因为有些效果需要用到全屏的camera，但是camera会遮住按钮，所以把按钮放在cover-view中，模拟器上能显示按钮，但是无法触发

onShareAppMessage事件。cover-view没法设置open-type="share"，

<camera device-position="back"  flash="off" binderror="error" style="width: 100%; height: {{height}}px">

<cover-view wx-if='{{show}}' class="controls">

<cover-view class="play">

<cover-image class="img" src="../../image/xian.jpg" />

<cover-view open-type='share'>分享</cover-view>

<!-- <button open-type='share'>分享</button> -->

</cover-view>

</cover-view>

</camera>

求大神帮忙解答