带子标题的HAML表

Question

我需要使副标题正确工作在我的桌子上，以便为它设置样式。目前，我没有成功。对于每个子标题，分别进入Under1Subheader，Under2ndSubheader和Under3rdSubheader。

 componentWillUnmount() {
    BackHandler.removeEventListener('hardwareBackPress', this.handleBackPress);
   }
   componentDidMount() {
    BackHandler.addEventListener('hardwareBackPress', this.handleBackPress);
 }

    handleBackPress = () => {

        console.log("handleBackPress Called on RootMenuView : current View ? : " + this.state.mainView);

        if (this.state.mainView === "Main"){
            return false;
        } else{
             //not this
            //this.state.mainView = "Main";
            // use this
           this.setState({mainView: "Main"})
            this.forceUpdate();
            return true;
        }

    }