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/// 初始化时设置为只能竖屏
@override
  void initState() {
    SystemChrome.setPreferredOrientations([
      DeviceOrientation.portraitUp,
      DeviceOrientation.portraitDown
    ]);
    super.initState();
  }

/// 退出时还原四个方向
dispose(){
    SystemChrome.setPreferredOrientations([
      DeviceOrientation.portraitUp,
      DeviceOrientation.portraitDown,
      DeviceOrientation.landscapeLeft,
      DeviceOrientation.landscapeRight,
    ]);
    super.dispose();
  }