Flutter如何在streambuilder中每隔N次向列表视图添加一项

StreamController<int> _streamController = StreamController<int>();

int count = 0;
Timer.periodic(Duration(seconds: 1), (timer) {
  count++;
  if (count % N == 0) {
    _streamController.add(count);
  }
});

StreamBuilder<int>(
  stream: _streamController.stream,
  builder: (BuildContext context, AsyncSnapshot<int> snapshot) {
    if (snapshot.hasData) {
      // 获取Stream中的数据
      int data = snapshot.data;
      // 将数据添加到列表视图中
      return ListView.builder(
        itemCount: data,
        itemBuilder: (BuildContext context, int index) {
          return ListTile(
            title: Text('Item $index'),
          );
        },
      );
    } else {
      return CircularProgressIndicator();
    }
  },
)