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facdade 模式
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‎da-hua-she-ji-mo-shi/12-facade/README.md

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# 外观模式
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## 什么是外观模式?
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为一个系统中的一组接口提供一个一致的界面，此模式定义了一个高层接口，这个接口使得这一子系统更加容易使用
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## 外观模式有哪些优点?
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* 隐藏复杂逻辑，简化使用方式
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## 外观模式有哪些缺点?
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* 新增子系统时，可能需要修改外观代码，违反了开闭原则
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## 适用场景
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* 系统分层
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* 降低与大量子系统的耦合
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‎da-hua-she-ji-mo-shi/12-facade/facade/facade.xcodeproj/project.pbxproj

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‎da-hua-she-ji-mo-shi/12-facade/facade/facade.xcodeproj/project.xcworkspace/contents.xcworkspacedata

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‎da-hua-she-ji-mo-shi/12-facade/facade/facade.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

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‎da-hua-she-ji-mo-shi/12-facade/facade/facade/facade/Fund.h

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//
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// Fund.h
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// facade
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//
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// Created by 王俊 on 2018/12/17.
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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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NS_ASSUME_NONNULL_BEGIN
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@interface Fund : NSObject
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- (void)buyFund;
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- (void)sellFund;
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@end
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NS_ASSUME_NONNULL_END

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