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iterator、singleton模式
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‎da-hua-she-ji-mo-shi/20-iterator/README.md

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# 迭代器模式
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## 什么是迭代器模式?
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提供一种方法顺序访问一个聚合对象中各个元素，而又不暴露该对象的内部表示
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## 迭代器模式有哪些优点?
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## 迭代器模式有哪些缺点?
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## 适用场景
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* 一个聚集对象， 且不管这些对象是什么，都需要遍历的时候
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‎da-hua-she-ji-mo-shi/20-iterator/iterator/iterator.xcodeproj/project.pbxproj

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‎da-hua-she-ji-mo-shi/20-iterator/iterator/iterator.xcodeproj/project.xcworkspace/contents.xcworkspacedata

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‎da-hua-she-ji-mo-shi/20-iterator/iterator/iterator.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

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‎da-hua-she-ji-mo-shi/20-iterator/iterator/iterator/iterator/Aggreagate.h

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//
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// Aggreagate.h
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// iterator
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//
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// Created by 王俊 on 2018/12/28.
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// Copyright © 2018 王俊. All rights reserved.
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//
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#ifndef Aggreagate_h
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#define Aggreagate_h
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@protocol Iterator;
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@protocol Aggregate <NSObject>
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@required
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- (id<Iterator>)createIterator;
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- (NSUInteger)count;
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- (id)firstObject;
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- (void)addObject:(id)anObject;
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- (id)objectAtIndex:(NSUInteger)index;
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@end
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#endif /* Aggreagate_h */

‎da-hua-she-ji-mo-shi/20-iterator/iterator/iterator/iterator/ConcreteAggregate.h

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//
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// ConcreteAggregate.h
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// iterator
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//
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// Created by 王俊 on 2018/12/28.
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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 "Aggreagate.h"
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NS_ASSUME_NONNULL_BEGIN
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@interface ConcreteAggregate : NSObject<Aggregate>
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@end
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NS_ASSUME_NONNULL_END

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