NSDictionary用法

介绍的api

 

// //  main.m //  NSDiconary // //  Created by ganchaobo on 13-4-29. //  Copyright (c) 2013年 ganchaobo. All rights reserved. //   #import <Foundation/Foundation.h> void   CreateDic(){      //第一种创建字典,创建多个key-value      NSDictionary  *dic=[ NSDictionary  dictionaryWithObjectsAndKeys:@ "k1" ,@ "v1"                         ,@ "k2" ,@ "v2" ,@ "k3" ,@ "v3" , nil ];      //NSLog(@"%@",dic);      //第二种创建字典 创建一对 key-value      NSDictionary  *dic1=[ NSDictionary  dictionaryWithObject:@ "VV"  forKey:@ "KK" ];    //  NSLog(@"%@",dic1);      //第三种创建多对间值      NSArray  *key=[ NSArray  arrayWithObjects:@ "K1" ,@ "K2" ,@ "K3" , nil ];      NSArray  *value=[ NSArray  arrayWithObjects:@ "V1" ,@ "V2" ,@ "V3" , nil ];      NSDictionary  *dic2=[ NSDictionary  dictionaryWithObjects:key forKeys:value];            //NSLog(@"%@",dic2);      NSDictionary  *dic3=[ NSDictionary  dictionaryWithDictionary:dic2];      NSLog (@ "%@" ,dic3); }   void  DicMethod(){      NSDictionary  *dic=[ NSDictionary  dictionaryWithObjectsAndKeys:@ "K1" ,@ "V1" ,@ "K2" ,@ "V2" ,@ "K3" ,@ "V3" , nil ];       NSDictionary  *dic1=[ NSDictionary  dictionaryWithObjectsAndKeys:@ "K1" ,@ "V1" ,@ "K1" ,@ "V2" ,@ "K3" ,@ "V3" , nil ];      NSLog (@ "%zi" ,[dic count]); //字典种右多少对key-value      NSLog (@ "%@" ,[dic allKeys]); //字典种的所有keys      NSLog (@ "%@" ,[dic allValues]); //字典中所有的values      NSLog (@ "%i" ,[dic isEqualToDictionary:dic1]);      NSLog (@ "%@" ,[dic objectForKey:@ "V1" ]);      NSArray  *arr=[dic1 allKeysForObject:@ "K1" ]; //通过value找对应多个key            NSArray  *arr1=[ NSArray  arrayWithObjects:@ "V1" ,@ "V2" ,@ "VG" , nil ];      NSArray  *ARR= [dic objectsForKeys:arr1 notFoundMarker:@ "BB" ];      NSLog (@ "%@" ,ARR);             }   void  WriteFile(){              NSDictionary  *dic=[ NSDictionary  dictionaryWithObjectsAndKeys:@ "k1" ,@ "v1" ,@ "k2" ,@ "v2" , nil ];      [dic writeToFile:@ "/Users/ganchaobo/Desktop/2.txt"  atomically: YES ];       } void  ReadFile(){      NSDictionary  *dic=[ NSDictionary  dictionaryWithContentsOfFile:@ "/Users/ganchaobo/Desktop/2.txt" ];      NSLog (@ "%@" ,dic); }     //第一次遍历 void  bianli1(){      NSDictionary  *dic=[ NSDictionary  dictionaryWithObjectsAndKeys:@ "k1" ,@ "v1" ,@ "k2" ,@ "v2" , nil ];      NSArray  *arr=[dic allKeys];      for ( id  key in arr){          id  obj=[dic objectForKey:key];          NSLog (@ "Key-->%@  value--->%@" ,key,obj);      } } //第二种遍历 void  bianli2(){         NSDictionary  *dic=[ NSDictionary  dictionaryWithObjectsAndKeys:@ "k1" ,@ "v1" ,@ "k2" ,@ "v2" , nil ];      NSEnumerator  *e=  [dic keyEnumerator];      id  key= nil ;      while (key=[e nextObject]){          id  obj=[dic objectForKey:key];      NSLog (@ "Key-->%@  value--->%@" ,key,obj);      } }   //第三种遍历 void  bianli3(){      NSDictionary  *dic=[ NSDictionary  dictionaryWithObjectsAndKeys:@ "k1" ,@ "v1" ,@ "k2" ,@ "v2" , nil ];      [dic enumerateKeysAndObjectsUsingBlock:^( id  key, id  value, BOOL  *stop){       NSLog (@ "Key-->%@  value--->%@" ,key,value);      }]; } /////////key排序 void  sort1(){      NSDictionary  *dic=[ NSDictionary  dictionaryWithObjectsAndKeys:@ "1" ,@ "AC" ,@ "3" ,@ "AF" ,@ "2" ,@ "AE" , nil ];     NSArray  *arr= [dic keysSortedByValueUsingSelector: @selector (compare:)];      //通过value排序，返回key集合      NSLog (@ "%@" ,arr); }   void  sort2(){            NSDictionary  *dic=[ NSDictionary  dictionaryWithObjectsAndKeys:@ "1" ,@ "AC" ,@ "3" ,@ "AF" ,@ "2" ,@ "AE" , nil ];      NSLog (@ "%@" ,dic); } //NSMustableDictionary void  CreateMutableDic(){        NSMutableDictionary  *mutableArray=[ NSMutableDictionary  dictionaryWithObjectsAndKeys:@ "V1" ,@ "K1" ,@ "V2" ,@ "K2" , nil ];      NSMutableDictionary  *dic=[ NSMutableDictionary  dictionaryWithObject:@ "AA"  forKey:@ "BB" ];      //[mutableArray addEntriesFromDictionary:dic];//在字典种添加字典      //[mutableArray removeAllObjects];      //[mutableArray removeObjectForKey:@"K1"];//通过key移除键值对      //[mutableArray setDictionary:dic];//重新设置字典      //[mutableArray setObject:@"VV" forKey:@"K1"];//通过字典的key设置value      //[mutableArray setObject:[NSNull null] forKey:@"K1"];//通过key 设置value 为null      NSArray  *arr=[ NSArray  arrayWithObjects:@ "K1" ,@ "K3"  , nil ];      [mutableArray removeObjectsForKeys:arr]; //删除数组中相同的key对应的key－value      NSLog (@ "%@" ,mutableArray); }   int  main( int  argc, const  char  * argv[]) {        @autoreleasepool  {                    CreateMutableDic();                }      return  0; }