[iOS] Html label not applying bold or italics

src/Controls/src/Core/Label/Label.Mapper.cs

@@ -37,6 +37,10 @@ public partial class Label
 			LabelHandler.Mapper.ModifyMapping<Label, ILabelHandler>(nameof(LineHeight), MapLineHeight);
 #endif
 
+#if IOS
+			LabelHandler.Mapper.AppendToMapping<Label, ILabelHandler>(nameof(ILabel.Font), MapHtmlText);
+#endif
+
 			// platform-specifics
 #if WINDOWS
 			LabelHandler.Mapper.ReplaceMapping<Label, ILabelHandler>(PlatformConfiguration.WindowsSpecific.InputView.DetectReadingOrderFromContentProperty.PropertyName, MapDetectReadingOrderFromContent);

src/Controls/src/Core/Label/Label.iOS.cs

@@ -26,6 +26,14 @@ public static void MapText(ILabelHandler handler, Label label)
 			MapFormatting(handler, label);
 		}
 
+		internal static void MapHtmlText(ILabelHandler handler, Label label)
+		{
+			if (handler.PlatformView?.AttributedText != null)
+			{
+				handler.PlatformView?.UpdateTextHtml(label);
+			}
+		}
+
 		public static void MapLineBreakMode(ILabelHandler handler, Label label)
 		{
 			handler.PlatformView?.UpdateLineBreakMode(label);

src/Controls/tests/TestCases.HostApp/Issues/Issue20372.xaml

@@ -0,0 +1,46 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="Maui.Controls.Sample.Issues.Issue20372"
+             xmlns:ns="clr-namespace:Maui.Controls.Sample.Issues">
+    <ContentPage.Resources>
+        <Style x:Key="PrimaryStyle"
+               TargetType="Label">
+            <Setter Property="FontSize" Value="22" />
+            <Setter Property="TextColor" Value="MediumPurple" />
+        </Style>
+    </ContentPage.Resources>
+
+    <VerticalStackLayout Margin="20">
+
+        <Label TextType="Html"
+               AutomationId="label1"
+               x:Name="label1"
+               Style="{StaticResource PrimaryStyle}">
+            <Label.Text>
+                <![CDATA[
+                    <strong>Bold Text</strong><br>
+                    <em>italics</em><br>
+                    <ul>
+                      <li>Item 1</li>
+                      <li>Item 2</li>
+                    </ul>
+                ]]>
+            </Label.Text>
+        </Label>
+
+        <Label TextType="Html">
+            <Label.Text>
+                <![CDATA[
+                    <strong>Bold Text</strong><br>
+                    <em>italics</em><br>
+                    <ul>
+                      <li>Item 1</li>
+                      <li>Item 2</li>
+                    </ul>
+                ]]>
+            </Label.Text>
+        </Label>
+
+    </VerticalStackLayout>
+</ContentPage>

src/Controls/tests/TestCases.HostApp/Issues/Issue20372.xaml.cs

@@ -0,0 +1,15 @@
+using Microsoft.Maui.Controls;
+using Microsoft.Maui.Controls.Xaml;
+
+namespace Maui.Controls.Sample.Issues
+{
+	[XamlCompilation(XamlCompilationOptions.Compile)]
+	[Issue(IssueTracker.Github, 20372, "[iOS] HTML Label not applying Bold or Italics on iOS", PlatformAffected.iOS)]
+	public partial class Issue20372 : ContentPage
+	{
+		public Issue20372()
+		{
+			InitializeComponent();
+		}
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue20372.cs

@@ -0,0 +1,25 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues
+{
+	public class Issue20372 : _IssuesUITest
+	{
+		public override string Issue => "[iOS] HTML Label not applying Bold or Italics on iOS";
+
+		public Issue20372(TestDevice device) : base(device)
+		{
+		}
+
+		[Test]
+		[Category(UITestCategories.WebView)]
+		public void BothHtmlLabelsShouldApplyBoldAndItalicaProperties()
+		{
+			_ = App.WaitForElement("label1");
+
+			// Both labels should have proper text attributes
+			VerifyScreenshot();
+		}
+	}
+}

src/Core/src/Platform/iOS/LabelExtensions.cs

@@ -87,10 +87,37 @@ internal static void UpdateTextHtml(this UILabel platformLabel, ILabel label)
 #endif
 			};
 
+			var uiFontAttribute = label?.Handler?.GetRequiredService<IFontManager>()?.GetFont(label.Font, UIFont.LabelFontSize);
+
 			NSError nsError = new();
-#pragma warning disable CS8601
-			platformLabel.AttributedText = new NSAttributedString(text, attr, ref nsError);
-#pragma warning restore CS8601
+			var attributedString = new NSMutableAttributedString(new NSAttributedString(text, attr, ref nsError));
+
+			// Enumerate through the attributes in the string and update font size
+			attributedString.EnumerateAttributes(new NSRange(0, attributedString.Length), NSAttributedStringEnumeration.None,
+				(NSDictionary attrs, NSRange range, ref bool stop) =>
+				{
+					if (label!.Font.Family == null)
+					{
+						var font = attrs[UIStringAttributeKey.Font] as UIFont;
+						if (font != null)
+						{
+							font = font.WithSize((nfloat)(label?.Font.Size ?? UIFont.LabelFontSize));
+							attributedString.AddAttribute(UIStringAttributeKey.Font, font, range);
+						}
+					}
+					else if (uiFontAttribute != null)
+					{
+						attributedString.AddAttribute(UIStringAttributeKey.Font, uiFontAttribute, range);
+					}
+
+					if(label?.TextColor != null)
+					{
+						var color = label.TextColor.ToPlatform();
+						attributedString.AddAttribute(UIStringAttributeKey.ForegroundColor, color, range);
+					}
+				});
+
+			platformLabel.AttributedText = attributedString;
 		}
 
 		internal static void UpdateTextPlainText(this UILabel platformLabel, IText label)