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memento 模式
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‎da-hua-she-ji-mo-shi/18-memento/README.md‎

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# 备忘录模式
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## 什么是备忘录模式?
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在不破坏封装性的前提下，捕获一个对象的内部状态，并在该对象之外保存这个状态。这样以后就可以将该对象恢复至原先保存的状态
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## 备忘录模式有哪些优点?
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* 解耦合，对象无需关心状态管理
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## 备忘录模式有哪些缺点?
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* 状态较多时，可能会造成较大的资源消耗
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## 适用场景
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* 功能比较复杂，但需要维护或记录属性历史的类
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* 需要保存的属性，只是众多属性中的一小部分
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‎da-hua-she-ji-mo-shi/18-memento/memento/memento.xcodeproj/project.pbxproj‎

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‎da-hua-she-ji-mo-shi/18-memento/memento/memento.xcodeproj/project.xcworkspace/contents.xcworkspacedata‎

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Some generated files are not rendered by default. Learn more about customizing how changed files appear on GitHub.

‎da-hua-she-ji-mo-shi/18-memento/memento/memento.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist‎

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<plist version="1.0">
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‎da-hua-she-ji-mo-shi/18-memento/memento/memento/main.m‎

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//
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// main.m
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// memento
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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 "./memento/GameRole.h"
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#import "./memento/RoleStateMemento.h"
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#import "./memento/RoleStateCaretaker.h"
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int main(int argc, const char * argv[]) {
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@autoreleasepool {
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// insert code here...
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// NSLog(@"Hello, World!");
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// 战斗前
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GameRole *lixiaoyao = [GameRole new];
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[lixiaoyao getInitState];
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[lixiaoyao stateDisplay];
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// 保存进度
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RoleStateCaretaker *stateAdmin = [RoleStateCaretaker new];
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stateAdmin.memento = [lixiaoyao saveState];
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// 战斗后
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[lixiaoyao fight];
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[lixiaoyao stateDisplay];
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// 恢复状态
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[lixiaoyao recoveryState:stateAdmin.memento];
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[lixiaoyao stateDisplay];
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}
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return 0;
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}

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