Flutter的Switch和Slider

Switch

import 'package:flutter/material.dart';

class SwitchDemo extends StatefulWidget {
  @override
  _SwitchDemoState createState() => _SwitchDemoState();
}

class _SwitchDemoState extends State<SwitchDemo> {
  bool _switchA = false;
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('SwitchDemo'),
        elevation: 0.0,
      ),
      body: Container(
        padding: EdgeInsets.all(16.0),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(_switchA ? '☺' :'😭',style: TextStyle(fontSize: 32.0)),
            Switch(
              value: _switchA,
              onChanged: (value) {
                setState(() {
                  _switchA = value;
                });
              },

            )
          ],
        ),
      ),
    );
  }
}

SwitchListTile

 SwitchListTile(
              value: _switchA,
              onChanged: (value) {
                setState(() {
                  _switchA = value;
                });
              },
              title: Text('Switch Item A'),
              subtitle:Text('Description'),
              secondary: _switchA ? Icon(Icons.visibility):Icon(Icons.visibility_off),
              selected: _switchA,
            )
            

Slider

 Slider(
                  value: _sliderA,
                  onChanged: (value) {
                    setState(() {
                      _sliderA = value;
                    });
                  },
                  min: 0.0,
                  max: 10.0,
                  divisions: 10,
                  activeColor: Theme.of(context).accentColor,
                  inactiveColor: Theme.of(context).accentColor.withOpacity(0.3),
                  label: '${_sliderA.toInt()}',
                  
                )