Xamarin set Cookies in Multiplatform iOS app using (Hybrid)WebView

Question

Xamarin set Cookies in Multiplatform iOS app using (Hybrid)WebView

bags 1

I followed example from here (https://learn.microsoft.com/en-gb/xamarin/xamarin-forms/app-fundamentals/custom-renderer/hybridwebview#invoke-c-from-javascript) to setup WebView for my project and I can invoke C# code from WebView page event, that is working fine.
However, before sending a request I have to setup a Cookie and that cookie should be passed to remote server. I followed several examples from net I am getting it to work for Android but iOS its not working.

Code I got from another Stackoverflow question as follows.

Android Working

   var cookieManager = CookieManager.Instance;  
   cookieManager.SetAcceptCookie(true);  
   cookieManager.RemoveAllCookie();  
   var cookies = UserInfo.CookieContainer.GetCookies(new System.Uri(AppInfo.URL_BASE));  
   for (var i = 0; i < cookies.Count; i++)  
   {  
       string cookieValue = cookies[i].Value;  
       string cookieDomain = cookies[i].Domain;  
       string cookieName = cookies[i].Name;  
       cookieManager.SetCookie(cookieDomain, cookieName + "=" + cookieValue);  
   }

iOS Not Working

   // Set cookies here  
   var cookieUrl = new Uri(AppInfo.URL_BASE);  
   var cookieJar = NSHttpCookieStorage.SharedStorage;  
   cookieJar.AcceptPolicy = NSHttpCookieAcceptPolicy.Always;  
   foreach (var aCookie in cookieJar.Cookies)  
   {  
       cookieJar.DeleteCookie(aCookie);  
   }  
     
   var jCookies = UserInfo.CookieContainer.GetCookies(cookieUrl);  
   IList<NSHttpCookie> eCookies =   
                      (from object jCookie in jCookies   
                       where jCookie != null   
                       select (Cookie) jCookie   
                       into netCookie select new NSHttpCookie(netCookie)).ToList();  
   cookieJar.SetCookies(eCookies.ToArray(), cookieUrl, cookieUrl);

I have tried code from WebView documentation here, Cookie section (https://learn.microsoft.com/en-us/xamarin/xamarin-forms/user-interface/webview?tabs=macos#cookies)

In my HybridWebViewRenderer method I am adding my custom Cookie as follows.

   protected override void OnElementChanged(VisualElementChangedEventArgs e)  
    {  
     
       base.OnElementChanged(e);  
     
       if (e.OldElement != null)  
       {  
           userController.RemoveAllUserScripts();  
           userController.RemoveScriptMessageHandler("invokeAction");  
           HybridWebView hybridWebView = e.OldElement as HybridWebView;  
           hybridWebView.Cleanup();  
       }  
     
       if (e.NewElement != null)  
       {  
           string cookieDomain = new System.Uri(((HybridWebView)Element).Uri).Host;  
     
           foreach (var c in NSHttpCookieStorage.SharedStorage.Cookies)  
           {  
               Console.WriteLine("Cookie (Delete)" + c.Name);  
               NSHttpCookieStorage.SharedStorage.DeleteCookie(c);  
           }  
                 
     
           var cookieDict = new NSMutableDictionary();  
           cookieDict.Add(NSHttpCookie.KeyDomain, new NSString("." + cookieDomain));  
           cookieDict.Add(NSHttpCookie.KeyName, new NSString("ABC"));  
           cookieDict.Add(NSHttpCookie.KeyValue, new NSString("123e4567-e89b-12d3-a456-426652340003"));  
           cookieDict.Add(NSHttpCookie.KeyPath, new NSString("/"));  
           cookieDict.Add(NSHttpCookie.KeyExpires, DateTime.Now.AddDays(1).ToNSDate());  
     
           var myCookie = new NSHttpCookie(cookieDict);  
     
           NSHttpCookieStorage.SharedStorage.SetCookie(myCookie);  
     
           string filename = $"{hybridView.Uri}";  
     
           var request = new NSMutableUrlRequest(new NSUrl(filename));  
     
           var wkNavigation = LoadRequest(request);  
       }  
    }

In AppDelegate I have added.

   public override bool FinishedLaunching(UIApplication app, NSDictionary options)  
    {  
               global::Xamarin.Forms.Forms.Init();  
               LoadApplication(new App());  
     
               NSHttpCookieStorage.SharedStorage.AcceptPolicy = NSHttpCookieAcceptPolicy.Always;  
     
               return base.FinishedLaunching(app, options);  
     }

Still no luck :( .........

I'll really appreciate if anybody can point out what I am doing wrong any hints.
Thanks.

Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 36,436 Reputation points Microsoft External Staff

2021-11-30T07:46:06.81+00:00

I have tried code from WebView documentation here, Cookie section (https://learn.microsoft.com/en-us/xamarin/xamarin-forms/user-interface/webview?tabs=macos#cookies)

You could set the cookie in WebView (Forms) directly, I test in iOS, it works. And it won't break the Custom Renderers that invoke C# code from WebView page event.

In Safari Develop mode, I check the Cookies under Storage, XamarinCookie is in the list. I'm not clear if there is someting missing , you could share more information about your practice.

Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 36,436 Microsoft External Staff

Xaml

<StackLayout>
        <local:MyWebView x:Name="MyWebview" WidthRequest="400" HeightRequest="500"></local:MyWebView>
        <Button Text="click to load" Clicked="Button_Clicked"></Button>
    </StackLayout>

Code

 private void Button_Clicked(object sender, EventArgs e)
            {
                CookieContainer cookieContainer = new CookieContainer();
                Uri uri = new Uri("https://dotnet.microsoft.com/apps/xamarin", UriKind.RelativeOrAbsolute);

            Cookie cookie = new Cookie
            {
                Name = "XamarinCookie",
                Expires = DateTime.Now.AddDays(1),
                Value = "My cookie",
                Domain = uri.Host,
                Path = "/"
            };
            cookieContainer.Add(uri, cookie);
            MyWebview.Cookies = cookieContainer;
            MyWebview.Source = new UrlWebViewSource { Url = uri.ToString() };
        }

Your answer

Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 36,436 Reputation points Microsoft External Staff

2021-11-30T07:46:06.81+00:00

I have tried code from WebView documentation here, Cookie section (https://learn.microsoft.com/en-us/xamarin/xamarin-forms/user-interface/webview?tabs=macos#cookies)

You could set the cookie in WebView (Forms) directly, I test in iOS, it works. And it won't break the Custom Renderers that invoke C# code from WebView page event.

In Safari Develop mode, I check the Cookies under Storage, XamarinCookie is in the list. I'm not clear if there is someting missing , you could share more information about your practice.
Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 36,436 Reputation points Microsoft External Staff

2021-11-30T07:46:53.51+00:00

Xaml

<StackLayout> <local:MyWebView x:Name="MyWebview" WidthRequest="400" HeightRequest="500"></local:MyWebView> <Button Text="click to load" Clicked="Button_Clicked"></Button> </StackLayout>

Code

private void Button_Clicked(object sender, EventArgs e) { CookieContainer cookieContainer = new CookieContainer(); Uri uri = new Uri("https://dotnet.microsoft.com/apps/xamarin", UriKind.RelativeOrAbsolute); Cookie cookie = new Cookie { Name = "XamarinCookie", Expires = DateTime.Now.AddDays(1), Value = "My cookie", Domain = uri.Host, Path = "/" }; cookieContainer.Add(uri, cookie); MyWebview.Cookies = cookieContainer; MyWebview.Source = new UrlWebViewSource { Url = uri.ToString() }; }

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Xamarin set Cookies in Multiplatform iOS app using (Hybrid)WebView

Your answer