iosWebViewFix/example/lib/in_app_browser_example.screen.dart

import 'dart:async';
import 'dart:collection';

import 'package:flutter/material.dart';
import 'package:flutter_inappwebview/flutter_inappwebview.dart';

import 'main.dart';

class MyInAppBrowser extends InAppBrowser {

  MyInAppBrowser({int? windowId, UnmodifiableListView<UserScript>? initialUserScripts}) : super(windowId: windowId, initialUserScripts: initialUserScripts);

  @override
  Future onBrowserCreated() async {
    print("\n\nBrowser Created!\n\n");
  }

  @override
  Future onLoadStart(url) async {
    print("\n\nStarted $url\n\n");
  }

  @override
  Future onLoadStop(url) async {
    print("\n\nStopped $url\n\n");
  }

  @override
  void onLoadError(url, code, message) {
    print("Can't load $url.. Error: $message");
  }

  @override
  void onProgressChanged(progress) {
    print("Progress: $progress");
  }

  @override
  void onExit() {
    print("\n\nBrowser closed!\n\n");
  }

  @override
  Future<ShouldOverrideUrlLoadingAction> shouldOverrideUrlLoading(
      shouldOverrideUrlLoadingRequest) async {
    print("\n\nOverride ${shouldOverrideUrlLoadingRequest.url}\n\n");
    return ShouldOverrideUrlLoadingAction.ALLOW;
  }

  @override
  void onLoadResource(response) {
    print("Started at: " +
        response.startTime.toString() +
        "ms ---> duration: " +
        response.duration.toString() +
        "ms " +
        response.url!);
  }

  @override
  void onConsoleMessage(consoleMessage) {
    print("""
    console output:
      message: ${consoleMessage.message}
      messageLevel: ${consoleMessage.messageLevel!.toValue()}
   """);
  }
}

class InAppBrowserExampleScreen extends StatefulWidget {
  final MyInAppBrowser browser = new MyInAppBrowser();

  @override
  _InAppBrowserExampleScreenState createState() =>
      new _InAppBrowserExampleScreenState();
}

class _InAppBrowserExampleScreenState extends State<InAppBrowserExampleScreen> {
  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
            title: Text(
          "InAppBrowser",
        )),
        drawer: myDrawer(context: context),
        body: Center(
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                RaisedButton(
                    onPressed: () async {
                      await widget.browser.openFile(
                          assetFilePath: "assets/index.html",
                          options: InAppBrowserClassOptions(
                              inAppWebViewGroupOptions: InAppWebViewGroupOptions(
                                  crossPlatform: InAppWebViewOptions(
                            useShouldOverrideUrlLoading: true,
                            useOnLoadResource: true,
                          ))));
                    },
                    child: Text("Open In-App Browser")),
                Container(height: 40),
                RaisedButton(
                    onPressed: () async {
                      await InAppBrowser.openWithSystemBrowser(
                          url: "https://flutter.dev/");
                    },
                    child: Text("Open System Browser")),
            ])));
  }
}