NSDictionary 用于保存具有映射关系的数据，NSDictionary 包含两组数据，一组用来保存key值，一组用来保存valure值。

一个Key可以对应多个value，反过来则不可以。

//
//  main.m
//  NSDictionary
//
//  Created by mac on 14-12-4.
//  Copyright (c) 2014年 mac. All rights reserved.
//

#import<Foundation/Foundation.h>

void staticCreatDictionary()
{
    NSDictionary * dict = [NSDictionarydictionary];
    dict = [NSDictionarydictionaryWithObject:@"dictonary0"forKey:@"key1"];
    dict = [NSDictionarydictionaryWithObjectsAndKeys:@"Dictionary1",@"key2",@"Dictionary2",@"key3",@"Dictionary3",@"key4",nil];
   
    NSDictionary * dict1 = [NSDictionarydictionaryWithDictionary:dict];
   
    NSLog(@"DICTIONARY:%@",dict1);
   
    NSArray * keyArray = [NSArrayarrayWithObjects:@"k1",@"k2",@"k3",@"k4",@"k5",nil];
    NSArray * valureArray = [NSArrayarrayWithObjects:@"Hello1",@"Hello2",@"Hello3",@"Hello4",@"Hello5",nil];
    //通过数组创建
    dict = [NSDictionarydictionaryWithObjects:valureArrayforKeys:keyArray];
    NSLog(@"%@",dict);
   
    //通过文件创建
    NSDictionary * dict3 ;
    dict3 = [NSDictionarydictionaryWithContentsOfFile:@"/Users/mac/desktop/a.txt"];
    NSLog(@"Ditc3:%@",dict3);
   
}

void others()
{   NSDictionary * dict ;
    dict = [NSDictionarydictionaryWithObjectsAndKeys:@"Dictionary1",@"key2",@"Dictionary2",@"key3",@"Dictionary3",@"key4",nil];
    //计数字典大小
    NSUInteger count = [dictcount];
    NSLog(@"%lu",count);
   
    //判断是否两个字典是否相同
    NSDictionary * dict1;
    dict1 = [NSDictionarydictionaryWithObject:@"dictonary0"forKey:@"key1"];
    NSLog(@"%i",[dictisEqualToDictionary:dict1]);
   
    [dict writeToFile:@"/Users/mac/desktop/a.txt"atomically:YES];
   
}

void keyAndValure()
{
    NSDictionary * dict3 ;
    dict3 = [NSDictionarydictionaryWithContentsOfFile:@"/Users/mac/desktop/a.txt"];
    //返回所有key
    NSArray * keysAtrray = [dict3allKeys];
    NSLog(@"%@",keysAtrray);
    //返回一个对象对应的所有key
    NSArray * keyArray = [dict3allKeysForObject:@"Dictionary1"];
    NSLog(@"%@",keyArray);
   
    //返回一个key对应的valure
    id obj = [dict3objectForKey:@"key2"];
    NSLog(@"%@",obj);
    //返回一组key对应的valure
    NSArray * valureArray = [dict3objectsForKeys:keysAtrraynotFoundMarker:@"NoFound"];
    NSLog(@"%@",valureArray);
   
}

void  ergodic()
{
    NSDictionary * dict3 ;
    dict3 = [NSDictionarydictionaryWithContentsOfFile:@"/Users/mac/desktop/a.txt"];
    //快速遍历
    for (id key in dict3) {
        NSLog(@"%@",[dict3objectForKey:key]);
    }
    //迭代器方法遍历
    NSEnumerator * keyEnum = [dict3keyEnumerator];
    id obj;
    while (obj = [keyEnumnextObject]) {
        NSLog(@"%@",obj);
    }
    NSEnumerator * valureEnum = [dict3objectEnumerator];
    id obj1;
    while (obj1 = [valureEnumnextObject]) {
        NSLog(@"%@",obj1);
    }
   
    //block方法遍历
    [dict3 enumerateKeysAndObjectsUsingBlock:^(id key, id obj,BOOL *stop) {
        NSLog(@"%@  %@",key,obj);
        NSString * keyJuge = key ;
        if ([keyJugecompare:@"key3"]==0) {
            *stop = YES ;
        }
    }];
   
}

void mutableDictionary()
{
    //动态创建
    NSMutableDictionary * dynamicDict;
    NSArray * valueArray = [NSArrayarrayWithObjects:@"Hello1",@"Hello2",@"Hello3",@"Hello4",nil];
    NSArray * keyArray = [NSArrayarrayWithObjects:@"1",@"2",@"3",@"4",nil];
    dynamicDict = [NSMutableDictionarydictionaryWithObjects:valueArrayforKeys:keyArray];
    NSLog(@"%@",dynamicDict);
   
    //替换元素元素
    [dynamicDict setObject:@"What"forKey:@"1"];
    //删除元素
    [dynamicDict removeObjectForKey:@"1"];

    NSLog(@"%@",dynamicDict);

}

int main(int argc, constchar * argv[]) {
    @autoreleasepool {
        // insert code here...
        NSLog(@"Hello, World!");
      //  staticCreatDictionary();
      //  others();
      //   keyAndValure();
       // ergodic();
        mutableDictionary();
    }
    return0;

}