GridView.php

<?php
class GridView extends \kartik\grid\GridView {

    const TYPE_NONE = 'none';

    public $toolbar = [];
    public $bordered = false;
    public $export = false;
    public $layout = "{items}\n{pager}\n{pageSize}\n{summary}";
    public $summaryOptions = [
        'class' => 'pull-right'
    ];
    public $panel = [
        'heading' => false
    ];
    public $filterSelector = 'select[name="per-page"]';
    public $panelFooterTemplate = <<< HTML
    <div class="kv-panel-pager">
        {pager}
        <div class="page-info">
            {pageSize}
            {summary}
        </div>
        <div class="clearfix"></div>
    </div>
    {footer}
    <div class="clearfix"></div>
HTML;

    public function renderSection($name) {
        switch ($name) {
            case "{pageSize}":
                return $this->renderPageSize();
            default:
                return parent::renderSection($name);
        }
    }

    public function renderPageSize() {
        $pagination = $this->dataProvider->getPagination();
        return $pagination !== false ? Html::tag('div', PageSize::widget([
            'defaultPageSize' => $pagination->getPageSize()
        ]), ['class' => 'per-page pull-right']) : null;
    }
}

PageSize.php

<?php
/**
 * PageSize widget is an addition to the \yii\grid\GridView that enables
 * changing the size of a page on GridView.
 *
 * To use this widget with a GridView, add this widget to the page:
 *
 * ~~~
 * <?php echo \nterms\PageSize::widget(); ?>
 * ~~~
 *
 * and set the `filterSelector` property of GridView as shown in
 * following example.
 *
 * ~~~
 * <?= GridView::widget([
 *      'dataProvider' => $dataProvider,
 *      'filterModel' => $searchModel,
 * 		'filterSelector' => 'select[name="per-page"]',
 *      'columns' => [
 *          ...
 *      ],
 *  ]); ?>
 * ~~~
 *
 * Please note that `per-page` here is the string you use for `pageSizeParam` setting of the PageSize widget.
 *
 * @author Saranga Abeykoon <[email protected]>
 * @since 1.0
 */
class PageSize extends \yii\base\Widget
{
    /**
     * @var integer the defualt page size. This page size will be used when the $_GET['per-page'] is empty.
     */
    public $defaultPageSize = 20;

    /**
     * @var string the name of the GET request parameter used to specify the size of the page.
     * This will be used as the input name of the dropdown list with page size options.
     */
    public $pageSizeParam = 'per-page';

    /**
     * @var array the list of page sizes
     */
    public $sizes = [10 => 10, 20 => 20, 50 => 50, 100 => 100, 200 => 200];

    /**
     * @var array the list of options for the drop down list.
     */
    public $options;

    /**
     * Runs the widget and render the output
     */
    public function run()
    {
        if(empty($this->options['id'])) {
            $this->options['id'] = $this->id;
        }


        $perPage = !empty($_GET[$this->pageSizeParam]) ? $_GET[$this->pageSizeParam] : $this->defaultPageSize;

        $listHtml = Html::dropDownList($this->pageSizeParam, $perPage, $this->sizes, $this->options);

        $output = Yii::t('app', '每页 {listHtml} 则记录', ['listHtml' => $listHtml]);

        return $output;
    }
}