Orientation change clears canvas on iOS

[kmusham]

Hi, One of our customers reported that changing the device orientations wipes or clears the signature they have added. This issue is happening only on iOS, android works fine. Do you think it is a bug in the libraries, if so, do you have any recommendations for us until the issue is fixed? Thanks

[MartinHlavna]

Hi, we will look on this. However if it is iOS only problem help would be welcomed.

[ioxua]

If you have a StatefulWidget, a possible workaround for this is saving the state yourself. As a sidenote, I was able to reproduce the error on an Android app, so it is not iOS exclusive

class MyWidget extends StatefulWidget {
  @override
  State<StatefulWidget> createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  List<Point> _currentPoints;

  @override
  Widget build(BuildContext context) {
    Signature signature = Signature(
      points: _currentPoints ?? [],
      onChanged: (newPoints) {
        setState(() {
          _currentPoints = newPoints;
        });
      },
    );
  }
}

[MartinHlavna]

This is fixed in 3.0.0 as data are stored in controller not in widget itself