Created
January 24, 2023 23:51
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Adaptive UI Talk: Example of handling light mode and dark mode in Cupertino.
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| import 'package:flutter/cupertino.dart'; | |
| import 'package:flutter/material.dart' show Icons; | |
| void main() { | |
| runApp(const MyApp()); | |
| } | |
| class MyApp extends StatefulWidget { | |
| const MyApp({super.key}); | |
| @override | |
| State<MyApp> createState() => _MyAppState(); | |
| } | |
| class _MyAppState extends State<MyApp> with WidgetsBindingObserver { | |
| Brightness _brightness = Brightness.light; | |
| @override | |
| void initState() { | |
| super.initState(); | |
| WidgetsBinding.instance.addObserver(this); | |
| _brightness = WidgetsBinding.instance.window.platformBrightness; | |
| } | |
| @override | |
| void didChangePlatformBrightness() { | |
| if (mounted) { | |
| setState(() { | |
| _brightness = WidgetsBinding.instance.window.platformBrightness; | |
| }); | |
| } | |
| super.didChangePlatformBrightness(); | |
| } | |
| @override | |
| void dispose() { | |
| WidgetsBinding.instance.removeObserver(this); | |
| super.dispose(); | |
| } | |
| @override | |
| Widget build(BuildContext context) { | |
| return CupertinoApp( | |
| debugShowCheckedModeBanner: false, | |
| theme: CupertinoThemeData( | |
| brightness: _brightness, | |
| ), | |
| home: const CupertinoPageScaffold( | |
| navigationBar: CupertinoNavigationBar( | |
| middle: Text('Flutter Forward 2023'), | |
| ), | |
| child: _MyPage(), | |
| ), | |
| ); | |
| } | |
| } | |
| class _MyPage extends StatelessWidget { | |
| const _MyPage(); | |
| @override | |
| Widget build(BuildContext context) { | |
| return Center( | |
| child: Icon( | |
| CupertinoTheme.of(context).brightness == Brightness.light | |
| ? Icons.light_mode | |
| : Icons.dark_mode, | |
| color: const CupertinoDynamicColor.withBrightness( | |
| color: CupertinoColors.black, | |
| darkColor: CupertinoColors.white, | |
| ).resolveFrom(context), | |
| size: 100.0, | |
| ), | |
| ); | |
| } | |
| } |
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