iOS开发-- TFHpple抓取GB-2312编码的html页面，页面返回编码错误

 1 // 1. 获取Data
 2     NSURL *postDetailUrl = [NSURL URLWithString:[NSString stringWithFormat:@"%@%@", BASEURL, self.topicUrl]];
 3     NSData *postDetailHtmlData = [NSData dataWithContentsOfURL:postDetailUrl];
 4     
 5     // 2. 转码成utf8Data:先转成gb2312, 替换meta, 然后转成utf8
 6     NSStringEncoding gbkEncoding = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
 7     NSString *postHtmlStr = [[NSString alloc] initWithData:postDetailHtmlData encoding:gbkEncoding];
 8 
 9     NSString *uft8HtmlStr = [postHtmlStr stringByReplacingOccurrencesOfString:@"<meta HTTP-EQUIV=\"Content-Type\" CONTENT=\"text/html; charset=gb2312\">" withString:@"<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\">"];
10     NSData *utf8HtmlData = [uft8HtmlStr dataUsingEncoding:NSUTF8StringEncoding];