protected function renderLoading()
{
$options = $this->options;
$label = ArrayHelper::getValue($this, 'label', '数据加载中');
Html::addCssClass($options, ['weui_loading_toast']);
Html::addCssStyle($options, ['display' => 'none']);
$content = <<<EOF
<div class="weui_mask_transparent"></div>
<div class="weui_toast">
<div class="weui_loading">
<div class="weui_loading_leaf weui_loading_leaf_0"></div>
<div class="weui_loading_leaf weui_loading_leaf_1"></div>
<div class="weui_loading_leaf weui_loading_leaf_2"></div>
<div class="weui_loading_leaf weui_loading_leaf_3"></div>
<div class="weui_loading_leaf weui_loading_leaf_4"></div>
<div class="weui_loading_leaf weui_loading_leaf_5"></div>
<div class="weui_loading_leaf weui_loading_leaf_6"></div>
<div class="weui_loading_leaf weui_loading_leaf_7"></div>
<div class="weui_loading_leaf weui_loading_leaf_8"></div>
<div class="weui_loading_leaf weui_loading_leaf_9"></div>
<div class="weui_loading_leaf weui_loading_leaf_10"></div>
<div class="weui_loading_leaf weui_loading_leaf_11"></div>
</div>
<p class="weui_toast_content">{$label}</p>
</div>
EOF;
return Html::tag('div', $content, $options);
}
