使用cookieJs与常规的cookie插入方法结合，可以解决在前端设置cookie的问题：
CookieJs：
!function(e){var n;if("function"==typeof define&&define.amd&&(define(e),n=!0),"object"==typeof exports&&(module.exports=e(),n=!0),!n){var t=window.Cookies,o=window.Cookies=e();o.noConflict=function(){return window.Cookies=t,o}}}(function(){function e(){for(var e=0,n={};e<arguments.length;e++){var t=arguments[e];for(var o in t)n[o]=t[o]}return n}function n(e){return e.replace(/(%[0-9A-Z]{2})+/g,decodeURIComponent)}return function t(o){function r(){}function i(n,t,i){if("undefined"!=typeof document){"number"==typeof(i=e({path:"/"},r.defaults,i)).expires&&(i.expires=new Date(1*new Date+864e5*i.expires)),i.expires=i.expires?i.expires.toUTCString():"";try{var c=JSON.stringify(t);/^[{[]/.test(c)&&(t=c)}catch(e){}t=o.write?o.write(t,n):encodeURIComponent(String(t)).replace(/%(23|24|26|2B|3A|3C|3E|3D|2F|3F|40|5B|5D|5E|60|7B|7D|7C)/g,decodeURIComponent),n=encodeURIComponent(String(n)).replace(/%(23|24|26|2B|5E|60|7C)/g,decodeURIComponent).replace(/[()]/g,escape);var f="";for(var u in i)i[u]&&(f+="; "+u,!0!==i[u]&&(f+="="+i[u].split(";")[0]));return document.cookie=n+"="+t+f}}function c(e,t){if("undefined"!=typeof document){for(var r={},i=document.cookie?document.cookie.split("; "):[],c=0;c<i.length;c++){var f=i[c].split("="),u=f.slice(1).join("=");t||'"'!==u.charAt(0)||(u=u.slice(1,-1));try{var a=n(f[0]);if(u=(o.read||o)(u,a)||n(u),t)try{u=JSON.parse(u)}catch(e){}if(r[a]=u,e===a)break}catch(e){}}return e?r[e]:r}}return r.set=i,r.get=function(e){return c(e,!1)},r.getJSON=function(e){return c(e,!0)},r.remove=function(n,t){i(n,"",e(t,{expires:-1}))},r.defaults={},r.withConverter=t,r}(function(){})});
示例：
iOS 渲染器：
public class DefaultWebViewRenderer : ViewRenderer<CustomWebView, WKWebView>, IWKScriptMessageHandler, IWKNavigationDelegate
{
const string JavaScriptFunction = "function invokeCSharpAction(data){window.webkit.messageHandlers.invokeAction.postMessage(data);}";
const string cookieJs = "!function(e){var n;if(\"function\"==typeof define&&define.amd&&(define(e),n=!0),\"object\"==typeof exports&&(module.exports=e(),n=!0),!n){var t=window.Cookies,o=window.Cookies=e();o.noConflict=function(){return window.Cookies=t,o}}}(function(){function e(){for(var e=0,n={};e<arguments.length;e++){var t=arguments[e];for(var o in t)n[o]=t[o]}return n}function n(e){return e.replace(/(%[0-9A-Z]{2})+/g,decodeURIComponent)}return function t(o){function r(){}function i(n,t,i){if(\"undefined\"!=typeof document){\"number\"==typeof(i=e({path:\"/\"},r.defaults,i)).expires&&(i.expires=new Date(1*new Date+864e5*i.expires)),i.expires=i.expires?i.expires.toUTCString():\"\";try{var c=JSON.stringify(t);/^[\\{\\[]/.test(c)&&(t=c)}catch(e){}t=o.write?o.write(t,n):encodeURIComponent(String(t)).replace(/%(23|24|26|2B|3A|3C|3E|3D|2F|3F|40|5B|5D|5E|60|7B|7D|7C)/g,decodeURIComponent),n=encodeURIComponent(String(n)).replace(/%(23|24|26|2B|5E|60|7C)/g,decodeURIComponent).replace(/[\\(\\)]/g,escape);var f=\"\";for(var u in i)i[u]&&(f+=\"; \"+u,!0!==i[u]&&(f+=\"=\"+i[u].split(\";\")[0]));return document.cookie=n+\"=\"+t+f}}function c(e,t){if(\"undefined\"!=typeof document){for(var r={},i=document.cookie?document.cookie.split(\"; \"):[],c=0;c<i.length;c++){var f=i[c].split(\"=\"),u=f.slice(1).join(\"=\");t||'\"'!==u.charAt(0)||(u=u.slice(1,-1));try{var a=n(f[0]);if(u=(o.read||o)(u,a)||n(u),t)try{u=JSON.parse(u)}catch(e){}if(r[a]=u,e===a)break}catch(e){}}return e?r[e]:r}}return r.set=i,r.get=function(e){return c(e,!1)},r.getJSON=function(e){return c(e,!0)},r.remove=function(n,t){i(n,\"\",e(t,{expires:-1}))},r.defaults={},r.withConverter=t,r}(function(){})});";
WKUserContentController userController;
public DefaultWebViewRenderer()
{
}
protected override void OnElementChanged(ElementChangedEventArgs<CustomWebView> e)
{
base.OnElementChanged(e);
if (Control == null && e.OldElement == null)
{
userController = new WKUserContentController();
var cookieValue = string.Empty;
var jsScript = new WKUserScript(new NSString(cookieJs), WKUserScriptInjectionTime.AtDocumentStart, false);
var yourCookie = new WKUserScript(new NSString("Cookies.set('CookieKey','" + cookieValue + "',{expires : 30, domain : '.yourdomain.com' })"), WKUserScriptInjectionTime.AtDocumentStart, false);
userController.AddUserScript(jsScript);
userController.AddUserScript(yourCookie);
var script = new WKUserScript(new NSString(JavaScriptFunction), WKUserScriptInjectionTime.AtDocumentEnd, false);
userController.AddUserScript(script);
userController.AddScriptMessageHandler(this, "invokeAction");
var config = new WKWebViewConfiguration { UserContentController = userController };
var webView = new WKWebView(Frame, config);
SetNativeControl(webView);
}
if (e.OldElement != null)
{
userController.RemoveAllUserScripts();
userController.RemoveScriptMessageHandler("invokeAction");
}
if (e.NewElement != null)
{
if (Element.Source is UrlWebViewSource urlSource)
{
var url = new NSUrl(urlSource.Url);
var storage = NSHttpCookieStorage.SharedStorage;
storage.AcceptPolicy = NSHttpCookieAcceptPolicy.Always;
var request = new NSMutableUrlRequest(url);
Control.LoadRequest(request);
}
else if (Element.Source is HtmlWebViewSource htmlSource)
{
Control.LoadHtmlString(htmlSource.Html, null);
}
}
}
public void DidReceiveScriptMessage(WKUserContentController userContentController, WKScriptMessage message)
{
Element.JavascriptBridgeInvoked(message.Body.ToString());
}
}
Android 渲染器：
public class DefaultWebViewRenderer : WebViewRenderer
{
const string JavaScriptFunction = "function invokeCSharpAction(data){jsBridge.invokeAction(data);}";
public DefaultWebViewRenderer(Context context) : base(context)
{
}
protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.WebView> e)
{
base.OnElementChanged(e);
if (Control != null && e.NewElement is CustomWebView webView)
{
Control.SetWebViewClient(new WebViewTestClient());
Control.ClearSslPreferences();
Control.Settings.SetAppCacheEnabled(false);
Control.Settings.DatabaseEnabled = true;
Control.Settings.DomStorageEnabled = true;
Control.Settings.AllowFileAccessFromFileURLs = true;
Control.Settings.AllowUniversalAccessFromFileURLs = true;
Control.Settings.CacheMode = Android.Webkit.CacheModes.NoCache;
Control.Settings.AllowContentAccess = true;
Control.Settings.AllowFileAccess = true;
Control.Settings.JavaScriptEnabled = true;
Control.Settings.JavaScriptCanOpenWindowsAutomatically = true;
var cookieManager = CookieManager.Instance;
cookieManager.SetAcceptCookie(true);
cookieManager.SetAcceptThirdPartyCookies(Control, true);
try
{
Control.SetDownloadListener(new DownloadListener());
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
if (e.OldElement != null)
{
Control.RemoveJavascriptInterface("jsBridge");
}
Control.AddJavascriptInterface(new JSBridge(this), "jsBridge");
InjectJS(JavaScriptFunction);
if (webView.Source is UrlWebViewSource webSource)
{
Control.LoadUrl(webSource.Url);
}
}
}
private void InjectJS(string script)
{
if (Control != null)
{
Control.LoadUrl(string.Format("javascript: {0}", script));
}
}
}
public class WebViewTestClient : WebViewClient
{
public override void OnPageStarted(Android.Webkit.WebView view, string url, Bitmap favicon)
{
var cookieJs = "!function(e){var n;if(\"function\"==typeof define&&define.amd&&(define(e),n=!0),\"object\"==typeof exports&&(module.exports=e(),n=!0),!n){var t=window.Cookies,o=window.Cookies=e();o.noConflict=function(){return window.Cookies=t,o}}}(function(){function e(){for(var e=0,n={};e<arguments.length;e++){var t=arguments[e];for(var o in t)n[o]=t[o]}return n}function n(e){return e.replace(/(%[0-9A-Z]{2})+/g,decodeURIComponent)}return function t(o){function r(){}function i(n,t,i){if(\"undefined\"!=typeof document){\"number\"==typeof(i=e({path:\"/\"},r.defaults,i)).expires&&(i.expires=new Date(1*new Date+864e5*i.expires)),i.expires=i.expires?i.expires.toUTCString():\"\";try{var c=JSON.stringify(t);/^[\\{\\[]/.test(c)&&(t=c)}catch(e){}t=o.write?o.write(t,n):encodeURIComponent(String(t)).replace(/%(23|24|26|2B|3A|3C|3E|3D|2F|3F|40|5B|5D|5E|60|7B|7D|7C)/g,decodeURIComponent),n=encodeURIComponent(String(n)).replace(/%(23|24|26|2B|5E|60|7C)/g,decodeURIComponent).replace(/[\\(\\)]/g,escape);var f=\"\";for(var u in i)i[u]&&(f+=\"; \"+u,!0!==i[u]&&(f+=\"=\"+i[u].split(\";\")[0]));return document.cookie=n+\"=\"+t+f}}function c(e,t){if(\"undefined\"!=typeof document){for(var r={},i=document.cookie?document.cookie.split(\"; \"):[],c=0;c<i.length;c++){var f=i[c].split(\"=\"),u=f.slice(1).join(\"=\");t||'\"'!==u.charAt(0)||(u=u.slice(1,-1));try{var a=n(f[0]);if(u=(o.read||o)(u,a)||n(u),t)try{u=JSON.parse(u)}catch(e){}if(r[a]=u,e===a)break}catch(e){}}return e?r[e]:r}}return r.set=i,r.get=function(e){return c(e,!1)},r.getJSON=function(e){return c(e,!0)},r.remove=function(n,t){i(n,\"\",e(t,{expires:-1}))},r.defaults={},r.withConverter=t,r}(function(){})});";
var cookieValue = string.Empty;
view.EvaluateJavascript(cookieJs, null);
view.EvaluateJavascript("Cookies.set('CookieKey','" + cookieValue + "',{expires : 30, domain : '.yourdomain.com' })", null);
base.OnPageStarted(view, url, favicon);
view.ClearCache(true);
}
public override void OnPageFinished(Android.Webkit.WebView view, string url)
{
base.OnPageFinished(view, url);
view.ClearCache(true);
}
public override void OnReceivedSslError(Android.Webkit.WebView view, SslErrorHandler handler, SslError error)
{
handler.Proceed();
base.OnReceivedSslError(view, handler, error);
}
}
public class DownloadListener : Java.Lang.Object, Android.Webkit.IDownloadListener
{
public DownloadListener()
{
}
public void OnDownloadStart(string url, string userAgent, string contentDisposition, string mimetype, long contentLength)
{
if (string.IsNullOrEmpty(url) || !Uri.TryCreate(url, UriKind.RelativeOrAbsolute, out _))
return;
try
{
if (HasPermissions())
{
Android.Net.Uri contentUri = Android.Net.Uri.Parse(url);
DownloadManager.Request request = new DownloadManager.Request(contentUri);
request.SetMimeType(mimetype);
var cookies = Android.Webkit.CookieManager.Instance.GetCookie(url);
request.AddRequestHeader("cookie", cookies);
request.AddRequestHeader("User-Agent", userAgent);
request.SetDescription("Downloading file...");
request.SetTitle(Android.Webkit.URLUtil.GuessFileName(url, contentDisposition, mimetype));
request.AllowScanningByMediaScanner();
request.SetNotificationVisibility(Android.App.DownloadVisibility.VisibleNotifyCompleted);
request.SetDestinationInExternalPublicDir(Android.OS.Environment.DirectoryDownloads, ".pdf");
Android.App.DownloadManager dm = (Android.App.DownloadManager)CrossCurrentActivity.Current.Activity.GetSystemService(Android.Content.Context.DownloadService);
dm.Enqueue(request);
}
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}
private static bool HasPermissions()
{
if (Android.OS.Build.VERSION.SdkInt >= Android.OS.BuildVersionCodes.M)
{
string[] WriteLocation =
{
Android.Manifest.Permission.WriteExternalStorage,
Android.Manifest.Permission.ReadExternalStorage
};
var perm = CrossCurrentActivity.Current.AppContext.CheckSelfPermission(Android.Manifest.Permission.WriteExternalStorage);
if (perm != (int)Android.Content.PM.Permission.Granted)
{
CrossCurrentActivity.Current.Activity.RequestPermissions(WriteLocation, 2);
return false;
}
else
{
return true;
}
}
else
{
return true;
}
}
}
public class JSBridge : Java.Lang.Object
{
private readonly WeakReference<DefaultWebViewRenderer> hybridWebViewRenderer;
public JSBridge(DefaultWebViewRenderer hybridRenderer)
{
hybridWebViewRenderer = new WeakReference<DefaultWebViewRenderer>(hybridRenderer);
}
[JavascriptInterface]
[Export("invokeAction")]
public void InvokeAction(string data)
{
if (hybridWebViewRenderer != null && hybridWebViewRenderer.TryGetTarget(out DefaultWebViewRenderer hybridRenderer) && hybridRenderer != null && hybridRenderer.Element is CustomWebView webView)
{
webView.JavascriptBridgeInvoked(data);
}
}
}
