Offstage 用法

         Offstage(
                              offstage: !isPreview,
                              child: Container(
                                child: Row(
                                  children: [
                                    Icon(
                                      Icons.search,
                                      color: Color.fromRGBO(199, 199, 204, 1.00),
                                    ),
                                    Text('4.'),
                                    Text('8')
                                  ],
                                ),
                              ),
                            )