[iOS] Fix Scrollbar does not align with FlowDirection=RightToLeft in WebView and HybridWebView

src/Core/src/Handlers/HybridWebView/HybridWebViewHandler.cs

@@ -83,7 +83,7 @@ public partial class HybridWebViewHandler : IHybridWebViewHandler
 
 		public static IPropertyMapper<IHybridWebView, IHybridWebViewHandler> Mapper = new PropertyMapper<IHybridWebView, IHybridWebViewHandler>(ViewHandler.ViewMapper)
 		{
-#if WINDOWS
+#if WINDOWS || IOS || MACCATALYST
 			[nameof(IView.FlowDirection)] = MapFlowDirection,
 #endif
 		};

src/Core/src/Handlers/HybridWebView/HybridWebViewHandler.iOS.cs

@@ -77,6 +77,15 @@ internal static void EvaluateJavaScript(IHybridWebViewHandler handler, IHybridWe
 			handler.PlatformView.EvaluateJavaScript(request);
 		}
 
+		internal static void MapFlowDirection(IHybridWebViewHandler handler, IHybridWebView hybridWebView)
+		{
+			var scrollView = handler.PlatformView?.ScrollView;
+			if (scrollView == null)
+				return;
+
+			scrollView.UpdateFlowDirectionForScrollView(hybridWebView);
+		}
+
 		public static void MapSendRawMessage(IHybridWebViewHandler handler, IHybridWebView hybridWebView, object? arg)
 		{
 			if (arg is not HybridWebViewRawMessage hybridWebViewRawMessage || handler.PlatformView is not IHybridPlatformWebView hybridPlatformWebView)

src/Core/src/Handlers/WebView/WebViewHandler.cs

@@ -31,7 +31,8 @@ public partial class WebViewHandler : IWebViewHandler
 			[nameof(WebViewClient)] = MapWebViewClient,
 			[nameof(WebChromeClient)] = MapWebChromeClient,
 			[nameof(WebView.Settings)] =  MapWebViewSettings
-#elif __IOS__
+#elif __IOS__ || MACCATALYST
+			[nameof(IWebView.FlowDirection)] = MapFlowDirection,
 			[nameof(WKUIDelegate)] = MapWKUIDelegate,
 			[nameof(IWebView.Background)] = MapBackground,
 #endif

src/Core/src/Handlers/WebView/WebViewHandler.iOS.cs

@@ -64,6 +64,15 @@ public static void MapGoForward(IWebViewHandler handler, IWebView webView, objec
 			handler.PlatformView?.UpdateGoForward(webView);
 		}
 
+		internal static void MapFlowDirection(IWebViewHandler handler, IWebView webView)
+		{
+			var scrollView = handler.PlatformView?.ScrollView;
+			if (scrollView == null)
+				return;
+
+			scrollView.UpdateFlowDirectionForScrollView(webView);
+		}
+
 		public static async void MapReload(IWebViewHandler handler, IWebView webView, object? arg)
 		{
 			var platformHandler = handler as WebViewHandler;

src/Core/src/Platform/iOS/WebViewExtensions.cs

@@ -64,6 +64,29 @@ internal static void UpdateCanGoBackForward(this WKWebView platformWebView, IWeb
 			webView.CanGoForward = platformWebView.CanGoForward;
 		}
 
+		internal static void UpdateFlowDirectionForScrollView(this UIKit.UIScrollView scrollView, IView view)
+		{
+			scrollView.UpdateFlowDirection(view);
+
+			// On macOS, we need to refresh the scroll indicators when flow direction changes
+			// But only for runtime changes, not during initial load
+			// The view.IsLoadedOnPlatform() check ensures that this code is executed
+			// only after the view has been loaded on the platform. During the initial load,
+			// the scroll indicators do not need to be refreshed as they are set up correctly
+			// by default. This avoids unnecessary operations during the initial load phase.
+			if (OperatingSystem.IsMacCatalyst() && view.IsLoadedOnPlatform())
+			{
+				bool showsVertical = scrollView.ShowsVerticalScrollIndicator;
+				bool showsHorizontal = scrollView.ShowsHorizontalScrollIndicator;
+
+				scrollView.ShowsVerticalScrollIndicator = false;
+				scrollView.ShowsHorizontalScrollIndicator = false;
+
+				scrollView.ShowsVerticalScrollIndicator = showsVertical;
+				scrollView.ShowsHorizontalScrollIndicator = showsHorizontal;
+			}
+		}
+
 		public static void Eval(this WKWebView platformWebView, IWebView webView, string script)
 		{
 			platformWebView.EvaluateJavaScriptAsync(script);