Symfony\Component\Console\Helper\ProgressBar::setEmptyBarCharacter PHP Method

    public function setEmptyBarCharacter($char)
    {
        $this->emptyBarChar = $char;
    }

 protected function execute(InputInterface $input, OutputInterface $output)
 {
     /** @var ImportAddressService $importAddressService */
     $importAddressService = $this->getHelper('container')->getByType('StreetApi\\Services\\ImportAddressService');
     $cityId = $input->getArgument('cityId');
     $xmlFile = simplexml_load_file($importAddressService->getRootDir() . '/../adresy.xml');
     if (!$xmlFile) {
         $output->writeln(PHP_EOL . '<error>Missing source file!</error>');
         return 1;
     }
     try {
         $output->writeLn('<info>Start importing addresses</info>');
         $totalCount = $xmlFile->count();
         $output->writeln(PHP_EOL . PHP_EOL . PHP_EOL . PHP_EOL);
         $progressBar = new ProgressBar($output, $totalCount);
         $progressBar->setFormat('%message%' . PHP_EOL . '%bar% %percent:3s% %' . PHP_EOL . 'count: %current%/%max%' . PHP_EOL . 'time:  %elapsed:6s%/%estimated:-6s%' . PHP_EOL);
         $progressBar->setBarCharacter('<info>■</info>');
         $progressBar->setEmptyBarCharacter(' ');
         $progressBar->setProgressCharacter('');
         $progressBar->setRedrawFrequency(ceil($totalCount / 100));
         $progressBar->start();
         $importAddressService->import($xmlFile, $progressBar, $cityId);
         $output->writeLn(PHP_EOL . '<info>Importing addresses finished</info>');
         return 0;
     } catch (\Exception $e) {
         $output->writeLn('<error>' . $e->getMessage() . '</error>');
         return 1;
     }
 }