如何在flutter中聚焦listView的最后一项

SingleChildScrollView(
  child: ListView.builder(
    itemCount: itemCount, // 列表项的总数
    itemBuilder: (BuildContext context, int index) {
      return ListTile(
        title: Text('Item $index'),
      );
    },
  ),
)

ScrollController _scrollController = ScrollController();

@override
void initState() {
  super.initState();
  _scrollController.addListener(_scrollListener);
}

@override
void dispose() {
  _scrollController.dispose();
  super.dispose();
}

void _scrollListener() {
  if (_scrollController.offset >=
      _scrollController.position.maxScrollExtent &&
      !_scrollController.position.outOfRange) {
    // 已滚动到底部
  }
}

SingleChildScrollView(
  controller: _scrollController,
  child: ListView.builder(
    ...
  ),
)

void _scrollListener() {
  if (_scrollController.offset >=
      _scrollController.position.maxScrollExtent &&
      !_scrollController.position.outOfRange) {
    // 已滚动到底部
    _scrollController.animateTo(
      _scrollController.position.maxScrollExtent,
      duration: Duration(milliseconds: 300),
      curve: Curves.easeOut,
    );
  }
}