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;

}