Flutter 强制横屏实现

在main.dart中添加如下代码

void main() {
  // 强制横屏
  WidgetsFlutterBinding.ensureInitialized();
  SystemChrome.setPreferredOrientations([DeviceOrientation.landscapeLeft, DeviceOrientation.landscapeRight]).then((onVal) {
    runApp(MyApp());
  });
}