flutter 强制竖屏和横屏

参考：https://blog.csdn.net/u013185272/article/details/85695630?utm_medium=distribute.pc_relevant.none-task-blog-searchFromBaidu-3.control&depth_1-utm_source=distribute.pc_relevant.none-task-blog-searchFromBaidu-3.control

强制横屏：

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

强制竖屏：

void main(){
  // 强制竖屏
  SystemChrome.setPreferredOrientations([
    DeviceOrientation.portraitUp,
    DeviceOrientation.portraitDown
  ]);
 
  runApp(new MyApp());
}

以上代码写在main.dart文件中