import 'package:flutter/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',
      home: Scaffold(
        body: Center(
         child: TextField()
        ), // This trailing comma makes auto-formatting nicer for build methods.
      ),
    );
  }
}

 flutter doctor -v
[✓] Flutter (Channel stable, 1.22.3, on Mac OS X 10.15.5 19F101, locale zh-Hans-CN)
    • Flutter version 1.22.3 at /Users/xx/Documents/software/flutter
    • Framework revision 8874f21e79 (12 days ago), 2020-10-29 14:14:35 -0700
    • Engine revision a1440ca392
    • Dart version 2.10.3

 
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.1)
    • Android SDK at /Users/xx/Library/Android/sdk
    • Platform android-30, build-tools 30.0.1
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 12.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 12.1, Build version 12A7403
    • CocoaPods version 1.9.3

[✓] Android Studio (version 4.0)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 46.0.2
    • Dart plugin version 193.7361
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)

[✓] IntelliJ IDEA Ultimate Edition (version 2020.1.2)
    • IntelliJ at /Applications/IntelliJ IDEA.app
    • Flutter plugin version 48.0.3
    • Dart plugin version 201.7846.93

[✓] VS Code (version 1.51.0)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.16.0

[✓] Connected device (2 available)
    • iPhone (mobile)   • 00008020-000954E136A1002E            • ios • iOS 14.1
    • iPhone 8 (mobile) • 8615018E-67C8-4583-BDCE-1F63662BB008 • ios •
      com.apple.CoreSimulator.SimRuntime.iOS-14-1 (simulator)