Fix iOS Label being truncated when using Padding

src/Controls/tests/TestCases.HostApp/Issues/Issue28180.xaml

@@ -0,0 +1,28 @@
+<?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.Issue28180"
+             xmlns:ns="clr-namespace:Maui.Controls.Sample.Issues">
+  <ScrollView>
+    <VerticalStackLayout
+      Padding="30,0"
+      Spacing="25">
+
+      <Label
+        x:Name="LongTextLabel"
+        AutomationId="LongTextLabel"
+        Padding = "50"
+        Text="Welcome to this longer text in a Label that should display it's complete contents, but doesn't really do so when it has Padding applied on IOS."
+        FontSize="32"
+        HorizontalOptions="Center"
+        SemanticProperties.HeadingLevel="Level1" />
+
+      <Button
+        x:Name="ToggleBtn"
+        Text="Click me"
+        SemanticProperties.Hint="Toggles longer and shorter text for the second label"
+        Clicked="OnToggleClicked"
+        HorizontalOptions="Fill" />
+    </VerticalStackLayout>
+  </ScrollView>
+</ContentPage>

src/Controls/tests/TestCases.HostApp/Issues/Issue28180.xaml.cs

@@ -0,0 +1,15 @@
+namespace Maui.Controls.Sample.Issues;
+
+[Issue(IssueTracker.Github, 28180, "Labels with Padding are truncated on iOS", PlatformAffected.iOS | PlatformAffected.macOS)]
+public partial class Issue28180 : ContentPage
+{
+	public Issue28180()
+	{
+		InitializeComponent();
+	}
+
+	private void OnToggleClicked(object sender, EventArgs e)
+	{
+		LongTextLabel.Padding = LongTextLabel.Padding == 50 ? 0 : 50;
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue28180.cs

@@ -0,0 +1,26 @@
+#if IOSUITEST || MACUITEST
+
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+
+public class Issue28180 : _IssuesUITest
+{
+	public Issue28180(TestDevice testDevice) : base(testDevice)
+	{
+	}
+
+	public override string Issue => "Labels with Padding are truncated on iOS";
+
+	[Test]
+	[Category(UITestCategories.Label)]
+	public void LabelWithPaddingIsNotTruncated()
+	{
+		App.WaitForElement("LongTextLabel");
+		VerifyScreenshot();
+	}
+}
+
+#endif

src/Core/src/Platform/iOS/MauiLabel.cs

@@ -48,18 +48,18 @@ public override void DrawText(RectangleF rect)
 
 		RectangleF AlignVertical(RectangleF rect)
 		{
-			var frameSize = Frame.Size;
-			var height = Lines == 1 ? Font.LineHeight : SizeThatFits(frameSize).Height;
+			var availableSize = rect.Size;
+			var requiredHeight = Lines == 1 ? Font.LineHeight : base.SizeThatFits(rect.Size).Height;
 
-			if (height < frameSize.Height)
+			if (requiredHeight < availableSize.Height)
 			{
 				if (_verticalAlignment == UIControlContentVerticalAlignment.Top)
 				{
-					rect.Height = height;
+					rect.Height = requiredHeight;
 				}
 				else if (_verticalAlignment == UIControlContentVerticalAlignment.Bottom)
 				{
-					rect = new RectangleF(rect.X, rect.Bottom - height, rect.Width, height);
+					rect = new RectangleF(rect.X, rect.Bottom - requiredHeight, rect.Width, requiredHeight);
 				}
 			}
 
@@ -74,7 +74,7 @@ public override SizeF SizeThatFits(SizeF size)
 			var requestedSize = base.SizeThatFits(new SizeF(adjustedWidth, adjustedHeight));
 
 			// Let's be sure the label is not larger than the container
-			return AddInsets(new Size()
+			return AddInsets(new Size
 			{
 				Width = nfloat.Min(requestedSize.Width, size.Width),
 				Height = nfloat.Min(requestedSize.Height, size.Height),