Flutter ListView 构建器滚动 Controller 监听器未在 ListView 内触发？

Question

我在另一个 ListView 中有一个 ListView 构建器小部件。当滚动位置到达其末尾时，内部 ListView 监听器不会触发。

initState() {
   super.initState();

  _scrollController.addListener(() {
  if (_scrollController.position.maxScrollExtent ==
      _scrollController.position.pixels) {function();}
}

Container(
 child: Listview(
  children: <Widget>[
    Container(),
    ListView.builder(
      controller: _scrollController,
      physics: NeverScrollableScrollPhysics(),
      shrinkWrap: true,
      itemCount: list.length,
      itemBuilder: (BuildContext context, int index) {
         return Container();
      },
   ),
  ]
 )
)

Answer 1

ListView 必须滚动，否则将无法工作。您不仅必须删除 NeverScrollableScrollPhysics()，还要将该 ListView 添加到某个容器中，并将其高度设置为小于 ListView 的整体高度。然后listView开始滚动，函数就会被触发

  ScrollController _scrollController = ScrollController();
  List<int> list = [1, 2, 3, 4, 5];
  initState() {
    super.initState();

    _scrollController.addListener(() {
      if (_scrollController.position.maxScrollExtent ==
          _scrollController.position.pixels) {
        print('firing');
      }
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: ControlBar(
          title: Text('Home'),
        ),
      ),
      body: ListView(
        children: <Widget>[
          Container(
            height: 150,
            child: ListView.builder(
              controller: _scrollController,
              shrinkWrap: true,
              itemCount: list.length,
              itemBuilder: (BuildContext context, int index) {
                return ListTile(title: Text(list[index].toString()));
              },
            ),
          ),
        ],
      ),
    );
  }