Как увеличить шрифт текста с помощью setstate() во flutter?

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class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {

  double _fontSize = 20;

  void _increaseFontSize() {
    setState(() {
      _fontSize += 2;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Increase font size example'),
      ),
      body: Center(
        child: Text(
          'Hello, world!',
          style: TextStyle(
            fontSize: _fontSize,
          ),
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _increaseFontSize,
        child: Icon(Icons.add),
      ),
    );
  }
}