用 vscode 创建第一个 flutter 项目

| 2021-11-17

大家好，我是坚果，我的公众号“坚果前端”，

今天教大家

用 vscode 创建第一个项目

创建新项目

在安装了 Flutter 扩展的 VS Code 中，通过选择 View ▸ Command Palette…或在 macOS 上按 Command-Shift-P 或在 Linux 或 Windows 上按 Control-Shift-P 打开命令面板。在面板中输入 Flutter: New 并按 Return。

默认第一个。直接按 return

这个时候选择一个文件夹创建。

然后返回这个界面。给自己的项目命名。

这个就是创建后的项目结构

启动调试

运行-启动调试

我没有连真机，所以显示的是我安装的浏览器

然后直接运行，VSCode 只需要按 F5 快捷键就行了。

然后你就可以看到 VSCode 弹出一个框让你选择运行项目的环境：

老铁，听我说，选 “ Dart & Flutter ” 就对了。

然后稍等一下吧，项目会编译，然后自动生成内容，其实就是 Dart 转换成 JavaScript 的过程。

Dart 原本就是（谷歌）想代替 JavaScript 而发明的，可以转换成 JavaScript 代码。

感觉 Dart 走了曲线救国的方式，终于走到这步 —— 代替 JavaScript。

最后，你会看到你系统默认的浏览器会弹出一个新的窗口来运行你的项目。（感觉刚开始有点慢吧。。。。）

下面我们来看看项目的目录：

web/index.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title></title>
  <script defer src="main.dart.js" type="application/javascript"></script>
</head>
<body>
</body>
</html>

web/main.dart

// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:flutter_web_ui/ui.dart' as ui;
import 'package:aaaaaaa/main.dart' as app;


main() async {
  await ui.webOnlyInitializePlatform();
  app.main();
}

lib/main.dart

import 'package:flutter_web/material.dart';


void main() => runApp(MyApp());


class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}


class MyHomePage extends StatelessWidget {
  MyHomePage({Key key, this.title}) : super(key: key);


  final String title;


  @override
  Widget build(BuildContext context) {
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        title: Text(title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          // Column is also layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          //
          // Invoke "debug painting" (choose the "Toggle Debug Paint" action
          // from the Flutter Inspector in Android Studio, or the "Toggle Debug
          // Paint" command in Visual Studio Code) to see the wireframe for each
          // widget.
          //
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'Hello, World!',
            ),
          ],
        ),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

本文就大致介绍到这里吧，不管怎么说 Flutter 跑在 Web 上面而且不是试验性质的，是正式版的，这是令人多么激动无比啊，我也情不自禁为其写下一篇相关文章。

本文文字及图片出自 InfoQ