feature: support iOS login

Pixiview.iOS/Pixiview.iOS.csproj

@@ -83,6 +83,7 @@
     <Compile Include="Renderers\OptionEntryRenderer.cs" />
     <Compile Include="Renderers\AppShellSection\AppAppearanceTracker.cs" />
     <Compile Include="Renderers\BlurryPanelRenderer.cs" />
+    <Compile Include="Renderers\HybridWebViewRenderer.cs" />
   </ItemGroup>
   <ItemGroup>
     <InterfaceDefinition Include="Resources\LaunchScreen.storyboard" />

Pixiview.iOS/Renderers/HybridWebViewRenderer.cs

@@ -0,0 +1,80 @@
+using System;
+using Foundation;
+using Pixiview.iOS.Renderers;
+using Pixiview.Login;
+using Pixiview.Utils;
+using WebKit;
+using Xamarin.Forms;
+using Xamarin.Forms.Platform.iOS;
+
+[assembly: ExportRenderer(typeof(HybridWebView), typeof(HybridWebViewRenderer))]
+namespace Pixiview.iOS.Renderers
+{
+    public class HybridWebViewRenderer : WkWebViewRenderer
+    {
+        public HybridWebViewRenderer() : this(new WKWebViewConfiguration())
+        {
+        }
+
+        public HybridWebViewRenderer(WKWebViewConfiguration config) : base(config)
+        {
+        }
+
+        protected override void OnElementChanged(VisualElementChangedEventArgs e)
+        {
+            base.OnElementChanged(e);
+
+            if (e.NewElement is HybridWebView webView)
+            {
+                string url = webView.Uri;
+                //Configuration.SetUrlSchemeHandler
+                CustomUserAgent = webView.UserAgent;
+                NavigationDelegate = new PixivNavigationDelegate(webView);
+
+                LoadRequest(new NSUrlRequest(NSUrl.FromString(url)));
+            }
+        }
+
+        private class PixivNavigationDelegate : WKNavigationDelegate
+        {
+            private readonly HybridWebView hybridWebView;
+
+            public PixivNavigationDelegate(HybridWebView hybrid)
+            {
+                hybridWebView = hybrid;
+            }
+
+            public override void DecidePolicy(WKWebView webView, WKNavigationResponse navigationResponse, Action<WKNavigationResponsePolicy> decisionHandler)
+            {
+                var url = webView.Url;
+                if (url.Host == "www.pixiv.net" && url.Path == "/")
+                {
+                    if (navigationResponse.Response is NSHttpUrlResponse response)
+                    {
+                        if (response.AllHeaderFields.TryGetValue(new NSString("x-userid"), out var val))
+                        {
+                            Configs.SetUserId(val.ToString(), true);
+                        }
+                    }
+                }
+
+                decisionHandler(WKNavigationResponsePolicy.Allow);
+            }
+
+            public override async void DidFinishNavigation(WKWebView webView, WKNavigation navigation)
+            {
+                var url = webView.Url;
+                if (url.Host == "www.pixiv.net" && url.Path == "/")
+                {
+                    var store = webView.Configuration.WebsiteDataStore.HttpCookieStore;
+                    var result = await Configs.RequestCookieContainer(store);
+
+                    if (result && hybridWebView != null)
+                    {
+                        hybridWebView.OnLoginHandle();
+                    }
+                }
+            }
+        }
+    }
+}