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                ## 命令行:命令行進度條 對于耗時任務,有進度條提示,用戶體驗會好很多。 下面,我們創建一個演示進度條基本用法的`demo:processbar`命令,源碼如下: ~~~php Artisan::command('demo:processbar {--custom}', function ($custom) { $bar = $this->output->createProgressBar(10); if ($custom) { $bar->setBarCharacter('<comment>=</comment>'); $bar->setEmptyBarCharacter(' '); $bar->setProgressCharacter('|'); $bar->setBarWidth(50); } $i = 0; do { sleep(1); $bar->advance(); } while (++$i < 10); $bar->finish(); }); ~~~ 首先,我們用`output`對象創建一個進度條對象,創建的同時指定進度條的總步長。 ~~~php $bar = $this->output->createProgressBar(10); ~~~ 然后,可以對進度條進行定制,比如上面的命令在指定`--custom`選項后,會進行下列定制: 設置進度條已完成部分的字符(黃色`=`號): ~~~php $bar->setBarCharacter('<comment>=</comment>'); ~~~ 設置進度條未完成部分字符(空格字符): ~~~php $bar->setEmptyBarCharacter(' '); ~~~ 設置進度指示字符: ~~~php $bar->setProgressCharacter('|'); ~~~ 設置進度條寬度: ~~~php $bar->setBarWidth(50); ~~~ 更多定制項,請見[Symfony 進度條組件文檔](https://symfony.com/doc/current/components/console/helpers/progressbar.html)。 然后,在命令執行過程中,更新進度條進度: ~~~php $bar->advance(); ~~~ 最后,任務執行完畢后,設置進度條完結。 ~~~php $bar->finish(); ~~~ 效果: [![命令行進度條](https://cdn.learnku.com/uploads/images/201905/27/7636/9GAW6R96Uj.gif!large)
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