React native wix react本机导航版本2-屏幕上未显示Fab图标

晶圆厂图标不显示在屏幕上。我已经根据V2文档添加了源代码，如下所示

  static get options() {
    return {
      topBar: {
        title: {
          text: "Collapse",
          color: "black",
          fontSize: 16
        },
        drawBehind: true,
        visible: true,
        testID: "addLiveSale"
      },
      fab: {
        id: "addLiveSale",
        backgroundColor: "blue",
        clickColor: "blue",
        rippleColor: "aquamarine",
        hideOnScroll: true
      }
    };
  }