[[ Bug 22816 ]] Fix permissions when loading a local html file

This patch uses the `loadFileURL:allowingReadAccessToURL:` instance method of the WKWebView class to load a local html file. This fixes an issue with insufficient permissions on iOS 12 devices that prevented the html file from being loaded.
livecode · Jul 23, 2020 · 86b3a36 · 86b3a36
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diff --git a/docs/notes/bugfix-22816.md b/docs/notes/bugfix-22816.md
@@ -0,0 +1 @@
+# Fix permissions when loading a local html file on iOS 12
diff --git a/libbrowser/src/libbrowser_wkwebview.mm b/libbrowser/src/libbrowser_wkwebview.mm
@@ -1618,7 +1618,10 @@ - (void) loadRequest:(MCWKWebViewLoadRequest *)request inWebView:(WKWebView *)we
 	MCBrowserRunBlockOnMainFiber(^{
 		if (request.htmlText == nil)
 		{
-			[webView loadRequest:[NSURLRequest requestWithURL:request.url]];
+			if (request.url.host)
+				[webView loadRequest:[NSURLRequest requestWithURL:request.url]];
+			else
+				[webView loadFileURL:request.url allowingReadAccessToURL:request.url];
 		}
 		else
 		{