如何在颤动中强制应用程序进入肖像模式

Question

void main(){
  ///
  /// Force the layout to Portrait mode
  /// 
  SystemChrome.setPreferredOrientations([
    DeviceOrientation.portraitUp,
    DeviceOrientation.portraitDown
  ]);

  runApp(new MyApp());
}

Answer 1

将此代码放在 MyApp() 中，不要忘记导入服务包：

  SystemChrome.setPreferredOrientations([
    DeviceOrientation.portraitUp,
    DeviceOrientation.portraitDown,
  ]);

如下：

import 'package:flutter/services.dart';

class MyApp extends StatelessWidget {
    @override
    Widget build(BuildContext context) {
      SystemChrome.setPreferredOrientations([
        DeviceOrientation.portraitUp,
        DeviceOrientation.portraitDown,
      ]);
      return new MaterialApp();
    }
  }

更新

根据@F-1 的评论，有一个错误会阻止此代码在 ipad github.com/flutter/flutter/issues/27235 上运行。

下面的评论可能会对你有所帮助。

https://github.com/flutter/flutter/issues/27235#issuecomment-508995063

Answer 2

这是适用于Android 和iOS 的代码

Future main() async {
  await SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp]);
  runApp(new MyApp());
}

Answer 3

以下代码对我有用。

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_app/splashScreen.dart';

    void main() {
      WidgetsFlutterBinding.ensureInitialized();
      SystemChrome.setPreferredOrientations([
        DeviceOrientation.portraitUp,
        DeviceOrientation.portraitDown,
      ]);

  runApp(MaterialApp(home: splashScreen(),));
}