Fix issue loading local files in iOS WebView (#10804)

src/Core/src/Platform/iOS/MauiWKWebView.cs

@@ -1,10 +1,12 @@
 using System;
 using System.Drawing;
+using System.IO;
 using System.Threading.Tasks;
 using CoreGraphics;
 using Foundation;
 using UIKit;
 using WebKit;
+using Microsoft.Extensions.Logging;
 
 namespace Microsoft.Maui.Platform
 {
@@ -89,13 +91,36 @@ public void LoadHtml(string? html, string? baseUrl)
 		}
 
 		public void LoadUrl(string? url)
-		{
-			var uri = new Uri(url ?? string.Empty);
-			var safeHostUri = new Uri($"{uri.Scheme}://{uri.Authority}", UriKind.Absolute);
-			var safeRelativeUri = new Uri($"{uri.PathAndQuery}{uri.Fragment}", UriKind.Relative);
-			NSUrlRequest request = new NSUrlRequest(new NSUrl(new Uri(safeHostUri, safeRelativeUri).AbsoluteUri));
+		{	
+			try
+			{
+				var uri = new Uri(url ?? string.Empty);
+				var safeHostUri = new Uri($"{uri.Scheme}://{uri.Authority}", UriKind.Absolute);
+				var safeRelativeUri = new Uri($"{uri.PathAndQuery}{uri.Fragment}", UriKind.Relative);
+				NSUrlRequest request = new NSUrlRequest(new NSUrl(new Uri(safeHostUri, safeRelativeUri).AbsoluteUri));
 
-			LoadRequest(request);
+				LoadRequest(request);
+			}
+			catch (UriFormatException formatException)
+			{
+				// If we got a format exception trying to parse the URI, it might be because
+				// someone is passing in a local bundled file page. If we can find a better way
+				// to detect that scenario, we should use it; until then, we'll fall back to 
+				// local file loading here and see if that works:
+				if(!string.IsNullOrEmpty(url))
+				{
+					if (!LoadFile(url))
+					{
+						if (_handler.TryGetTarget(out var handler))
+							handler.MauiContext?.CreateLogger<MauiWKWebView>()?.LogWarning(nameof(MauiWKWebView), $"Unable to Load Url {url}: {formatException}");
+					}
+				}
+			}
+			catch (Exception exc)
+			{
+				if (_handler.TryGetTarget(out var handler))
+					handler.MauiContext?.CreateLogger<MauiWKWebView>()?.LogWarning(nameof(MauiWKWebView), $"Unable to Load Url {url}: {exc}");
+			}
 		}
 
 		// https://developer.apple.com/forums/thread/99674
@@ -114,5 +139,32 @@ public static WKWebViewConfiguration CreateConfiguration()
 
 			return config;
 		}
+
+		bool LoadFile(string url)
+		{
+			try
+			{
+				var file = Path.GetFileNameWithoutExtension(url);
+				var ext = Path.GetExtension(url);
+
+				var nsUrl = NSBundle.MainBundle.GetUrlForResource(file, ext);
+
+				if (nsUrl == null)
+				{
+					return false;
+				}
+
+				LoadFileUrl(nsUrl, nsUrl);
+
+				return true;
+			}
+			catch (Exception ex)
+			{
+				if (_handler.TryGetTarget(out var handler))
+					handler.MauiContext?.CreateLogger<MauiWKWebView>()?.LogWarning(nameof(MauiWKWebView), $"Could not load {url} as local file: {ex}");
+			}
+
+			return false;
+		}
 	}
 }