选择风格关闭

import 'package:flutter/material.dart';

// void main() {
//   runApp(
//       MaterialApp(
//           debugShowCheckedModeBanner: false,
//           home: Scaffold(
//               appBar: AppBar(
//                   title: Text("第一个Flutter程序")
//               ),
//               body: Center(
//                 child: Text(
//                   "Hello World",
//                   style: TextStyle(
//                     fontSize: 40,
//                     color: Colors.blue,
//                   ),
//                 ),
//               )
//           )
//       )
//   );
// }



///简化写法 void main() => runApp(const MyApp());
void main() {
  runApp(const MyApp());
}

/// App根Widget
class MyApp extends StatelessWidget{
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      debugShowCheckedModeBanner: false,
      home: HomePage(),
    );
  }
}

/// 页面Widget
class HomePage extends StatelessWidget{
  const HomePage({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        centerTitle: true,
        backgroundColor: Colors.grey,

        title: Text(
          "第一个Flutter程序"
        ),
      ),
      body: const Center(
        child: Text(
          "Hello World",
          style: TextStyle(
            fontSize: 38,
            color: Colors.blue,
          ),
        ),
      ),
    );
  }
}