fix(ios): PersonPicture late binding

src/SamplesApp/UITests.Shared/UITests.Shared.projitems

@@ -2374,6 +2374,10 @@
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
+    <Page Include="$(MSBuildThisFileDirectory)Windows_UI_Xaml_Controls\PersonPictureTests\PersonPictureLateBindingPage.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+    </Page>    
     <Page Include="$(MSBuildThisFileDirectory)Windows_UI_Xaml_Controls\Pivot\Pivot_CustomContent_Automated.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
@@ -7163,6 +7167,9 @@
     <Compile Include="$(MSBuildThisFileDirectory)Windows_UI_Xaml_Controls\PersonPictureTests\PersonPicturePage.xaml.cs">
       <DependentUpon>PersonPicturePage.xaml</DependentUpon>
     </Compile>
+    <Compile Include="$(MSBuildThisFileDirectory)Windows_UI_Xaml_Controls\PersonPictureTests\PersonPictureLateBindingPage.xaml.cs">
+      <DependentUpon>PersonPictureLateBindingPage.xaml</DependentUpon>
+    </Compile>    
     <Compile Include="$(MSBuildThisFileDirectory)Windows_UI_Xaml_Controls\Pivot\Pivot_CustomContent_Automated.xaml.cs">
       <DependentUpon>Pivot_CustomContent_Automated.xaml</DependentUpon>
     </Compile>

src/SamplesApp/UITests.Shared/Windows_UI_Xaml_Controls/PersonPictureTests/PersonPictureLateBindingPage.xaml

@@ -0,0 +1,27 @@
+<!-- Copyright (c) Microsoft Corporation. All rights reserved. Licensed under the MIT License. See LICENSE in the project root for license information. -->
+<UserControl
+    x:Class="MUXControlsTestApp.PersonPictureLateBindingPage"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:MUXControlsTestApp"
+	xmlns:controls="using:Microsoft.UI.Xaml.Controls"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    mc:Ignorable="d">
+
+      <StackPanel HorizontalAlignment="Center"
+		VerticalAlignment="Center"
+		x:Name="m_MainStackPanel"
+		Spacing="16">
+
+		<PersonPicture ProfilePicture="{Binding ImagePath}"
+					Height="100"
+					Width="100"
+					HorizontalAlignment="Center"
+					VerticalAlignment="Center" />
+
+		<TextBlock Text="{Binding LeName}"
+					FontSize="22"
+					HorizontalAlignment="Center"/>
+      </StackPanel>
+</UserControl>

src/SamplesApp/UITests.Shared/Windows_UI_Xaml_Controls/PersonPictureTests/PersonPictureLateBindingPage.xaml.cs

@@ -0,0 +1,40 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License. See LICENSE in the project root for license information.
+
+using System;
+using System.Collections.ObjectModel;
+using MUXControlsTestApp.Utilities;
+using Uno.UI.Samples.Controls;
+using Windows.ApplicationModel.Contacts;
+using System.Threading.Tasks;
+
+namespace MUXControlsTestApp
+{
+	[SampleControlInfo(
+		"MUX",
+		"PersonPictureLateBinding",
+		description: "Shows a PersonPicture control and a Textblock with a name. \n" +
+		"The PersonPicture control image is set after 1 second delay. \n" +
+		"The image should be displayed after the delay.",
+		isManualTest: true)]
+#pragma warning disable UXAML0002 // does not explicitly define the Microsoft.UI.Xaml.Controls.UserControl base type in code behind.
+	public sealed partial class PersonPictureLateBindingPage
+#pragma warning restore UXAML0002 // does not explicitly define the Microsoft.UI.Xaml.Controls.UserControl base type in code behind.
+	{
+		public string ImagePath { get; } = "ms-appx:///Assets/ingredient2.png";
+
+		public string LeName { get; } = "James Bondi";
+
+		public PersonPictureLateBindingPage()
+		{
+			this.InitializeComponent();
+			_ = SetImagePathWithDelay();
+		}
+
+		private async Task SetImagePathWithDelay()
+		{
+			await Task.Delay(1000);
+			DataContext = this;
+		}
+	}
+}

src/Uno.UI/Microsoft/UI/Xaml/Controls/PersonPicture/PersonPicture.cs

@@ -203,23 +203,33 @@ void UpdateIfReady()
 
 		var templateSettings = TemplateSettings;
 		templateSettings.ActualInitials = initials;
-		if (imageSrc != null)
+
+		if (imageSrc is not null)
 		{
-			var imageBrush = templateSettings.ActualImageBrush;
-			if (imageBrush == null)
+			if (templateSettings.ActualImageBrush is ImageBrush imageBrush)
 			{
-				imageBrush = new ImageBrush();
-				imageBrush.Stretch = Stretch.UniformToFill;
-				templateSettings.ActualImageBrush = imageBrush;
+				imageBrush.ImageSource = imageSrc;
+			}
+			else
+			{
+				templateSettings.ActualImageBrush = new ImageBrush()
+				{
+					ImageSource = imageSrc,
+					Stretch = Stretch.UniformToFill
+				};
 			}
-
-			imageBrush.ImageSource = imageSrc;
 		}
 		else
 		{
 			templateSettings.ActualImageBrush = null;
 		}
 
+#if __IOS__
+		if (templateSettings.ActualImageBrush is ImageBrush brush)
+		{
+			brush.ImageOpened += RefreshPhoto;
+		}
+#endif
 		// If the control is converted to 'Group-mode', we'll clear individual-specific information.
 		// When IsGroup evaluates to false, we will restore state.
 		if (IsGroup)
@@ -228,7 +238,11 @@ void UpdateIfReady()
 		}
 		else
 		{
-			if (imageSrc != null)
+			if (imageSrc is not null
+#if __IOS__
+			&& imageSrc.IsOpened
+#endif
+			)
 			{
 				VisualStateManager.GoToState(this, "Photo", false);
 			}
@@ -245,6 +259,18 @@ void UpdateIfReady()
 		UpdateAutomationName();
 	}
 
+#if __IOS__
+	void RefreshPhoto(object sender, RoutedEventArgs e)
+	{
+		VisualStateManager.GoToState(this, "Photo", false);
+
+		if (TemplateSettings.ActualImageBrush is { } brush)
+		{
+			brush.ImageOpened -= RefreshPhoto;
+		}
+	}
+#endif
+
 	void UpdateBadge()
 	{
 		if (BadgeImageSource != null)

src/Uno.UI/UI/Xaml/Media/ImageSource.iOS.cs

@@ -55,6 +55,11 @@ public static NSUrlSession DefaultSession
 
 		static public implicit operator ImageSource(UIImage image) => new ImageSource(image);
 
+		/// <summary>
+		/// Indicates that this source has already been opened (So TryOpenSync will return true!)
+		/// </summary>
+		internal bool IsOpened => _imageData.HasData;
+
 		private static UIImage? OpenBundleFromString(string? bundle)
 		{
 			if (!bundle.IsNullOrWhiteSpace())