flutter - 滑动以返回在 ios 中的颤振 webview 中不起作用

Question

尝试过颤振网页视图。实施以控制参考此示例WillPopScope的背压。在 android 中滑动返回手势有效，但在 ios 中它不起作用。这不会检测手势。如何解决这个问题？

代码：

WebViewController controllerGlobal;
Future<bool> _exitApp(BuildContext context) async {
  print('back press');
  if (await controllerGlobal.canGoBack()) {
    print("onwill goback");
    controllerGlobal.goBack();
  } else {
    Scaffold.of(context).showSnackBar(
      const SnackBar(content: Text("No back history item")),
    );
    return Future.value(false);
  }
}


class _MyAppState extends State<MyApp> {
  final Completer<WebViewController> _controller =
      Completer<WebViewController>();

  @override
  Widget build(BuildContext context) {
    return WillPopScope(
      onWillPop: () => _exitApp(context),
      child: Scaffold(
        body: SafeArea(
          child: Builder(
            builder: (BuildContext context) {
              return WebView(
                initialUrl: 'https://flutter.dev',
                javascriptMode: JavascriptMode.unrestricted,
                onWebViewCreated: (WebViewController webViewController) {
                  _controller.complete(webViewController);
                },
                onPageFinished: (String url) {
                  print('Page finished loading: $url');
                },
              );
            },
          ),
        ),
      ),
    );
  }
}

注意：仅在 ios 模拟器中测试

Answer 1

WillPopScope 会导致这种情况。在https://github.com/flutter/flutter/issues/14203中查看更多详细信息