Multiple WebView Reload issue Flutter

问题

I have used multiple Webviews with Separate BottomNavigationBarItem tabs and load different URL in each tab.

The issue is that when if open first the first TAB URL load perfectly but when I tap on the Second tab that it Displays first tab Webview. The third tab contains normal Text Widget if comeback from the third tab then work perfectly But click on first and second tab Always Display the last loaded URL my code is here

Home Class

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

class Home extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return _HomeState();
  }
}

class _HomeState extends State<Home> {

  int _selectedIndex = 0;

  static const TextStyle optionStyle = TextStyle(fontSize: 30, fontWeight: FontWeight.bold);

  List<Widget> _widgetOptions = <Widget>[
    WebViewContainer('https://offerscouponsdeals.in/'),
    WebViewContainer('https://flutter.io'),
    Text(
      'Index 2: School',
      style: optionStyle,
    ),
  ];

  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('RSVP App'),
      ),
      body: Center(
        child: _widgetOptions.elementAt(_selectedIndex),
      ),
      bottomNavigationBar: BottomNavigationBar(
        items: const <BottomNavigationBarItem>[
          BottomNavigationBarItem(
            icon: Icon(Icons.home),
            title: Text('Home'),
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.business),
            title: Text('Business'),
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.school),
            title: Text('School'),
          ),
        ],
        currentIndex: _selectedIndex,
        onTap: _onItemTapped,
      ),
    );
  }
  void _onItemTapped(int index) {
    setState(() {
      _selectedIndex = index;
    });
  }
}

WebView Container Class

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

class _WebViewContainerState extends State < WebViewContainer >{
  var _url;
  final _key = UniqueKey();
  _WebViewContainerState(this._url);
  num _stackToView = 1;

  void _handleLoad(String value) {
    setState(() {
      _stackToView = 0;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        body: IndexedStack(
          index: _stackToView,
          children: [
            Column(
              children: < Widget > [
                Expanded(
                    child: WebView(
                      key: _key,
                      javascriptMode: JavascriptMode.unrestricted,
                      initialUrl: _url,
                      onPageFinished: _handleLoad,
                    )
                ),
              ],
            ),
            Container(
              color: Colors.white,
              child: Center(
                child: CircularProgressIndicator(),
              ),
            ),
          ],
        )
    );
  }
}

class WebViewContainer extends StatefulWidget {
  final url;
  WebViewContainer(this.url);
  @override
  createState() => _WebViewContainerState(this.url);
}

Can someone tell me where I am Wrong? Thanks in advance

回答1:

Finally, I have done with WebViewController Here is answer multiple Webview reload with Loader

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

class Home extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return _HomeState();
  }
}

class _HomeState extends State<Home> {

  final _key = UniqueKey();
  bool _isLoadingPage;
  WebViewController controller;
  int _selectedIndex = 0;

  List<String> arr_links = [
    'https://pub.dev/',
    'https://flutter.io',
    'https://www.google.com/',
  ];

  @override
  void initState() {
    super.initState();
    _isLoadingPage = true;
  }


  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Multiple WebView'),
      ),
      body: Stack(
        children: <Widget>[
          WebView(
            key: _key,
            initialUrl: arr_links[_selectedIndex],
            javascriptMode: JavascriptMode.unrestricted,
          onWebViewCreated: (WebViewController webViewController) {
            controller = webViewController;
          },
            onPageFinished: (finish) {
              setState(() {
                _isLoadingPage = false;
              });
            },
          ),
          _isLoadingPage ? Scaffold(
            body: Center(
              child: CircularProgressIndicator(
                valueColor: new AlwaysStoppedAnimation<Color>(
                    Colors.white),
              ),
            ),
            backgroundColor: Colors.black.withOpacity(
                0.70), // this is the main reason of transparency at next screen. I am ignoring rest implementation but what i have achieved is you can see.
          ) : Stack()
        ],
      ),

      bottomNavigationBar: BottomNavigationBar(
        items: const <BottomNavigationBarItem>[
          BottomNavigationBarItem(
            icon: Icon(Icons.home),
            title: Text('Home'),
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.business),
            title: Text('Business'),
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.school),
            title: Text('School'),
          ),
        ],
        currentIndex: _selectedIndex,
        onTap: _onItemTapped,
      ),
    );
  }
  void _onItemTapped(int index) {
    setState(() {
      _selectedIndex = index;
      _isLoadingPage = true;
      controller.loadUrl(arr_links[_selectedIndex]);
    });
  }
}

Add this to your package's pubspec.yaml file:

dependencies:
  webview_flutter: ^0.3.22+1

来源：https://stackoverflow.com/questions/58625803/multiple-webview-reload-issue-flutter