<view class="van-picker">
  <view class="van-picker__toolbar van-hairline--bottom">
    <view class="van-picker__cancel" bindtap="onCancel">取消</view>
    <view class="van-picker__title">{{ title }}</view>
    <view class="van-picker__confirm" bindtap="onConfirm">确定</view>
  </view>

  <view wx:if="{{ loading }}" class="van-picker__loading">
    <van-loading color="#38f"/>
  </view>

  <picker-view
    indicator-style="height: {{ itemHeight }}px;"
    style="width: 100%; height: {{ itemHeight * visibleItemCount + 'px' }}"
    bindchange="onChange"
    value="{{ pickerValue }}"
    class="van-picker__columns"
  >
    <picker-view-column
      wx:for="{{ displayColumns }}"
      wx:for-item="row"
      wx:for-index="rowIndex"
      wx:key="rowIndex"
      class="van-picker-column"
    >
      <view
        wx:for="{{ row }}"
        wx:key="{{ item.code }}"
        style="line-height: {{ itemHeight }}px;"
        class="van-picker-column__item {{ index === pickerValue[rowIndex] ? 'van-picker-column__item--selected' : '' }}"
      >{{ item.name }}</view>
    </picker-view-column>
  </picker-view>
</view>