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)
9. 23种设计模式（九)

详述

十九、职责链模式——Chain of Responsibility

使多个对象都有机会处理请求，从而避免请求的发送者和接受者之间的耦合关系，将这个对象连成一条链传递该请求，直到有一个对象处理它为止。先看一下原理图。

职责链模式原理图

看代码组织结构。

代码组织结构

看代码。

1. ViewController.m

#import "ViewController.h"
#import "HCDMnager.h"
#import "HCDCommonManager.h"
#import "HCDMajorManager.h"
#import "HCDGenaralManager.h"
#import "HCDReuquest.h"
@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    HCDCommonManager *common = [[HCDCommonManager alloc]initWithName:@"猪经理"];
    HCDMajorManager *majon = [[HCDMajorManager alloc]initWithName:@"狗总监"];
    HCDGenaralManager *genaral = [[HCDGenaralManager alloc]initWithName:@"蛤蟆总经理"];
    common.superior = majon;
    majon.superior = genaral;
    
    HCDReuquest *request = [[HCDReuquest alloc]init];
    request.requestType = @"请假";
    request.number = 5;
    [common dealRequest:request];
    
    request.number = 20;
    [common dealRequest:request];
    
    request.number = 220;
    [common dealRequest:request];
    
    request.number = 1200;
    [common dealRequest:request];
}

@end

2. HCDMnager.h

#import <Foundation/Foundation.h>

@class HCDMnager,HCDReuquest;

@interface HCDMnager : NSObject

@property (nonatomic, copy) NSString *name;

@property (nonatomic, strong) HCDMnager *superior;

- (instancetype)initWithName:(NSString *)name;

- (void)dealRequest:(HCDReuquest *)request;

@end

3. HCDMnager.m

#import "HCDMnager.h"
#import "HCDReuquest.h"

@implementation HCDMnager

- (instancetype)initWithName:(NSString *)name
{
    self = [super init];
    if (self) {
        _name = name;
    }
    return self;
}

- (void)dealRequest:(HCDReuquest *)request
{
    
}

@end

4. HCDReuquest.h

#import <Foundation/Foundation.h>

@interface HCDReuquest : NSObject

@property (nonatomic, copy) NSString *requestType;
@property (nonatomic, assign) NSInteger number;

@end

5. HCDReuquest.m

#import "HCDReuquest.h"

@implementation HCDReuquest

@end

6. HCDCommonManager.h

#import "HCDMnager.h"

@interface HCDCommonManager : HCDMnager

@end

7. HCDCommonManager.m

#import "HCDCommonManager.h"
#import "HCDReuquest.h"

@implementation HCDCommonManager

- (void)dealRequest:(HCDReuquest *)request
{
    if ([request.requestType isEqualToString:@"请假"] && request.number < 10) {
        NSLog(@"%@处理了%@,时间是%ld",self.name,request.requestType,request.number);
    }
    else{
        [self.superior dealRequest:request];
    }
}

@end

8. HCDMajorManager.h

#import "HCDMnager.h"

@interface HCDMajorManager : HCDMnager

@end

9. HCDMajorManager.m

#import "HCDMajorManager.h"
#import "HCDReuquest.h"

@implementation HCDMajorManager

- (void)dealRequest:(HCDReuquest *)request
{
    if ([request.requestType isEqualToString:@"请假"] && request.number < 50) {
        NSLog(@"%@处理了%@,时间是%ld",self.name,request.requestType,request.number);
    }
    else{
        [self.superior dealRequest:request];
    }
}

@end

10. HCDGenaralManager.h

#import "HCDMnager.h"

@interface HCDGenaralManager : HCDMnager

@end

11. HCDGenaralManager.m

#import "HCDGenaralManager.h"
#import "HCDReuquest.h"

@implementation HCDGenaralManager

- (void)dealRequest:(HCDReuquest *)request
{
    if ([request.requestType isEqualToString:@"请假"] && request.number < 500) {
        NSLog(@"%@处理了%@,时间是%ld",self.name,request.requestType,request.number);
    }
    else{
        NSLog(@"%@不同意%@,时间是%ld",self.name,request.requestType,request.number);
    }
}

@end

看结果。

2017-04-29 10:58:55.169 19职责链模式[1184:25440] 猪经理处理了请假,时间是5
2017-04-29 10:58:55.170 19职责链模式[1184:25440] 狗总监处理了请假,时间是20
2017-04-29 10:58:55.170 19职责链模式[1184:25440] 蛤蟆总经理处理了请假,时间是220
2017-04-29 10:58:55.170 19职责链模式[1184:25440] 蛤蟆总经理不同意请假,时间是1200

结论：思想。

---

二十、中介者模式——Mediator

  用一个中介对象来封装一系列的对象交互，中介者使各个对象不需要显式地相互引用，从而使其耦合松散，而且可以独立地改变它们之间的交互。先看一下原理示例图。

中介者模式示例图

下面看一下代码结构图。

中介者模式代码组织结构

下面看代码。

1. ViewController.m

#import "ViewController.h"
#import "HCDColleagueA.h"
#import "HCDColleagueB.h"
#import "HCDAbstractMediator.h"
#import "HCDMediator.h"
@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    HCDAbstractColleague *colleagueA = [[HCDColleagueA alloc]init];
    HCDAbstractColleague *colleagueB = [[HCDColleagueB alloc]init];
    
    HCDAbstractMediator *mediator = [[HCDMediator alloc]initWithColleagueA:colleagueA colleagueB:colleagueB];
    colleagueA.mediator = mediator;
    colleagueB.mediator = mediator;
    
    colleagueA.number = 1450;
    colleagueB.number = 1450;
    [colleagueA notice];
    NSLog(@"%f---%f",colleagueA.number,colleagueB.number);
    colleagueB.number = 123;
    [colleagueB notice];
    NSLog(@"%f---%f",colleagueA.number,colleagueB.number);
}

@end

2. HCDAbstractColleague.h

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

@class HCDAbstractMediator;

@interface HCDAbstractColleague : NSObject

@property (nonatomic, assign) CGFloat number;

- (void)notice;

@property(nonatomic,strong) HCDAbstractMediator *mediator;

@end

3. HCDAbstractColleague.m

#import "HCDAbstractColleague.h"
#import "HCDAbstractMediator.h"

@implementation HCDAbstractColleague

@end

4. HCDMediator.h

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

@interface HCDMediator : HCDAbstractMediator

@end

5. HCDMediator.m

#import "HCDMediator.h"

@implementation HCDMediator

@synthesize colleagueB = _colleagueB;
@synthesize colleagueA = _colleagueA;

- (instancetype)initWithColleagueA:(HCDAbstractColleague *)colleagueA colleagueB:(HCDAbstractColleague *)colleagueB
{
    self = [super init];
    if (self) {
        _colleagueA = colleagueA;
        _colleagueB = colleagueB;
    }
    return self;
}

- (void)setValueToColleagueA:(CGFloat)value
{
    self.colleagueA.number = value * 100;
}

- (void)setValueToColleagueB:(CGFloat)value
{
    self.colleagueB.number = value * 0.01;
}

@end

6. HCDColleagueA.h

#import "HCDAbstractColleague.h"

@interface HCDColleagueA : HCDAbstractColleague

@end

7. HCDColleagueA.m

#import "HCDColleagueA.h"
#import "HCDAbstractMediator.h"

@implementation HCDColleagueA

- (void)notice
{
    [self.mediator setValueToColleagueB:self.number];
}

@end

8. HCDColleagueB.h

#import "HCDAbstractColleague.h"

@interface HCDColleagueB : HCDAbstractColleague

@end

9. HCDColleagueB.m

#import "HCDColleagueB.h"
#import "HCDAbstractMediator.h"

@implementation HCDColleagueB

- (void)notice
{
    [self.mediator setValueToColleagueA:self.number];
}

@end

10. HCDAbstractMediator.h

#import <Foundation/Foundation.h>
#import "HCDColleagueB.h"
#import "HCDColleagueA.h"

@interface HCDAbstractMediator : NSObject

- (instancetype)initWithColleagueA:(HCDAbstractColleague *)colleagueA colleagueB:(HCDAbstractColleague *)colleagueB;

@property (nonatomic, weak) HCDAbstractColleague *colleagueA;
@property (nonatomic, weak) HCDAbstractColleague *colleagueB;

- (void)setValueToColleagueA:(CGFloat)value;
- (void)setValueToColleagueB:(CGFloat)value;

@end

11. HCDAbstractMediator.m

#import "HCDAbstractMediator.h"

@implementation HCDAbstractMediator

@end

看结果。

2017-04-29 11:23:14.332 20中介者模式[1615:39216] 1450.000000---14.500000
2017-04-29 11:23:14.333 20中介者模式[1615:39216] 12300.000000---123.000000

结论：思想。

后记

  今天是五一放假的第一天，起来的有点晚，大约十点多才起床，起来了以后才想起来有一篇还没写，就接着写了，下午再写一篇，给23种设计模式一个了结，再次谢谢大家。

大海美图