如何在 Flutter 中实现无限滚动：简单指南

import 'package:flutter/material.dart';
 
class InfiniteScrollListView extends StatefulWidget {
  @override
  _InfiniteScrollListViewState createState() => _InfiniteScrollListViewState();
}
 
class _InfiniteScrollListViewState extends State<InfiniteScrollListView> {
  final ScrollController _scrollController = ScrollController();
  final List<String> _items = List.generate(1000, (index) => 'Item $index');
  int _currentItemCount = 10;
 
  @override
  void initState() {
    super.initState();
    _scrollController.addListener(_scrollListener);
  }
 
  @override
  void dispose() {
    _scrollController.dispose();
    super.dispose();
  }
 
  void _scrollListener() {
    if (_scrollController.position.pixels == _scrollController.position.maxScrollExtent) {
      setState(() {
        _items.addAll(List.generate(_currentItemCount, (index) => 'Item ${_items.length + index}'));
        _currentItemCount *= 2;
      });
    }
  }
 
  @override
  Widget build(BuildContext context) {
    return ListView.builder(
      controller: _scrollController,
      itemCount: _items.length,
      itemBuilder: (context, index) {
        return ListTile(title: Text(_items[index]));
      },
    );
  }
}

这段代码演示了如何在Flutter中实现无限滚动ListView。通过监听滚动事件，当用户滚动到列表底部时，我们动态地增加列表项的数量，从而实现无限滚动的效果。这种方法适用于需要加载大量数据的场景，可以提高用户体验。