Improve iOS Label performance

src/Controls/src/Core/Entry/Entry.Mapper.cs

@@ -18,7 +18,7 @@ public partial class Entry
 			EntryHandler.Mapper.ReplaceMapping<Entry, IEntryHandler>(PlatformConfiguration.iOSSpecific.Entry.AdjustsFontSizeToFitWidthProperty.PropertyName, MapAdjustsFontSizeToFitWidth);
 #endif
 			EntryHandler.Mapper.ReplaceMapping<Entry, IEntryHandler>(nameof(Text), MapText);
-			EntryHandler.Mapper.ReplaceMapping<Entry, IEntryHandler>(nameof(TextTransform), MapText);
+			EntryHandler.Mapper.ReplaceMapping<Entry, IEntryHandler>(nameof(TextTransform), MapTextTransform);
 
 #if IOS || ANDROID
 			EntryHandler.Mapper.AppendToMapping(nameof(VisualElement.IsFocused), InputView.MapIsFocused);
@@ -28,5 +28,16 @@ public partial class Entry
 			EntryHandler.CommandMapper.PrependToMapping(nameof(IEntry.Focus), InputView.MapFocus);
 #endif
 		}
+
+		static void MapTextTransform(IEntryHandler handler, Entry label)
+		{
+			if (label.IsConnectingHandler())
+			{
+				// If we're connecting the handler, we don't want to map the text multiple times.
+				return;
+			}
+
+			MapText(handler, label);
+		}
 	}
 }

src/Controls/src/Core/Entry/Entry.iOS.cs

@@ -16,7 +16,14 @@ public static void MapAdjustsFontSizeToFitWidth(IEntryHandler handler, Entry ent
 		public static void MapText(IEntryHandler handler, Entry entry)
 		{
 			Platform.TextExtensions.UpdateText(handler.PlatformView, entry);
-			EntryHandler.MapFormatting(handler, entry);
+
+			if (!handler.IsConnectingHandler())
+			{
+				// If we're not connecting the handler, we need to update the text formatting
+				// This is because the text may have changed, and we need to ensure that
+				// any attributed string formatting is applied correctly.
+				EntryHandler.MapFormatting(handler, entry);
+			}
 		}
 
 		public static void MapCursorColor(EntryHandler handler, Entry entry) =>

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

@@ -57,7 +57,10 @@ static void MapTextTransform(ILabelHandler handler, Label label) =>
 		static void MapFormattedText(ILabelHandler handler, Label label)
 		{
 			if (label.IsConnectingHandler())
+			{
+				// If we're connecting the handler, we don't want to map the text multiple times.
 				return;
+			}
 
 			MapText(handler, label);
 		}
@@ -139,9 +142,12 @@ static void MapFont(ILabelHandler handler, Label label, Action<IElementHandler,
 		{
 			if (label.HasFormattedTextSpans)
 			{
-				// if there is formatted text,
-				// then we re-apply the whole formatted text
-				handler.UpdateValue(nameof(FormattedText));
+				if (!handler.IsConnectingHandler())
+				{
+					// if there is formatted text,
+					// then we re-apply the whole formatted text
+					handler.UpdateValue(nameof(FormattedText));
+				}
 			}
 			else if (label.TextType == TextType.Text || !IsDefaultFont(label))
 			{

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

@@ -1,5 +1,4 @@
 #nullable disable
-using System;
 using Microsoft.Maui.Controls.Platform;
 using Microsoft.Maui.Graphics;
 using UIKit;
@@ -23,7 +22,11 @@ public static void MapText(ILabelHandler handler, Label label)
 		{
 			Platform.LabelExtensions.UpdateText(handler.PlatformView, label);
 
-			MapFormatting(handler, label);
+			if (!handler.IsConnectingHandler())
+			{
+				// Any text update requires that we update any attributed string formatting
+				MapFormatting(handler, label);
+			}
 		}
 
 		public static void MapLineBreakMode(ILabelHandler handler, Label label)

src/Controls/tests/TestCases.HostApp/FeatureMatrix/Button/ButtonControlPage.xaml

@@ -55,12 +55,17 @@
               </Button>
 
               <Label Grid.Row="1"
-                     Text="Clicked Event: "/>
+                     Text="Clicked Event: "
+                     AutomationId="MainLabel">
+                <Label.GestureRecognizers>
+                  <TapGestureRecognizer Tapped="MainLabel_Tapped"/>
+                </Label.GestureRecognizers>
+              </Label>
               <Label Grid.Row="1"
                      Grid.Column="1"
                      x:Name="ClickedEventLabel"
                      AutomationId="ClickedEventLabel"/>
-
+              
               <Label Grid.Row="2"
                      Text="Pressed Event: "/>
               <Label Grid.Row="2"

src/Controls/tests/TestCases.HostApp/FeatureMatrix/Button/ButtonControlPage.xaml.cs

@@ -1,3 +1,5 @@
+using Microsoft.Maui.Controls.Internals;
+
 namespace Maui.Controls.Sample;
 
 public class ButtonControlPage : NavigationPage
@@ -52,4 +54,17 @@ public void OnButtonReleased(object sender, EventArgs e)
 			ReleasedEventLabel.Text = "Released Event Executed";
 		}
 	}
+
+	void MainLabel_Tapped(object sender, TappedEventArgs e)
+	{
+		// Recreate the page to verify initial mappers
+		ToolbarItems.Clear();
+		Content = new ContentView();
+		INameScope scope = this;
+		scope.UnregisterName("ClickedEventLabel");
+		scope.UnregisterName("ReleasedEventLabel");
+		scope.UnregisterName("PressedEventLabel");
+		scope.UnregisterName("ButtonShadow");
+		InitializeComponent();
+	}
 }

src/Controls/tests/TestCases.HostApp/FeatureMatrix/EntryControl/EntryControlPage.xaml

@@ -6,10 +6,14 @@
        <VerticalStackLayout Padding="20"
                             Spacing="8">
               <Label Text="Entry Control"
+                     AutomationId="MainLabel"
                      FontSize="20"
                      Margin="0,0,0,50"
-                     HorizontalOptions="Center"/>
-
+                     HorizontalOptions="Center">
+                <Label.GestureRecognizers>
+                  <TapGestureRecognizer Tapped="MainLabel_Tapped"/>
+                </Label.GestureRecognizers>
+              </Label>
               <local:UITestEntry x:Name="EntryControl"
                                  IsCursorVisible="False"
                                  Text="{Binding Text}"

src/Controls/tests/TestCases.HostApp/FeatureMatrix/EntryControl/EntryControlPage.xaml.cs

@@ -1,5 +1,6 @@
 using System.ComponentModel;
 using Microsoft.Maui.Controls;
+using Microsoft.Maui.Controls.Internals;
 
 namespace Maui.Controls.Sample;
 
@@ -122,4 +123,20 @@ private void EntryControl_Unfocused(object sender, FocusEventArgs e)
 			vm.UnfocusedText = eventInfo;
 		}
 	}
+
+	void MainLabel_Tapped(object sender, TappedEventArgs e)
+	{
+		// Recreate the page to verify initial mappers
+		ToolbarItems.Clear();
+		Content = new ContentView();
+		INameScope scope = this;
+		scope.UnregisterName("EntryControl");
+		scope.UnregisterName("TextChangedLabel");
+		scope.UnregisterName("SelectionLengthEntry");
+		scope.UnregisterName("CursorPositionEntry");
+		scope.UnregisterName("CompletedLabel");
+		scope.UnregisterName("FocusedLabel");
+		scope.UnregisterName("UnfocusedLabel");
+		InitializeComponent();
+	}
 }

src/Controls/tests/TestCases.HostApp/FeatureMatrix/EntryControl/EntryOptionsPage.xaml

@@ -45,6 +45,7 @@
                                     Clicked="HorizontalAlignmentButton_Clicked"/>
                             <Button Text="End"
                                     AutomationId="HEnd"
+                                    FontSize="10"
                                     Clicked="HorizontalAlignmentButton_Clicked"/>
                      </HorizontalStackLayout>
                      <!-- Vertical Alignment -->

src/Controls/tests/TestCases.HostApp/FeatureMatrix/Label/LabelControlPage.xaml

@@ -30,6 +30,10 @@
         TextType="{Binding TextType}"
         VerticalTextAlignment="{Binding VerticalTextAlignment}"
         BackgroundColor="LightGray"
-        AutomationId="MainLabel"/>
+        AutomationId="MainLabel">
+        <Label.GestureRecognizers>
+          <TapGestureRecognizer Tapped="MainLabel_Tapped"/>
+        </Label.GestureRecognizers>
+      </Label>
     </VerticalStackLayout>
 </ContentPage>

src/Controls/tests/TestCases.HostApp/FeatureMatrix/Label/LabelControlPage.xaml.cs

@@ -30,4 +30,12 @@ private async void NavigateToOptionsPage_Clicked(object sender, EventArgs e)
 		BindingContext = _viewModel = new LabelViewModel();
 		await Navigation.PushAsync(new LabelOptionsPage(_viewModel));
 	}
+
+	void MainLabel_Tapped(object sender, TappedEventArgs e)
+	{
+		// Recreate the page to verify initial mappers
+		ToolbarItems.Clear();
+		Content = new ContentView();
+		InitializeComponent();
+	}
 }