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composite 模式
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‎da-hua-she-ji-mo-shi/19-composite/README.md

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# 组合模式
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## 什么是组合模式?
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将对象组合成树形结构，以表示**“部分-整体”**的层次结构。组合模式使得用户对单个对象和组合对象的使用具有一致性
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## 组合模式有哪些优点?
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* 灵活性高，比较容易增加移除构件
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* 高层模块调用简单，调用整体和调用局部没有区别
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## 组合模式有哪些缺点?
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* 与依赖倒置原则冲突
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## 适用场景
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* 需求中是体现部分与整体层次的结构时
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* 希望用户可以忽略组合对象与单个对象的不同，统一的使用组合结构中的所有对象时
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‎da-hua-she-ji-mo-shi/19-composite/composite/composite.xcodeproj/project.pbxproj

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‎da-hua-she-ji-mo-shi/19-composite/composite/composite.xcodeproj/project.xcworkspace/contents.xcworkspacedata

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‎da-hua-she-ji-mo-shi/19-composite/composite/composite.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

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‎da-hua-she-ji-mo-shi/19-composite/composite/composite/composite/Company.h

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//
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// Company.h
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// composite
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//
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// Created by 王俊 on 2018/12/27.
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// Copyright © 2018 王俊. All rights reserved.
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//
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#ifndef Company_h
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#define Company_h
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@protocol Company <NSObject>
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@required
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@property (nonatomic, copy) NSString *name;
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- (id<Company>)initWithName:(NSString *)name;
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- (void)addCompany:(id<Company>)company;
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- (void)removeCompany:(id<Company>)company;
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- (void)display:(NSInteger)depth;
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- (void)lineOfDuty;
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@end
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#endif /* Company_h */

‎da-hua-she-ji-mo-shi/19-composite/composite/composite/composite/ConcreteCompany.h

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//
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// ConcreteCompany.h
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// composite
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//
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// Created by 王俊 on 2018/12/27.
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// Copyright © 2018 王俊. All rights reserved.
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//
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#import <Foundation/Foundation.h>
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#import "Company.h"
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NS_ASSUME_NONNULL_BEGIN
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@interface ConcreteCompany : NSObject<Company>
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@end
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NS_ASSUME_NONNULL_END

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