How to change a text style on Flutter when button pressed

Question

Is anyone know how to change a text style on Flutter when the button pressed?

As example, i have a code like this :

class _scanningState extends Stat         


        

Answer 1

I recommend you to read about Stateful Widgets https://flutter.io/tutorials/interactive/#stateful-stateless

    class _scanningState extends State<scanning> {
      bool pressed = false;
      String strText = 'ABCDEFG';

      @override
      Widget build(BuildContext context) {
        return Scaffold(
            backgroundColor: Colors.blue,
            body: new Column(
              children: <Widget>[
                new Text(strText),
                new RaisedButton(
                  child: new Text(
                    'Button',
                    style: pressed
                        ? TextStyle(fontSize: 30.0)
                        : TextStyle(fontSize: 10.0),
                  ),
                  onPressed: () {
                    //Change text style of strText()???
                    setState(() {
                      pressed = !pressed;
                    });
                  },
                )
              ],
            ));
      }

Answer 2

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;
                });
              },
            )
          ],
        ));
  }

Maybe you want to change the sibling text. The concept is the same. Happy Flutter