内层 listview 无法使用 controller

[Shu-Ji]

SmartRefresher(
  controller: _refresh_controller,
  child: ListView.builder(
    controller: _list_controller

    ... // 在某个点击事件中使用 list controller 会报错
    onTap: () {
        print(_list_controller);
        _list_controller.animateTo(.0, Duration(seconds: 1), Curves.ease);
    }
  )
)

print 语句打印结果为：

ScrollController#4e01c(no clients)

如果去掉 SmartRefresher，打印结果类似为：

ScrollController#4e01c(one client, offset 3.3)

�报错信息：

I/flutter ( 7395): ══╡ EXCEPTION CAUGHT BY GESTURE ╞══
I/flutter ( 7395): The following assertion was thrown while handling a gesture:
I/flutter ( 7395): ScrollController not attached to any scroll views.
I/flutter ( 7395): 'package:flutter/src/widgets/scroll_controller.dart': Failed assertion: line 149 pos 12:
I/flutter ( 7395): '_positions.isNotEmpty'

[Shu-Ji]

解决了。
通过查看源码，不需要自己定义 controller：

    onTap: () {
        _refresh_controller.scrollController.animateTo(.0, Duration(seconds: 1), Curves.ease);
    }