ios中将单个字典转换成json格式以及json格式的转换成字典解析

    //1.这段代码是将字典封装数据。

    NSMutableDictionary *dict  = [[NSMutableDictionary alloc]init];    [dict setValue:@"谢飞" forKey:@"name"];    [dict setValue:@"[email protected]" forKey:@"email"];    [dict setValue:@"ios工程师" forKey:@"profession"];    //2.字典序列化，变成json字符串    NSData *dictData = [NSJSONSerialization dataWithJSONObject:dict options:NSJSONWritingPrettyPrinted error:nil];    NSString *jsonString = [[NSString alloc]initWithData:dictData encoding:NSUTF8StringEncoding];        NSMutableDic