flutter 判断平台/设置状态栏样式

@override
  Widget build(BuildContext context) {
    // TODO: implement build
    //状态栏颜色
    SystemChrome.setSystemUIOverlayStyle(SystemUiOverlayStyle.dark);
    if (tabs.length > 0 && tabPages.length > 0) {
      setState(() {
        _isLoading = false;
      });
    }

    //判断平台
    if (Theme.of(context).platform == TargetPlatform.iOS) {}
  }