如何设置StateNotifierProvider的状态

import 'package:flutter_riverpod/flutter_riverpod.dart';

// 创建状态管理类
class CounterState extends StateNotifier<int> {
  CounterState() : super(0);

  void increment() {
    state++;
  }
}

void main() {
  // 创建提供器
  final counterProvider = StateNotifierProvider((ref) => CounterState());

  runApp(
    ProviderScope(
      child: MyApp(),
    ),
  );
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('StateNotifierProvider Example'),
        ),
        body: Center(
          child: Consumer(
            builder: (context, watch, _) {
              final counter = watch(counterProvider);

              return Text(
                'Count: ${counter.state}',
                style: TextStyle(fontSize: 24),
              );
            },
          ),
        ),
        floatingActionButton: FloatingActionButton(
          onPressed: () {
            // 更新状态
            context.read(counterProvider).increment();
          },
          child: Icon(Icons.add),
        ),
      ),
    );
  }
}