1_Switch(开关)

import 'package:flutter/material.dart';void main() => runApp(SnackBarDemo());class SnackBarDemo extends StatelessWidget {  @override  Widget build(BuildContext context) {    return MaterialApp(      home: Scaffold(        appBar: AppBar(          title: Text('SnackBar Demo'),        ),        body: SnackBarPage(),      ),    );  }}class SnackBarPage extends StatefulWidget {  @override  _SnackBarPageState createState() => _SnackBarPageState();}class _SnackBarPageState extends State
    
      { bool _value=false;  @override  Widget build(BuildContext context) {         return Container(      child: Center(    child: Switch(        value: _value,        onChanged: (bool value) {               setState(() {                _value=value;              if (_value==true) {             final snackBar = SnackBar(content: Text('开'),);              Scaffold.of(context).showSnackBar(snackBar);           } else {            final snackBar = SnackBar(content: Text('关'),);              Scaffold.of(context).showSnackBar(snackBar);           }              });            },      )    )    );     }}复制代码
    

2_Radio(单选框)

import 'package:flutter/material.dart';void main() => runApp(MyApp());class MyApp extends StatelessWidget {  @override  Widget build(BuildContext context) {    return MaterialApp(      home: Scaffold(        appBar: AppBar(          title: Text('RadioListTile Demo'),        ),        body: SnackBarPage(),      ),    );  }}class SnackBarPage extends StatefulWidget {  @override  _SnackBarPageState createState() => _SnackBarPageState();}class _SnackBarPageState extends State
    
      { String _groupValue='升压';  @override  Widget build(BuildContext context) {         return Container(      child: Column(        children: 
     
      [          RadioListTile
      
       (            value: '升压',            title: Text('升压'),            groupValue: _groupValue,            onChanged: (value){              setState(() {                _groupValue=value;              });            },          ),            RadioListTile
       
        (            value: '升降压',            title: Text('升降压'),            groupValue: _groupValue,            onChanged: (value){              setState(() {                _groupValue=value;              });            },          ),            RadioListTile
        
         (            value: '降压',            title: Text('降压'),            groupValue: _groupValue,            onChanged: (value){              setState(() {                _groupValue=value;              });            },          ),          RaisedButton(            onPressed: (){              final snackBar = SnackBar(content: Text('你选择的是$_groupValue'),);              Scaffold.of(context).showSnackBar(snackBar);            },            child: Text('确定'),          ),        ],      )    );     }}复制代码
        
       
      
     
    

3_Checkbox(复选框)

import 'package:flutter/material.dart';void main() => runApp(MyApp());class MyApp extends StatelessWidget {  @override  Widget build(BuildContext context) {    return MaterialApp(      home: Scaffold(        appBar: AppBar(          title: Text('RadioListTile Demo'),        ),        body: SnackBarPage(),      ),    );  }}class SnackBarPage extends StatefulWidget {  @override  _SnackBarPageState createState() => _SnackBarPageState();}class _SnackBarPageState extends State
    
      { bool _value=false; bool _value1=false; bool _value2=false;  @override  Widget build(BuildContext context) {         return Container(      child: Column(        children: 
     
      [        CheckboxListTile(          value: _value,          title: Text('升压'),          onChanged: (value){            setState(() {              _value=value;            });          },        ),        CheckboxListTile(          value: _value1,          title: Text('升降压'),          onChanged: (value){            setState(() {              _value1=value;            });          },        ),   CheckboxListTile(          value: _value2,          title: Text('降压'),          onChanged: (value){            setState(() {              _value2=value;            });          },        ),        RaisedButton(            onPressed: (){              final snackBar = SnackBar(content: Text('升压$_value,升降压$_value1,降压$_value2'),);              Scaffold.of(context).showSnackBar(snackBar);            },            child: Text('确定'),          ),        ],      )    );     }}复制代码