按下按钮时如何在Flutter上更改文本样式

class _scanningState extends State<scanning> {  bool pressed = true;  @override  Widget build(BuildContext context) {    return Scaffold(        backgroundColor: Colors.blue,        body: new Column(          children: <Widget>[ new Text(strText,         style: pressed         ? TextStyle(color: Colors.black)         : TextStyle(color:Colors.green), ), new RaisedButton(   child: new Text(     'Change color'),   onPressed: () {     setState(() {       pressed = !pressed;     });   }, )          ],        ));  }

也许您想更改兄弟文本。概念是相同的。快乐扑