状态管理-MultiProvider

🍎 多数据共享使用MultiProvider，在providers中定义所有的共享数据：

main() {
  runApp(MultiProvider(
    providers: providers,
    child: DBJMyApp(),
  ));
}

List<SingleChildWidget> providers = [
  ChangeNotifierProvider(create: (cxt) => DBJHomeViewModel(290)), //共享数据1
  ChangeNotifierProvider(
    create: (cxt) => DBJUserViewModel(
      DBJUserModel(nickName: 'jack', age: 12, sex: 'male'), //共享数据2
    ),
  ),
];

🍎 Widget中使用共享数据：

class DBJUserInfo extends StatelessWidget {
  const DBJUserInfo({Key? key}) : super(key: key);

  /// Consumer2获取共享数据
  @override
  Widget build(BuildContext context) {
    return Consumer2<DBJHomeViewModel, DBJUserViewModel>(
      builder: (cxt, homeViewModel, userViewModel, child) {
        String? nickName = userViewModel.model.nickName;
        String? sex = userViewModel.model.sex;
        int? age = userViewModel.model.age;
        return Column(
          children: [
            Text(
              '数量信息：${homeViewModel.counter}',
              style: TextStyle(fontSize: 15, color: Colors.red),
            ),
            Text(
              '用户信息：$nickName $sex $age',
              style: TextStyle(fontSize: 15, color: Colors.blue),
            ),
          ],
        );
      },
    );
  }
}