

@interface HCDAddressListSofeware : NSObject <HCDSoftware>

@end

12. HCDAddressListSofeware.m

#import "HCDAddressListSofeware.h"

@implementation HCDAddressListSofeware

- (void)run
{
    NSLog(@"运行通讯录手机软件");
}

@end

13. HCDGameNokiaSoftware.h

#import "HCDGameSoftware.h"

@interface HCDGameNokiaSoftware : HCDGameSoftware

@end

14. HCDGameNokiaSoftware.m

#import "HCDGameNokiaSoftware.h"

@implementation HCDGameNokiaSoftware

- (void)run
{
    NSLog(@"运行Nokia的游戏软件");
}

@end

看结果。

2017-04-29 00:24:34.060 17桥接模式[2452:86743] 运行Nokia的游戏软件
2017-04-29 00:24:34.060 17桥接模式[2452:86743] 运行通讯录手机软件

结论：思想。

---

十八、命令模式——Command

  将一个请求封装为一个对象，从而使你可用不同的请求对客户进行参数化，对请求排队或记录请求日志，以及支持可撤销的操作。
先看一下代码结构图。

代码结构图

下面看代码。

1. ViewController.m

#import "ViewController.h"
#import "HCDWaiter.h"
#import "HCDCustomr.h"
#import "HCDWorker.h"
@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    HCDWaiter *waiter = [[HCDWaiter alloc]init];
    HCDCustomr *customer = [[HCDCustomr alloc]init];
    [waiter addOrder:[customer pushOrderWithString:@"十串羊肉" type:YES]];
    HCDCustomr *customer1 = [[HCDCustomr alloc]init];
    [waiter addOrder:[customer1 pushOrderWithString:@"二十串鸡肉" type:NO]];
    [waiter notifyOrder];
    
}


@end

2. HCDOrder.h

#import <Foundation/Foundation.h>
#import "HCDOrder.h"
#import "HCDWorker.h"

@interface HCDOrder : NSObject

@property (nonatomic, copy) NSString *orderString;

- (instancetype)initWithOrderString:(NSString *)orderString;

- (void)executeOrder;

@end

3. HCDOrder.m

#import "HCDOrder.h"

@implementation HCDOrder

- (instancetype)initWithOrderString:(NSString *)orderString
{
    self = [super init];
    if (self) {
        _orderString = orderString;
    }
    return self;
}

@end

4. HCDMuttonOrder.h

#import "HCDOrder.h"

@interface HCDMuttonOrder : HCDOrder

@end

5. HCDMuttonOrder.m

#import "HCDMuttonOrder.h"

@implementation HCDMuttonOrder

- (void)executeOrder
{
    [[HCDWorker sharedWorker] doMuttonWork:self.orderString];
}

@end

6. HCDChickenOrder.h

#import "HCDOrder.h"

@interface HCDChickenOrder : HCDOrder

@end

7. HCDChickenOrder.m

#import "HCDChickenOrder.h"

@implementation HCDChickenOrder

- (void)executeOrder
{
    [[HCDWorker sharedWorker] doChickenWork:self.orderString];
}

@end

8. HCDWorker.h

#import <Foundation/Foundation.h>

@interface HCDWorker : NSObject

+ (instancetype)sharedWorker;

- (void)doMuttonWork:(NSString *)work;

- (void)doChickenWork:(NSString *)work;

@end

9. HCDWorker.m

#import "HCDWorker.h"

@implementation HCDWorker

+ (instancetype)sharedWorker
{
    static dispatch_once_t once;
    static HCDWorker *sharedWorker = nil;
    dispatch_once(&once, ^{
        sharedWorker = [[HCDWorker alloc]init];
    });
    return sharedWorker;
}

- (void)doMuttonWork:(NSString *)work
{
    NSLog(@"厨师考羊肉:%@",work);
}

- (void)doChickenWork:(NSString *)work
{
    NSLog(@"厨师考鸡肉:%@",work);
}

@end

10. HCDWaiter.h

#import <Foundation/Foundation.h>
#import "HCDOrder.h"
#import "HCDMuttonOrder.h"
#import "HCDChickenOrder.h"

@interface HCDWaiter : NSObject

- (void)addOrder:(HCDOrder *)order;

- (void)deleteOrder:(HCDOrder *)order;

- (void)notifyOrder;

@end

11. HCDWaiter.m

#import "HCDWaiter.h"

@interface HCDWaiter ()

@property (nonatomic, strong) NSMutableArray *orderList;

@end

@implementation HCDWaiter

- (instancetype)init
{
    self = [super init];
    if (self) {
        _orderList = [NSMutableArray array];
    }
    return self;
}

- (void)addOrder:(HCDOrder *)order
{
    [self.orderList addObject:order];
}

- (void)deleteOrder:(HCDOrder *)order
{
    [self.orderList removeObject:order];
}

- (void)notifyOrder
{
    for (HCDOrder *order in self.orderList) {
        [order executeOrder];
    }
}

@end

12. HCDCustomr.h

#import <Foundation/Foundation.h>

@class HCDOrder,HCDMuttonOrder,HCDChickenOrder;

@interface HCDCustomr : NSObject

- (HCDOrder *)pushOrderWithString:(NSString *)string type:(BOOL)type;

@end

13. HCDCustomr.m

#import "HCDCustomr.h"
#import "HCDMuttonOrder.h"
#import "HCDChickenOrder.h"

@implementation HCDCustomr

- (HCDOrder *)pushOrderWithString:(NSString *)string type:(BOOL)type
{
    HCDOrder *order = nil;
    if (type) {
       order = [[HCDMuttonOrder alloc]initWithOrderString:string];
    }else{
       order = [[HCDChickenOrder alloc]initWithOrderString:string];
    }
    return order;
}

@end

下面直接看结果。

2017-04-29 01:08:20.581 18命令模式[2961:109594] 厨师考羊肉:十串羊肉
2017-04-29 01:08:20.581 18命令模式[2961:109594] 厨师考鸡肉:二十串鸡肉

结论：注意思想。

后记

  今晚就写这么多了，祝大家也祝我自己五一快乐！未完，待续！谢谢，各位晚安！！

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