1、写入（本地）

    NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

    NSString *path=[paths objectAtIndex:0];

    NSString *Json_path=[path stringByAppendingPathComponent:@"JsonFile.json"];

    //==写入文件

    NSLog(@"%@",[JsonData writeToFile:Json_path atomically:YES] ? @"Succeed":@"Failed");

 

2、读取

//==Json文件路径

    NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

    NSString *path=[paths objectAtIndex:0];

    NSString *Json_path=[path stringByAppendingPathComponent:@"JsonFile.json"];

    //==Json数据

    NSData *data=[NSData dataWithContentsOfFile:Json_path];

    //==JsonObject

    id JsonObject=[NSJSONSerialization JSONObjectWithData:data

                                                   options:NSJSONReadingAllowFragments

                                                     error:&error]

  //nslog (@"%@",jsonobject);打印json字典