我是 Flutter 的新手，我想在其他小部件之间放置一个 Web 视图，并且我正在使用 InAppWebView 颤振来执行此操作，但我想阻止用户在单击按钮时导航到其他页面在 web 视图中。我是否必须为 iOS 和 Android 编写一些本机代码来阻止导航？
谢谢
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2053 次
4 回答
2
类似的东西：
InAppWebView(
....
shouldOverrideUrlLoading: (controller, navigationAction) async {
final uri = navigationAction.request.url!;
if(whitenAvigationHosts.contains(uri.host)){
return NavigationActionPolicy.ALLOW;
}
return NavigationActionPolicy.CANCEL;
})
于 2021-07-09T23:03:34.050 回答
1
要禁用将用户导航到另一个页面，您可以使用onPageCommitVisible回调来确定用户单击重定向到另一个页面的 url，因此只需在其中调用 goBack
InAppWebView(
onPageCommitVisible: (con,uri){
print("url ${uri.toString()}");
con.goBack();
},
),
于 2021-06-14T12:01:02.560 回答
0
禁用导航InAppWebView：-
我们在小部件中有onUpdateVisitedHistory属性。Inappwebview使用这个onUpdateVisitedHistory属性我们可以监听小部件中的 url 变化。Inappwebview所以禁用导航我们可以使用webcontroller.goback()方法。
小部件代码：
InAppWebView(
key: webViewKey,
onWebViewCreated: (controller) {
webViewController = controller;
_loadHtmlFromAssets();
},
onUpdateVisitedHistory: (controller, url, androidIsReload) {
if (url!.host.contains("google.com")) {
webViewController?.goBack();
//You can do anything
Navigator.push(
context,
MaterialPageRoute(builder: (context) => const Screen1()),
);
//Prevent that url works
return;
} else if (url.host.contains("yahoo.com")) {
//You can do anything
webViewController?.goBack();
Navigator.push(
context,
MaterialPageRoute(builder: (context) => const Screen3()),
);
//Prevent that url works
return;
} else if (url.host.contains("duckduckgo.com")) {
//You can do anything
webViewController?.goBack();
Navigator.push(
context,
MaterialPageRoute(builder: (context) => const Screen2()),
);
}
})
这里我们跳过加载搜索引擎并跳转到其他小部件
注意：如果我们没有添加webcontroller.goback().it 将加载站点并移动到小部件。如果我们回按它将显示网页。
示例代码：
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
WebViewController? _controller;
void _incrementCounter() {
setState(() {
_counter++;
});
}
final GlobalKey webViewKey = GlobalKey();
InAppWebViewController? webViewController;
late PullToRefreshController pullToRefreshController;
InAppWebViewGroupOptions options = InAppWebViewGroupOptions(
crossPlatform: InAppWebViewOptions(
useShouldOverrideUrlLoading: true,
mediaPlaybackRequiresUserGesture: false,
),
android: AndroidInAppWebViewOptions(
useHybridComposition: true,
),
ios: IOSInAppWebViewOptions(
allowsInlineMediaPlayback: true,
));
@override
void initState() {
super.initState();
pullToRefreshController = PullToRefreshController(
options: PullToRefreshOptions(
color: Colors.blue,
),
onRefresh: () async {
if (Platform.isAndroid) {
webViewController?.reload();
} else if (Platform.isIOS) {
webViewController?.loadUrl(
urlRequest: URLRequest(url: await webViewController?.getUrl()));
}
},
);
}
@override
Widget build(BuildContext context) {
return Scaffold(
floatingActionButton: FloatingActionButton(
onPressed: () {
webViewController?.goBack();
},
child: Icon(Icons.arrow_back),
),
appBar: AppBar(
backgroundColor: Colors.black87,
title: Text(widget.title),
),
body: Center(
child: InAppWebView(
key: webViewKey,
onWebViewCreated: (controller) {
webViewController = controller;
_loadHtmlFromAssets();
},
onUpdateVisitedHistory: (controller, url, androidIsReload) {
if (url!.host.contains("google.com")) {
webViewController?.goBack();
//You can do anything
Navigator.push(
context,
MaterialPageRoute(builder: (context) => const Screen1()),
);
//Prevent that url works
return;
} else if (url.host.contains("yahoo.com")) {
//You can do anything
webViewController?.goBack();
Navigator.push(
context,
MaterialPageRoute(builder: (context) => const Screen3()),
);
//Prevent that url works
return;
} else if (url.host.contains("duckduckgo.com")) {
//You can do anything
webViewController?.goBack();
Navigator.push(
context,
MaterialPageRoute(builder: (context) => const Screen2()),
);
}
}),
));
}
_loadHtmlFromAssets() {
var fileText =
"<!DOCTYPE html> <html> <head> <title>HTML, CSS and JavaScript demo</title> <style> .rotate { transform: rotate(1700deg) ; } .rotate2 { transform: rotate(90deg) ; } .bg { background: url(https://picsum.photos/2000/1000?image=1069) center/cover; height: 50vh; width: 50vh; } body { margin:0; overflow:hidden; } </style> </head> "
"<!-- Start your code here --> <ul> <li> <a href ='http://duckduckgo.com/' /><p> duckduckgo.com</a> </li> <li> <a href='http://www.google.com'>google.com </a> </li> <li> <a href='http://www.yahoo.com/'> yahoo.com </a> </li></ul> </html>";
// return Uri.dataFromString(fileText,
// mimeType: 'text/html', encoding: Encoding.getByName('utf-8'))
// .toString();
webViewController!.loadUrl(
urlRequest: URLRequest(
url: new Uri.dataFromString(fileText, mimeType: 'text/html')));
// _controller?.loadUrl(Uri.dataFromString(fileText,
// mimeType: 'text/html', encoding: Encoding.getByName('utf-8'))
// .toString());
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key, required this.title}) : super(key: key);
final String title;
@override
State<MyHomePage> createState() => _MyHomePageState();
}
class Screen1 extends StatelessWidget {
const Screen1({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: Container(
child: Text("Screen 1 google.com"),
),
);
}
}
class Screen2 extends StatelessWidget {
const Screen2({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: MaterialApp(
home: Container(
child: Text("Screen 2 yahoo.com"),
),
),
);
}
}
class Screen3 extends StatelessWidget {
const Screen3({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: Container(
child: Text("Screen 3 duck.com"),
),
);
}
}
在小部件中禁用导航Webview：
我们可以navigationDelegate用来监控 .url 中的 url 变化webview。NavigationDecision.prevent将阻止跳转到网站
WebView(
// initialUrl: 'https://flutter.dev',
onWebViewCreated: (WebViewController webViewController) {
_controller = webViewController;
_loadHtmlFromAssets();
},
navigationDelegate: (NavigationRequest request) {
if (request.url.contains("google.com")) {
//You can do anything
Navigator.push(
context,
MaterialPageRoute(builder: (context) => const Screen1()),
);
//Prevent that url works
return NavigationDecision.prevent;
} else if (request.url.contains("yahoo.com")) {
//You can do anything
Navigator.push(
context,
MaterialPageRoute(builder: (context) => const Screen1()),
);
//Prevent that url works
return NavigationDecision.prevent;
} else if (request.url.contains("duckduckgo.com")) {
//You can do anything
Navigator.push(
context,
MaterialPageRoute(builder: (context) => const Screen3()),
);
//Prevent that url works
return NavigationDecision.prevent;
}
//Any other url works
return NavigationDecision.navigate;
},
);
于 2022-02-13T13:38:18.367 回答
0
您可以通过如下导航委托属性阻止在 webview 中导航：
WebView(
debuggingEnabled: true,
initialUrl: _currentURL,
onWebViewCreated: (controller) {
_controller = controller;
return _controller;
},
onPageFinished: (url) {
if (url.contains(ConstUtils.course)) {
updateProfile();
}
},
navigationDelegate: (navigation) => NavigationDecision.prevent,
onWebResourceError: (error) {
NavigationUtils(context).popCurrentPage();
},
onPageStarted: (url) {
},
javascriptMode: JavascriptMode.unrestricted,
),
于 2021-01-04T05:28:49.747 回答