ios gb2312转utf-8

靠，想写个爬虫功能，结果一直是乱码，终于找到了转码的方法了

+(NSString *) gb2312toutf8:(NSData *) data{

NSStringEncoding enc =CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);

NSString *retStr = [[NSString alloc] initWithData:data encoding:enc];

return retStr;

}