Flutter Go

https://github.com/alibaba/flutter-go

1_TextField(文本框)

main.dart

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      title: 'Retrieve Text Input',
      home:  MyForm(),
    );
  }
}


class MyForm extends StatefulWidget {
  const MyForm({Key? key}) : super(key: key);
  @override
  MyFormState createState() => MyFormState();
}

class MyFormState extends State<MyForm> {
  String results = "";

  final TextEditingController controller = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text("Using EditText"),
        backgroundColor: Colors.red,
      ),
      body:  Center(
          child: Column(
            children: <Widget>[
              TextField(
                decoration: const InputDecoration(hintText: "Enter text here..."),
                onSubmitted: (String str) {
                  setState(() {
                    results = results + "\n" + str;
                  });
                },
              ),
              Text(results)
            ],
          ),
        ),
    );
  }
}

1.1文本框获取值

main.dart

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      title: 'Retrieve Text Input',
      home: MyForm(),
    );
  }
}

// Define a Custom Form Widget
class MyForm extends StatefulWidget {
  const MyForm({Key? key}) : super(key: key);
  @override
  _MyFormState createState() => _MyFormState();
}

// Define a corresponding State class. This class will hold the data related to
// our Form.
class _MyFormState extends State<MyForm> {
  // Create a text controller. We will use it to retrieve the current value
  // of the TextField!
  final myController = TextEditingController();

  @override
  void dispose() {
    // Clean up the controller when the Widget is disposed
    myController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Retrieve Text Input'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: TextField(
          controller: myController,
        ),
      ),
      floatingActionButton: FloatingActionButton(
        // When the user presses the button, show an alert dialog with the
        // text the user has typed into our text field.
        onPressed: () {
           showDialog(
            context: context,
            builder: (context) {
              return AlertDialog(
                // Retrieve the text the user has typed in using our
                // TextEditingController
                content: Text(myController.text),
              );
            },
          );
        },
        tooltip: 'Show me the value!',
        child: const Icon(Icons.text_fields),
      ),
    );
  }
}

1.2_复制粘贴

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

void main() {
  runApp(const MyApp());
}

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

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

class HomePage extends StatefulWidget {
  const HomePage({Key? key}) : super(key: key);

  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  final TextEditingController _textController = TextEditingController();

  // This function is triggered when the copy icon is pressed
  Future<void> _copyToClipboard() async {
    await Clipboard.setData(ClipboardData(text: _textController.text));
    ScaffoldMessenger.of(context).showSnackBar(const SnackBar(
      content: Text('Copied to clipboard'),
    ));
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: const Text('Kindacode.com'),
          backgroundColor: Colors.deepOrange,
        ),
        body: Center(
            child: Padding(
          padding: const EdgeInsets.all(30),
          child: TextField(
            maxLines: null,//可以多行
            controller: _textController,
            decoration: InputDecoration(
              icon: IconButton(
                icon: const Icon(Icons.copy),
                onPressed: _copyToClipboard,
              ),
            ),
          ),
        )));
  }
}

2_TabBar(选项卡)

main.dart

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: DefaultTabController(
        length: 3,
        child: Scaffold(
          appBar: AppBar(
            title: const Material(
              color: Colors.blue,
        child: TabBar(
          tabs: [
            Tab(icon: Icon(Icons.directions_car)),
            Tab(icon: Icon(Icons.directions_transit)),
            Tab(icon: Icon(Icons.directions_bike)),
          ],
          ),
            ),
          ),
          
          body: const TabBarView(
            children: [
             Home1(),
             Home2(),
             Home3(),
            ],
          ),
        ),
      ),
    );
  }
}

class Home1 extends StatelessWidget{
  const Home1({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return const Scaffold(
      body: Center(child:Text('HOME1') ,),
    );
  }
}

class Home2 extends StatelessWidget{
  const Home2({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return const Scaffold(
      body: Center(child:Text('HOME2') ,),
    );
  }
}

class Home3 extends StatelessWidget{
  const Home3({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return const Scaffold(
      body: Center(child:Text('HOME3') ,),
    );
  }
}

3_bottomNavigationBar(底部导航栏)

main.dart

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}
class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        primaryColor: const Color(0xFF2196f3),
        canvasColor: const Color(0xFFfafafa), 
        colorScheme: ColorScheme.fromSwatch(primarySwatch: Colors.blue).copyWith(secondary: const Color(0xFF2196f3)),
      ),
      home: const MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key}) : super(key: key);
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int index=0;
  List<Widget>  pages=[
    const Home1(),
    const Home2(),
    const Home3(),
    const Home4()
  ];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      bottomNavigationBar: BottomNavigationBar(
          type: BottomNavigationBarType.fixed,
          currentIndex: index,
          fixedColor: Colors.blue,
          onTap: (int idx){
            setState(() {
              index=idx;
            });
          },
          items: const <BottomNavigationBarItem>[
            BottomNavigationBarItem(
              icon: Icon(Icons.access_alarm),
              label: 'Title',
            ),

            BottomNavigationBarItem(
              icon: Icon(Icons.star),
              label: 'Title',
            ),

            BottomNavigationBarItem(
              icon: Icon(Icons.pages),
              label: 'Title',
            ),

            BottomNavigationBarItem(
              icon: Icon(Icons.adjust),
              label: 'Title',
            ),
          ]
      ),
      body:pages[index] ,
    );
  }
}

class Home1 extends StatelessWidget{
  const Home1({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Home1'),),
      body: const Center(child:Text('HOME1') ,),
    );
  }
}

class Home2 extends StatelessWidget{
  const Home2({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Home2'),),
      body: const Center(child:Text('HOME2') ,),
    );
  }
}

class Home3 extends StatelessWidget{
  const Home3({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Home3'),),
      body: const Center(child:Text('HOME3') ,),
    );
  }
}

class Home4 extends StatelessWidget{
  const Home4({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Home4'),),
      body: const Center(child:Text('HOME4') ,),
    );
  }
}