Flutter:使用共享首选项插件存储已保存的收藏列表

import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';

class MyFavoritesPage extends StatefulWidget {
  @override
  _MyFavoritesPageState createState() => _MyFavoritesPageState();
}

class _MyFavoritesPageState extends State<MyFavoritesPage> {
  List<String> favorites = [];

  @override
  void initState() {
    super.initState();
    loadFavorites();
  }

  Future<void> loadFavorites() async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    List<String> savedFavorites = prefs.getStringList('favorites') ?? [];
    setState(() {
      favorites = savedFavorites;
    });
  }

  Future<void> saveFavorites() async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    await prefs.setStringList('favorites', favorites);
  }

  void addToFavorites(String item) {
    setState(() {
      favorites.add(item);
    });
    saveFavorites();
  }

  void removeFromFavorites(String item) {
    setState(() {
      favorites.remove(item);
    });
    saveFavorites();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('My Favorites'),
      ),
      body: ListView.builder(
        itemCount: favorites.length,
        itemBuilder: (context, index) {
          return ListTile(
            title: Text(favorites[index]),
            trailing: IconButton(
              icon: Icon(Icons.delete),
              onPressed: () {
                removeFromFavorites(favorites[index]);
              },
            ),
          );
        },
      ),
      floatingActionButton: FloatingActionButton(
        child: Icon(Icons.add),
        onPressed: () {
          addToFavorites('New Item');
        },
      ),
    );
  }
}