Flutter基础使用汇总

• Flutter 监听返回按键
• Flutter 防止屏幕翻转
• BMW WARNING
  • NOTICE
  • Material
  • Warrant

Flutter 监听返回按键

通过 WillPopScope 组件来注册监听回调

Widget build(BuildContext context) {
  return WillPopScope(
      onWillPop: _requestPop,
      child: Scaffold(
        appBar: AppBar(
          title: Text('测试代码'),
          leading: IconButton(
            icon: Icon(Icons.arrow_back),
            onPressed: () {
              print("退出${Navigator.canPop(context)}");
              if (Navigator.canPop(context)) {
                Navigator.pop(context);
              } else {
                SystemNavigator.pop();
              }
            },
          ),
        ),
       ),
    );
   }

Future<bool> _requestPop() {
    print("POP");
    if (Navigator.canPop(context)) {
      Navigator.pop(context);
    } else {
      SystemNavigator.pop();
    }
    return Future.value(false);
  }

Flutter 防止屏幕翻转

在 main.dart 入口中加入如下代码

void main() {
  HttpOverrides.global = new MyHttpOverrides();
  // runApp(MyApp());
  WidgetsFlutterBinding.ensureInitialized();
  SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp])
      .then((_) {
        runApp(new MyApp());
  });
}

BMW WARNING

• Bulletin

I am a bucolic migrant worker but I never walk backwards.

• Material

• Warrant

本文作者： Skyline(lty)
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