os dispatch data

afnetworking返回数据的是os dispatch data 没办法进行解析

转换方法  ：

 NSString*receiveStr = [[NSStringalloc]initWithData:responseObjectencoding:NSUTF8StringEncoding];

NSData* data = [receiveStrdataUsingEncoding:NSUTF8StringEncoding];

指定转换成的类型 这里看作字典 可以拿来解析了

NSDictionary*jsonDict = [NSJSONSerializationJSONObjectWithData:dataoptions:NSJSONReadingMutableLeaveserror:nil];

通用方法 ：用于将服务器返回的responseObject  转成可解析的json

1.

NSError*error;

NSData*jsonData = [NSJSONSerializationdataWithJSONObject:respondObjectoptions:NSJSONWritingPrettyPrintederror:&error];

id json = [NSJSONSerializationJSONObjectWithData:jsonDataoptions:NSJSONReadingMutableLeaveserror:nil];

return json;

2.

NSString *receiveStr = [[NSString alloc] initWithData:respondObject encoding:NSUTF8StringEncoding];

 NSData * mm = [receiveStr dataUsingEncoding:NSUTF8StringEncoding];

 id json = [NSJSONSerialization JSONObjectWithData:mm options:NSJSONReadingMutableLeaves error:nil];

 returnjson;