void create()
{
/*字典：key ----> value索引 ----> 文字内容里面存储的东西都是键值对
*/// 字典创建方式// NSDictionary *dict = [NSDictionary dictionaryWithObject:@"jack" forKey:@"name"];// NSArray *keys = @[@"name", @"address"];// NSArray *objects = @[@"jack", @"北京"];// NSDictionary *dict = [NSDictionary dictionaryWithObjects:objects forKeys:keys];/*NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:@"jack", @"name",@"北京", @"address",@"32423434", @"qq", nil];
*/// 最实用的方法NSDictionary *dict = @{@"name" : @"jack", @"address" : @"北京"};// id obj = [dict objectForKey:@"name"];// 获取值id obj = dict[@"name"];NSLog(@"%@", obj);// 返回的是键值对的个数NSLog(@"%ld", dict.count);
}

void use1()
{NSMutableDictionary *dict = [NSMutableDictionary dictionary];// 添加键值对[dict setObject:@"jack" forKey:@"name"];[dict setObject:@"北京" forKey:@"address"];[dict setObject:@"rose" forKey:@"name"];// 移除键值对// [dict removeObjectForKey:<#(id)#>];
       NSString *str = dict[@"name"];//NSLog(@"%@", str);
    NSLog(@"%@", dict);//NSLog(@"%@", @[@"jack", @"rose"]);
}void use2()
{NSMutableDictionary *dict = @{@"name" : @"jack"};[dict setObject:@"rose" forKey:@"name"];
}void use3()
{// 字典不允许有相同的key，但允许有相同的value（Object）// 字典的无序的NSDictionary *dict = @{@"address" : @"北京",@"name" : @"jack",@"name2" : @"jack",@"name3" : @"jack",@"qq" : @"7657567765"};//    NSArray *keys = [dict allKeys];////    for (int i = 0; i<dict.count; i++)//    {//        NSString *key = keys[i];//        NSString *object = dict[key];//////        NSLog(@"%@ = %@", key, object);//    }// 使用Block来访问
    [dict enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {NSLog(@"%@ - %@", key, obj);// *stop = YES;
     }];
}

#import <Foundation/Foundation.h>int main()
{NSArray *persons = @[@{@"name" : @"jack", @"qq" : @"432423423", @"books": @[@"5分钟突破iOS编程", @"5分钟突破android编程"]},@{@"name" : @"rose", @"qq" : @"767567"},@{@"name" : @"jim", @"qq" : @"423423"},@{@"name" : @"jake", @"qq" : @"123123213"}];// NSDictionary *jim = persons[2];
    NSString *bookName = persons[0][@"books"][1];NSLog(@"%@", bookName);//NSArray *array = persons[0][@"books"];//NSLog(@"%@", array);// 先取出1位置对应的字典// 再取出字典中qq这个key对应的数据//NSLog(@"%@", persons[1][@"qq"]);// NSLog(@"%@", jim);return 0;
}