SmartRefresher 下拉刷新和上拉加载更多

想在ListView外面使用SmartRefresher进行下拉树新和上拉加载更多时，一定要是把ListView直接放在SmartRefresher的child中，否则会无法触发

return prefix0.SmartRefresher(

footer: prefix0.CustomFooter(

builder: (BuildContext context, prefix0.LoadStatus mode) {

Widget body;

      if (mode == prefix0.LoadStatus.loading) {

body =Text("正在加载...");

      }else {

body =Text("没有更多数据了");

      }

return Container(

height:55.0,

        child:Center(child: body),

      );

    },

  ),

  controller:_refresh,

  enablePullDown:false,

  enablePullUp:true,

  onLoading: ()async {

//加载更多

  },

  child:ListView.builder(

controller:_controller,

    itemCount:_messages.length,

    shrinkWrap:true,

    reverse:true,

    itemBuilder: (BuildContext context, int index) {

return _messageContainer(_messages[index]);

    },

  ),

);