先给你一个猝不及防的仰视

暂时蒙圈的我先上几个可用的code 但是具体区别 im not sure

第一段：Xcode自带 包含base64和gbk

        NSStringEncoding gbkEncoding1 =CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);

        NSString *result1 = [[NSString alloc] initWithData:responseObject  encoding:NSUTF8StringEncoding];

        NSData*decodedData = [[NSDataalloc]initWithBase64EncodedString:result1options:0];

        NSString*jsonstring = [[NSStringalloc]initWithData:decodedDataencoding:gbkEncoding1];

        NSData *jsondata = [jsonstring dataUsingEncoding:NSUTF8StringEncoding];

        NSMutableDictionary *dic = [NSJSONSerialization JSONObjectWithData:jsondata options:NSJSONReadingMutableContainers error:nil];

第二段：Xcode自带

        NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingMutableContainers error:nil];

第三段：SBJson

NSString *responseString = [NSString stringWithString:[string stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];

    NSDictionary*request_Json = [stringJSONValue];