flutter-unity/community

Hi. Is there any solution to call setState in OnUnityMessage when re-open unity?juicycleff/flutter-unity-view-widget#225 . Android works well but iOS fails.
I think it might be the LifeCycle issue. Unity never exit and other widget was rebuild when reopen the same page.
The following is what I did on simple_screen.dart:

1. Add a new bool isTouched=false
2. Make isTouched as the condition to control the title of AppBar.
   this.isTouched ? Text("Don't touch me!") : Text("Touch me please!"),
3. Call setState when recieve message from flutter.
   debugPrint("Mounted state: ${this.mounted.toString()}"); setState(() { this.isTouched = !this.isTouched; });
   Everything works well for the first. However, when I reopen the same page, the setState fails. And also, the this.mounted turns out to be false, which means that this widget is not mounted.

Here is the full code of simple_screen.dart

import 'package:flutter/material.dart';
import 'package:flutter_unity_widget/flutter_unity_widget.dart';
import 'package:flutter_unity_widget_example/utils/screen_utils.dart';


class SimpleScreen extends StatefulWidget {
  @override
  _SimpleScreenState createState() => _SimpleScreenState();
}

class _SimpleScreenState extends State<SimpleScreen> {
  static final GlobalKey<ScaffoldState> _scaffoldKey =
      GlobalKey<ScaffoldState>();
  UnityWidgetController _unityWidgetController;
  double _sliderValue = 0.0;

  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    final ScreenArguments arguments =
        ModalRoute.of(context).settings.arguments as ScreenArguments;

    return Scaffold(
      appBar: AppBar(
        title:
            this.isTouched ? Text("Don't touch me!") : Text("Touch me please!"),
      ),
      body: Card(
          margin: const EdgeInsets.all(8),
          clipBehavior: Clip.antiAlias,
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(20.0),
          ),
          child: Stack(
            children: [
              UnityWidget(
                onUnityViewCreated: onUnityCreated,
                isARScene: arguments.enableAR,
                onUnityMessage: onUnityMessage,
              ),
              Positioned(
                bottom: 20,
                left: 20,
                right: 20,
                child: Card(
                  elevation: 10,
                  child: Column(
                    children: <Widget>[
                      Padding(
                        padding: const EdgeInsets.only(top: 20),
                        child: Text("Rotation speed:"),
                      ),
                      Slider(
                        onChanged: (value) {
                          setState(() {
                            _sliderValue = value;
                          });
                          setRotationSpeed(value.toString());
                        },
                        value: _sliderValue,
                        min: 0,
                        max: 20,
                      ),
                    ],
                  ),
                ),
              ),
            ],
          )),
    );
  }

  void setRotationSpeed(String speed) {
    _unityWidgetController.postMessage(
      'Cube',
      'SetRotationSpeed',
      speed,
    );
  }

  bool isTouched = false;

  void onUnityMessage(controller, message) {
    debugPrint("Mounted state: ${this.mounted.toString()}");

    setState(() {
      this.isTouched = !this.isTouched;
    });
    debugPrint(
        'Received message from unityffffff: ${message.toString()}  ${this.isTouched.toString()}');
  }

  void setStateForTouch() {
    setState(() {
      this.isTouched = true;
    });
  }

  // Callback that connects the created controller to the unity controller
  void onUnityCreated(controller) async {
    this._unityWidgetController = controller;
  }
}

Can anyone help me to solve this problem?