IPhone xml 文件GBK 转 UTF8

iphone不支持GBK,需要转化,方法如下:

-(NSData *) toUtf8:(NSData *)inData {
    CFStringRef gbkStr = CFStringCreateWithBytes(NULL, [inData bytes], [inData length], kCFStringEncodingGB_18030_2000, false);

    if (NULL == gbkStr) {
        return nil;
    } else {
        NSString *gbkStrTmp = (NSString *)gbkStr;
        NSString *utf8NSString = [gbkStrTmp stringByReplacingOccurrencesOfString:@"l version=/"1.0/" encoding=/"gbk/""
                                                                      withString:@"l version=/"1.0/" encoding=/"UTF-8/""];

        return [utf8NSString dataUsingEncoding:NSUTF8StringEncoding];
    }
}