flutter - 使用flutter Provider小部件时出现以下错误

Question

    The argument type 'Widget Function(BuildContext)' can't be assigned to the parameter type 'Widget 
     Function(BuildContext, Widget)'.

我在flutter中使用提供程序小部件时收到以下错误

    import 'package:todoey_flutter/Screens/tasks_screens.dart';
    import 'package:todoey_flutter/models/task_data.dart';

      void main() {
          runApp(MyApp());
       }
  class MyApp extends StatelessWidget {
     @override
    Widget build(BuildContext context) {
return ChangeNotifierProvider(
  builder: (context)=> TaskData(),
  child: MaterialApp(
    home:TasksScreen(),
  ),
);
 }
  }

以下是包含此TaskData类的文件中的代码

  import 'package:flutter/cupertino.dart';
  import 'package:flutter/material.dart';
  import 'task.dart';
  class TaskData extends ChangeNotifier{
     List<Task> tasks =[
       Task(name: 'buy milk'),
       Task(name:'buy eggs'),
       Task(name: 'buy bread'),

                        ];
                        }

Answer 1

https://pub.dev/packages/provider#migration-from-v3x0-to-v400
经典builder的providers应该替换为create。
您可以将builder更改为create

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return ChangeNotifierProvider(
      create: (context) => TaskData(),
      child: MaterialApp(
        home: TasksScreen(),
      ),
    );
  }
}