Xamarin WKWebView和Cookies

我有一个Xamarin表单应用程序，它使用Cookie跟踪登录状态，并同时使用HTTPRequests和WebView，因此两者都需要共享Cookie。在UIWebView中，这些cookies是在我没有任何额外管理的情况下共享的；对于WKWebView，情况似乎并非如此。我一直在寻找关于如何使用WKWebView处理cookie的解释，或者如何手动检索和设置这两个对象之间的cookie的示例，但一直找不到任何解释。如何获得将UIWebView与WKWebView一起使用时所依赖的cookie行为？

您可以创建自定义WKNavigationDelegate

public class MyCustomWebViewDelegate : WKNavigationDelegate
{
    public override void DecidePolicy(WKWebView webView, WKNavigationAction navigationAction, Action<WKNavigationActionPolicy> decisionHandler)
    {
        var jCookies = Appl.FlurlClient.Cookies.Values;
        NSHttpCookie[] nsHttpCookies = jCookies.Where(c => c != null).Select(c => new NSHttpCookie(c)).ToArray();

        foreach (var c in nsHttpCookies)
        {
            webView.Configuration.WebsiteDataStore.HttpCookieStore.SetCookie(c);
        }
        decisionHandler(WKNavigationActionPolicy.Allow);
    }
}

---

从

WKWebview

获取cookie与iOS 12上的不同。您可以通过调用WKNavigationDelegate中的方法来尝试获取cookie

public class NavigationDelegate : WKNavigationDelegate
{
    NSMutableArray multiCookieArr = new NSMutableArray();

public override void DecidePolicy(WKWebView webView, WKNavigationResponse navigationResponse, [BlockProxy(typeof(Action))]Action<WKNavigationResponsePolicy> decisionHandler)
{

    if (UIDevice.CurrentDevice.CheckSystemVersion(12, 0))
    {
        WKHttpCookieStore wKHttpCookieStore = webView.Configuration.WebsiteDataStore.HttpCookieStore;
        Console.WriteLine("wKHttpCookieStore is :" + wKHttpCookieStore.GetDebugDescription());
        wKHttpCookieStore.GetAllCookies(cookies => {
            if(cookies.Length > 0)
            {
                foreach (NSHttpCookie cookie in cookies)
                {
                    //NSHttpCookieStorage.SharedStorage.SetCookie(cookie);
                    Console.WriteLine("cookie is :" + cookie);
                }

            }
        });
    }
    else
    {
        NSHttpUrlResponse response = navigationResponse.Response as NSHttpUrlResponse;
        NSHttpCookie[] cookiesAll = NSHttpCookie.CookiesWithResponseHeaderFields(response.AllHeaderFields, response.Url);
        foreach (NSHttpCookie cookie in cookiesAll)
        {
            Console.WriteLine("Here is the cookie inside wkwebview is :" + cookie);
            NSArray cookieArr = NSArray.FromObjects(cookie.Name, cookie.Value, cookie.Domain, cookie.Path);
            multiCookieArr.Add(cookieArr);
        }
        Console.WriteLine("cookie is :" + cookiesAll);
    }

    decisionHandler(WKNavigationResponsePolicy.Allow);

    //base.DecidePolicy(webView, navigationResponse, decisionHandler);
}

---

也可以参考此讨论：

当我尝试实现WKNamvigationDelegate时，未调用WebView OnLoadFinished，因此加载完成后我的加载指示器仍保留。最终对我有效的是在iOS CustomWebViewRenderer的构造函数中，我调用此函数清除所有现有cookie，并将所有cookie从HTTP共享存储复制到webview：

protected async void SetCookies()
{
    var dataStore = WKWebsiteDataStore.DefaultDataStore;
    var cookies = NSHttpCookieStorage.SharedStorage.Cookies;
    var oldcookies = await dataStore.HttpCookieStore.GetAllCookiesAsync();
    foreach (var cookie in oldcookies)
    {
        await dataStore.HttpCookieStore.DeleteCookieAsync(cookie);
    }
    foreach (var cookie in cookies)
    {
        await dataStore.HttpCookieStore.SetCookieAsync(cookie);
    }
} 

为了从webview中获取cookie，我在共享代码中提供了一个CustomWebView，它使用OnShoulLoad检测成功登录的指示，然后调用特定于平台的代码。这是为了处理Android cookies而创建的，但现在也适用于iOS。iOS实现清除所有现有的HTTP共享存储cookie，并将cookie从webview复制到共享存储中

public async Task GetCookiesFromWebview()
{
    var dataStore = WKWebsiteDataStore.DefaultDataStore;
    var cookies = await dataStore.HttpCookieStore.GetAllCookiesAsync();
    var oldcookies = NSHttpCookieStorage.SharedStorage.Cookies;
    foreach (var cookie in oldcookies)
    {
        NSHttpCookieStorage.SharedStorage.DeleteCookie(cookie);
    }
    foreach (var cookie in cookies)
    {
        NSHttpCookieStorage.SharedStorage.SetCookie(cookie);
    }
    return;
}

---

嗨，如果你已经解决了这个问题，记得在有时间的时候标记答案。：-）

protected async void SetCookies()
{
    var dataStore = WKWebsiteDataStore.DefaultDataStore;
    var cookies = NSHttpCookieStorage.SharedStorage.Cookies;
    var oldcookies = await dataStore.HttpCookieStore.GetAllCookiesAsync();
    foreach (var cookie in oldcookies)
    {
        await dataStore.HttpCookieStore.DeleteCookieAsync(cookie);
    }
    foreach (var cookie in cookies)
    {
        await dataStore.HttpCookieStore.SetCookieAsync(cookie);
    }
} 

public async Task GetCookiesFromWebview()
{
    var dataStore = WKWebsiteDataStore.DefaultDataStore;
    var cookies = await dataStore.HttpCookieStore.GetAllCookiesAsync();
    var oldcookies = NSHttpCookieStorage.SharedStorage.Cookies;
    foreach (var cookie in oldcookies)
    {
        NSHttpCookieStorage.SharedStorage.DeleteCookie(cookie);
    }
    foreach (var cookie in cookies)
    {
        NSHttpCookieStorage.SharedStorage.SetCookie(cookie);
    }
    return;
}