在 iPad 挂起模式后 flutter_inappwebview 资产不可用

如何解决在 iPad 挂起模式后 flutter_inappwebview 资产不可用

我使用 Flutter_inappwebview 及其 InAppLocalhostServer 构建了一个应用程序。 一切正常，我可以通过 window.location.href = "test2.html"; 使用 javascript 从资产文件夹中的一个 html 文件 (test.html) 切换到另一个 (test2.html)。

但是当 iPad 切换到暂停模式（或按下电源开关）超过一两分钟时，所有资产都不再可用。

这是我的 main.dart：

import 'dart:async';

import 'package:Flutter/material.dart';
import 'package:Flutter_inappwebview/Flutter_inappwebview.dart';

InAppLocalhostServer localhostServer = new InAppLocalhostServer();

Future main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await localhostServer.start();
  runApp(new MyApp());
}

class MyApp extends StatefulWidget {
  @override _MyAppState createState() => new _MyAppState();
}

class _MyAppState extends State<MyApp> {

  InAppWebViewController _webViewController;

  String url = "";


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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,home: Scaffold(
        body: Container(
            child: Column(children: <Widget>[
              Expanded(
                child: Container(
                  child: InAppWebView(
                    initialUrl: "http://localhost:8080/assets/slides/test.html",initialHeaders: {},initialOptions: InAppWebViewGroupOptions(
                        crossplatform: InAppWebViewOptions(
                          debuggingEnabled: true,)
                    ),onWebViewCreated: (InAppWebViewController controller) {
                      _webViewController = controller;
                    },onLoadStart: (InAppWebViewController controller,String url) {
                    },onLoadStop: (InAppWebViewController controller,),)
              ),])
        ),);
  }
}

这是我的 pubspec.yml

name: crash_app
description: Test App

# The following line prevents the package from being accidentally published to
# pub.dev using `pub publish`. This is preferred for private packages.
publish_to: 'none' # Remove this line if you wish to publish to pub.dev

# The following defines the version and build number for your application.
# A version number is three numbers separated by dots,like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in Flutter
# build by specifying --build-name and --build-number,respectively.
# In Android,build-name is used as versionName while build-number used as versionCode.
# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
# In iOS,build-name is used as CFBundleShortVersionString while build-number used as CFBundLeversion.
# Read more about iOS versioning at
# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
version: 1.0.0+1

environment:
  sdk: ">=2.7.0 <3.0.0"

dependencies:
  Flutter:
    sdk: Flutter


  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^1.0.0

  # inAppWebView for localhost webserver
  Flutter_inappwebview: ^4.0.0+4

dev_dependencies:
  Flutter_test:
    sdk: Flutter

# For information on the generic Dart part of this file,see the
# following page: https://dart.dev/tools/pub/pubspec

# The following section is specific to Flutter.
Flutter:

  # The following line ensures that the Material Icons font is
  # included with your application,so that you can use the icons in
  # the material Icons class.
  uses-material-design: true

  # To add assets to your application,add an assets section,like this:
  # assets:
  #   - images/a_dot_burr.jpeg
  #   - images/a_dot_ham.jpeg
  assets:
    - assets/
    - assets/js/
    - assets/slides/

  # An image asset can refer to one or more resolution-specific "variants",see
  # https://Flutter.dev/assets-and-images/#resolution-aware.

  # For details regarding adding assets from package dependencies,see
  # https://Flutter.dev/assets-and-images/#from-packages

  # To add custom fonts to your application,add a fonts section here,# in this "Flutter" section. Each entry in this list should have a
  # "family" key with the font family name,and a "fonts" key with a
  # list giving the asset and other descriptors for the font. For
  # example:
  # fonts:
  #   - family: Schyler
  #     fonts:
  #       - asset: fonts/Schyler-Regular.ttf
  #       - asset: fonts/Schyler-Italic.ttf
  #         style: italic
  #   - family: Trajan Pro
  #     fonts:
  #       - asset: fonts/TrajanPro.ttf
  #       - asset: fonts/TrajanPro_Bold.ttf
  #         weight: 700
  #
  # For details regarding fonts from package dependencies,# see https://Flutter.dev/custom-fonts/#from-packages

有谁知道为什么我的所有资产在暂停模式后都消失了？

非常感谢您的帮助！