在Flutter中会有来自本地资源html文件的离线webview吗？

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import import 'package:webview_flutter/webview_flutter.dart';

class OfflineWebView extends StatefulWidget {
  @override
  _OfflineWebViewState createState() => _OfflineWebViewState();
}

class _OfflineWebViewState extends State<OfflineWebView> {
  final Completer<WebViewController> _controller =
      Completer<WebViewController>();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Offline WebView'),
      ),
      body: FutureBuilder<String>(
        future: _loadLocalHTML(),
        builder: (BuildContext context, AsyncSnapshot<String> snapshot) {
          if (snapshot.hasData) {
            return WebView(
              initialUrl: Uri.dataFromString(snapshot.data,
                      mimeType: 'text/html')
                  .toString(),
              javascriptMode: JavascriptMode.unrestricted,
              onWebViewCreated: (WebViewController webViewController) {
                _controller.complete(webViewController);
              },
            );
          } else if (snapshot.hasError) {
            return Center(
              child: Text('Error loading HTML'),
            );
          } else {
            return Center(
              child: CircularProgressIndicator(),
            );
          }
        },
      ),
    );
  }

  Future<String> _loadLocalHTML() async {
    return await rootBundle.loadString('assets/offline.html');
  }
}

flutter:
  assets:
    - assets/offline.html