scroll-view 组件  在ios机型下， 频繁多次的操作下拉刷新 内容无法复位；微信版本号：8.0.49；  基础库：3.4以上都试过； 

<scroll-view 
class="scrollarea" 
scroll-y 
type="list"
refresher-enabled="{{true}}"
refresher-background="red"
refresher-triggered="{{isRefresher}}"
bindrefresherrefresh="onRefresh"
>
  <view class="container">
    <view class="userinfo">
      XXXX
    </view>
    <view class="usermotto">
      <text class="user-motto">{{motto}}</text>
    </view>
  </view>
</scroll-view>

js:
  onRefresh(event){
    this.setData({
      isRefresher:true
    })
    setTimeout(()=>{
      this.setData({
        isRefresher:false
      })
    }, 500)
  },