Implement Present for iOS

Ooui/Platform.cs

@@ -1,19 +1,123 @@
 using System;
+using System.Diagnostics;
+using System.Linq;
+using System.Reflection;
 
 namespace Ooui
 {
     static class Platform
     {
-#if __IOS32423__
-        public static void Present (string url, object presenter)
-        {
+		static readonly Assembly iosAssembly;
+		static readonly Type iosUIViewControllerType;
+		static readonly Type iosUIApplicationType;
+		static readonly Type iosUIWebViewType;
+		static readonly Type iosNSUrl;
+		static readonly Type iosNSUrlRequest;
 
-        }
-#else
-        public static void Present (string url, object presenter)
+		static Platform ()
 		{
+			var asms = AppDomain.CurrentDomain.GetAssemblies ().ToDictionary (
+				x => x.GetName().Name);
 
-        }
-#endif
+			asms.TryGetValue ("Xamarin.iOS", out iosAssembly);
+			if (iosAssembly != null) {
+				iosUIViewControllerType = iosAssembly.GetType ("UIKit.UIViewController");
+				iosUIApplicationType = iosAssembly.GetType ("UIKit.UIApplication");
+				iosUIWebViewType = iosAssembly.GetType ("UIKit.UIWebView");
+				iosNSUrl = iosAssembly.GetType ("Foundation.NSUrl");
+				iosNSUrlRequest = iosAssembly.GetType ("Foundation.NSUrlRequest");
+			}
+		}
+
+		public static void OpenBrowser (string url, object presenter)
+		{
+			if (iosAssembly != null) {
+				OpenBrowserOniOS (url, presenter);
+			}
+			else {
+				StartBrowserProcess (url);
+			}
+		}
+
+		static void OpenBrowserOniOS (string url, object presenter)
+		{
+			var presenterType = GetObjectType (presenter);
+
+			//
+			// Find a presenter view controller
+			// 1. Try the given presenter
+			// 2. Find the key window vc
+			// 3. Create a window?
+			//
+			object presenterViewController = null;
+			if (presenter != null && iosUIViewControllerType.IsAssignableFrom (presenterType)) {
+				presenterViewController = presenter;
+			}
+
+			if (presenterViewController == null) {
+				var app = iosUIApplicationType.GetProperty ("SharedApplication").GetValue (null, null);
+				var window = iosUIApplicationType.GetProperty ("KeyWindow").GetValue (app, null);
+				if (window != null) {
+					var rvc = window.GetType ().GetProperty ("RootViewController").GetValue (window, null);
+					if (rvc != null) {
+						var pvc = rvc.GetType ().GetProperty ("PresentedViewController").GetValue (rvc, null);
+						presenterViewController = pvc ?? rvc;
+					}
+				}
+			}
+
+			if (presenterViewController == null) {
+				throw new InvalidOperationException ("Cannot find a view controller from which to present");
+			}
+
+			//
+			// Create the browser
+			//
+			var browserVC = Activator.CreateInstance (iosUIViewControllerType);
+			var browserV = Activator.CreateInstance (iosUIWebViewType);
+
+			var nsUrl = iosNSUrl.GetMethod ("FromString").Invoke (null, new object[] { url });
+			var nsUrlRequest = iosNSUrlRequest.GetMethod ("FromUrl").Invoke (null, new object[] { nsUrl });
+			iosUIWebViewType.GetMethod ("LoadRequest").Invoke (browserV, new object[] { nsUrlRequest });
+			iosUIViewControllerType.GetProperty ("View").SetValue (browserVC, browserV, null);
+
+			var m = iosUIViewControllerType.GetMethod ("PresentViewController");
+
+			Console.WriteLine (presenterViewController);
+			Console.WriteLine (browserVC);
+			m.Invoke (presenterViewController, new object[] { browserVC, false, null });
+		}
+
+		static Type GetObjectType (object o)
+		{
+			var t = typeof (object);
+			if (o is IReflectableType rt) {
+				t = rt.GetTypeInfo ().AsType ();
+			}
+			else if (o != null) {
+				t = o.GetType ();
+			}
+			return t;
+		}
+
+		static Process StartBrowserProcess (string url)
+		{
+			var cmd = url;
+			var args = "";
+
+			var osv = Environment.OSVersion;
+			if (osv.Platform == PlatformID.Unix) {
+				cmd = "open";
+				args = url;
+			}
+
+			// var vs = Environment.GetEnvironmentVariables ();
+			// foreach (System.Collections.DictionaryEntry kv in vs) {
+			//     System.Console.WriteLine($"K={kv.Key}, V={kv.Value}");
+			// }
+
+			Console.WriteLine ($"Process.Start {cmd} {args}");
+			return Process.Start (cmd, args);
+		}
     }
 }

Ooui/UI.cs

@@ -95,28 +95,7 @@ namespace Ooui
             var localHost = host == "*" ? "localhost" : host;
             var url = $"http://{localHost}:{port}{path}";
             Console.WriteLine ($"PRESENT {url}");
-
-            var cmd = url;
-            var args = "";
-
-            var osv = Environment.OSVersion;
-            if (osv.Platform == PlatformID.Unix) {
-                cmd = "open";
-                args = url;
-            }
-
-            // var vs = Environment.GetEnvironmentVariables ();
-            // foreach (System.Collections.DictionaryEntry kv in vs) {
-            //     System.Console.WriteLine($"K={kv.Key}, V={kv.Value}");
-            // }
-
-            Console.WriteLine ($"EXEC {cmd} {args}");
-            try {
-                System.Diagnostics.Process.Start (cmd, args);
-            }
-            catch (Exception ex) {
-                Error ("FAILED TO EXEC", ex);
-            }
+			Platform.OpenBrowser (url, presenter);
 		}
 
         static void Start ()

PlatformTests/iOSTests/PresentTests.cs

@@ -10,7 +10,7 @@ namespace iOSTests
 		[TestCase]
 		public void Present ()
 		{
-			var b = new Button ();
+			var b = new Button ("Click Me");
 			UI.Publish ("/b", b);
 			UI.Present ("/b");
 		}

PlatformTests/iOSTests/iOSTests.csproj

@@ -201,6 +201,9 @@
     <Compile Include="..\..\Tests\UITests.cs">
       <Link>Tests\UITests.cs</Link>
     </Compile>
+    <Compile Include="..\..\Ooui\Platform.cs">
+      <Link>Ooui\Platform.cs</Link>
+    </Compile>
   </ItemGroup>
   <ItemGroup>
     <EmbeddedResource Include="..\..\Ooui\Client.js">