如何预加载flutter webview小部件

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

class PreloadWebView extends StatefulWidget {
  @override
  _PreloadWebViewState createState() => _PreloadWebViewState();
}

class _PreloadWebViewState extends State<PreloadWebView> {
  final flutterWebViewPlugin = FlutterWebviewPlugin();

  @override
  void initState() {
    super.initState();
    // 在初始化阶段预加载WebView
    flutterWebViewPlugin.launch('https://example.com');
  }

  @override
  void dispose() {
    // 在小部件销毁时释放资源
    flutterWebViewPlugin.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return WebviewScaffold(
      url: 'https://example.com',
      appBar: AppBar(
        title: Text('预加载WebView'),
      ),
    );
  }
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter WebView预加载示例',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: PreloadWebView(),
    );
  }
}