I need to customize the switch button in flutter

问题

this is flutter switch button: -

I want this design: -

回答1:

You can use package https://pub.dev/packages/custom_switch or fork it and modify to your

full code

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.deepOrange
      ),
      home: HomeScreen(),
    );
  }
}


class HomeScreen extends StatefulWidget {
  @override
  _HomeScreenState createState() => _HomeScreenState();
}

class _HomeScreenState extends State<HomeScreen> {

  bool status = false;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Custom Switch Example'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            CustomSwitch(
              activeColor: Colors.pinkAccent,
              value: status,
              onChanged: (value) {
                print("VALUE : $value");
                setState(() {
                  status = value;
                });
              },
            ),
            SizedBox(height: 12.0,),
            Text('Value : $status', style: TextStyle(
              color: Colors.black,
              fontSize: 20.0
            ),)
          ],
        ),
      ),
    );
  }
}

回答2:

You can achieve such design using this packages:

This usage is from their readme

import 'package:custom_switch_button/custom_switch_button.dart';

bool isChecked = false;

return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Custom Switch Button example app'),
        ),
        body: GestureDetector(
          onTap: () {
            setState(() {
              isChecked = !isChecked;
            });
          },
          child: Center(
            child: CustomSwitchButton(
              backgroundColor: Colors.blueGrey,
              unCheckedColor: Colors.white,
              animationDuration: Duration(milliseconds: 400),
              checkedColor: Colors.lightGreen,
              checked: isChecked,
            ),
          ),
        ),
      ),
    );

Final result:

回答3:

Create A custom switch class

class CustomSwitch extends StatefulWidget {
    final bool value;
    final ValueChanged<bool> onChanged;

    CustomSwitch({
      Key key,
      this.value,
      this.onChanged})
      : super(key: key);

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

class _CustomSwitchState extends State<CustomSwitch>
     with SingleTickerProviderStateMixin {
    Animation _circleAnimation;
    AnimationController _animationController;

    @override
    void initState() {
       super.initState();
      _animationController = AnimationController(vsync: this, duration: Duration(milliseconds: 60));
      _circleAnimation = AlignmentTween(
          begin: widget.value ? Alignment.centerRight : Alignment.centerLeft,
          end: widget.value ? Alignment.centerLeft :Alignment.centerRight).animate(CurvedAnimation(
          parent: _animationController, curve: Curves.linear));
    }

  @override
  Widget build(BuildContext context) {
      return AnimatedBuilder(
               animation: _animationController,
               builder: (context, child) {
                      return GestureDetector(
                             onTap: () {
                                 if (_animationController.isCompleted) {
                                     _animationController.reverse();
                                 } else {
                                     _animationController.forward();
                                 }
                                widget.value == false
                                     ? widget.onChanged(true)
                                     : widget.onChanged(false);
                              },
                             child: Container(
                                     width: 45.0,
                                     height: 28.0,
                                     decoration: BoxDecoration(
                                     borderRadius: BorderRadius.circular(24.0),
                                     color: _circleAnimation.value == 
                                             Alignment.centerLeft
                                           ? Colors.grey
                                           : Colors.blue,
                                   child: Padding(
                                          padding: const EdgeInsets.only(
                                              top: 2.0, bottom: 2.0, right: 2.0, left: 2.0),
                                       child:  Container(
                                                 alignment: widget.value 
                                                    ? Alignment.centerRight 
                                                    : Alignment.centerLeft,
                                  child: Container(
                                          width: 20.0,
                                          height: 20.0,
                                          decoration: BoxDecoration(
                                                  shape: BoxShape.circle, 
                                                  color: Colors.white),
                                          ),
                                   ),
                                ),
                            ),
                          );
                     },
               );
         }
       }

Call this class as widget

_enable = false;

CustomSwitch(
   value: _enable ,
   onChanged: (bool val){
      setState(() {
         _enabled = val;
      });
   },
),

回答4:

set

bool _switchValue=true;

in your screen.dart

 CupertinoSwitch(
              value: _switchValue,
              onChanged: (value) {
                setState(() {
                  _switchValue = value;
                });
              },
            ),

来源：https://stackoverflow.com/questions/58463507/i-need-to-customize-the-switch-button-in-flutter