[iOS] Fix issue loading local files in WebView

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;
+ }
  }
 }