Flutter (webview_flutter) 滑动返回 Pop Webview

Question

. Answers to this question are eligible for a +50 reputation bounty. Matt is looking for a .

I use the below code for a Flutter Webview (webview_flutter package).

When a Back button is clicked, _goBack() sets whether to go back to the previous page, or if no previous page, pops the webview.

I then enabled gestureNavigationEnabled:true to allow the user to swipe back to previous pages. Works well. However, when there are no previous pages, swiping does not pop the webview.

Is there a way to give swiping back the same behavior as the Back button ?

1. if previous page exists, swipes to the previous page
2. if no previous page, swipe closes the webview

Thank you.

import 'package:webview_flutter/webview_flutter.dart';

     body: WillPopScope(
      onWillPop: () => _goBack(context),
      child: WebView(  
        initialUrl: widget.url,
        gestureNavigationEnabled: true,
        onWebViewCreated: (WebViewController webViewController) {
          _controllerCompleter.future.then((value) => _controller = value);
          _controllerCompleter.complete(webViewController);
      ),
    ),

      Future<bool> _goBack(BuildContext context) async {
        if (await _controller.canGoBack()) {
          _controller.goBack();
          return Future.value(false);
        } else {
          Navigator.of(context).pop();
          return Future.value(true);
        }
      }

Answer 1

The Problem is the 'Context' when it found no context it doesnt close the webview window.so in this case what you need to do is:

Look at this here: https://github.com/brianegan/flutter_redux/issues/5#issuecomment-361215074

You can set a global key for your navigation:

    final GlobalKey<NavigatorState> navigatorKey = new GlobalKey<NavigatorState>();

Pass it to MaterialApp:

    new MaterialApp(
          title: 'MyApp',
          onGenerateRoute: generateRoute,
          navigatorKey: navigatorKey,
        );

Push routes:

    navigatorKey.currentState.pushNamed('/someRoute');

You Need to Create a Global Key for Navigation and then it can work. it will close the window without getting the context (means if the previous page is not there then it can also pop the window )