Merge pull request #12075 from unoplatform/dev/jela/hotreload-update

fix(hr): Adjust Page reload for custom frame presenter

src/Uno.UI.RemoteControl/HotReload/ClientHotReloadProcessor.Xaml.cs

@@ -206,6 +206,19 @@ namespace Uno.UI.RemoteControl.HotReload
 			{
 				parentAsContentControl.Content = newView;
 			}
+			else if (newView is Page newPage && oldView is Page oldPage)
+			{
+				// In the case of Page, swapping the actual page is not supported, so we
+				// need to swap the content of the page instead. This can happen if the Frame
+				// is using a native presenter which does not use the `Frame.Content` property.
+
+				// Clear any local context, so that the new page can inherit the value coming
+				// from the parent Frame. It may happen if the old page set it explicitly.
+				oldPage.ClearValue(Page.DataContextProperty, DependencyPropertyValuePrecedences.Local);
+
+				oldPage.Content = newPage;
+				newPage.Frame = oldPage.Frame;
+			}
 			else
 			{
 				VisualTreeHelper.SwapViews(oldView, newView);

src/Uno.UI/UI/Xaml/Application.Components.cs

 using System;
 using System.Collections.Generic;
 using Windows.UI.Xaml.Markup;
+using Uno.Foundation.Logging;
 
 namespace Windows.UI.Xaml
 {
@@ -21,6 +22,13 @@ namespace Windows.UI.Xaml
 			{
 				XamlReader.LoadUsingComponent(document, component);
 			}
+			else
+			{
+				if (typeof(Application).Log().IsEnabled(LogLevel.Debug))
+				{
+					typeof(Application).Log().LogDebug($"Skipping component load, could not find registration for {resourceLocator}");
+				}
+			}
 		}
 
 		internal static void RegisterComponent(Uri resourceLocator, string xaml)

src/Uno.UI/UI/Xaml/Media/VisualTreeHelper.iOSmacOS.cs

@@ -3,6 +3,8 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using Uno.Foundation.Logging;
+
 #if __IOS__
 using UIKit;
 using _View = UIKit.UIView;
@@ -31,6 +33,13 @@ namespace Windows.UI.Xaml.Media
 				currentSuperview?.AddSubview(newView, NSWindowOrderingMode.Above, currentSuperview.Subviews[Math.Max(0, currentPosition - 1)]);
 #endif
 			}
+			else
+			{
+				if (typeof(VisualTreeHelper).Log().IsEnabled(LogLevel.Debug))
+				{
+					typeof(VisualTreeHelper).Log().LogDebug($"Unable to swap view, could not find old view's position.");
+				}
+			}
 		}
 	}
 }