flutter/examples/flutter_gallery/lib/demo/cupertino/cupertino_switch_demo.dart

// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

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

class CupertinoSwitchDemo extends StatefulWidget {
  static const String routeName = '/cupertino/switch';

  @override
  _CupertinoSwitchDemoState createState() => new _CupertinoSwitchDemoState();
}

class _CupertinoSwitchDemoState extends State<CupertinoSwitchDemo> {

  bool _switchValue = false;

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: const Text('Cupertino Switch'),
      ),
      body: new Center(
        child:  new CupertinoSwitch(
          value: _switchValue,
          onChanged: (bool value) {
            setState(() {
              _switchValue = value;
            });
          }
        ),
      ),
    );
  }
}