IOS请求网络返回JSON解析

-(NSDictionary*)Login:(NSString *)email password:(NSString *)password
  {
  NSMutableDictionary *resultsDictionary;// 返回的 JSON 数据
  NSDictionary *userDictionary = [[NSDictionary alloc] initWithObjectsAndKeys:password, @"password",email,@"email",nil];
  if ([NSJSONSerialization isValidJSONObject:userDictionary])
  {

    NSError *error;

    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:userDictionary options:NSJSONWritingPrettyPrinted error: &error];
    NSMutableData *tempJsonData = [NSMutableData dataWithData:jsonData];
    NSURL *url = [NSURL URLWithString:@"http://seanchense.com/login"];

    ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
    [request addRequestHeader:@"Content-Type" value:@"application/json; charset=utf-8"];
    [request addRequestHeader:@"Accept" value:@"application/json"];

    [request setRequestMethod:@"POST"];
    [request setPostBody:tempJsonData];
    [request startSynchronous];
    NSError *error1 = [request error];
    if (!error1)
    {
        NSString *response = [request responseString];
        NSLog(@"Test：%@",response);
        NSData* jsonData = [response dataUsingEncoding:NSUTF8StringEncoding];

    }
  }

  return resultsDictionary;
  }

　//实例化一个书本管理类

        Book_manager *bm = [Book_manager new];

        //读入文件

        NSString *content = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];

        //NSLog(@"%@",content);   //这句话可以用来测试是否读取到数据

        //转换成二进制数据

        NSData * data = [content dataUsingEncoding:NSUTF8StringEncoding];

        //解析JSON文件 OC中自带的方法

        NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];

        //过滤节点，如果是｛｝就是词典，如果是[]就是数组，层层过滤

        dict = [dict objectForKey:@"root"];

        dict = [dict objectForKey:@"books"];

        NSArray * arr = [dict objectForKey:@"book"];

        //遍历数组并添加进书本管理

        for (NSDictionary * dd in arr) {

　　　　//实例化一本书

            BOOK *book = [BOOK new];

            book.Id = [dd objectForKey:@"-id"];

            book.language = [dd objectForKey:@"-language"];

            book.name = [dd objectForKey:@"name"];

            book.price = [[dd objectForKey:@"price"] doubleValue];

            book.auther_name = [[dd objectForKey:@"auther"] objectForKey:@"name"];

            book.summary = [dd objectForKey:@"summary"];

　　　　//添加书本进管理类中

            [bm addBOOK:book];

        }

参考：https://segmentfault.com/a/1190000000519598，https://www.cnblogs.com/dengsir/articles/5162216.html