Fix Provided consistent behavior of text color in tabbed page in all platforms.

src/Controls/src/Core/Compatibility/Handlers/TabbedPage/iOS/TabbedRenderer.cs

@@ -531,7 +531,7 @@ void UpdateiOS15TabBarAppearance()
 				tabbed.IsSet(TabbedPage.UnselectedTabColorProperty) ? tabbed.UnselectedTabColor : null,
 				tabbed.IsSet(TabbedPage.BarBackgroundColorProperty) ? tabbed.BarBackgroundColor : null,
 				tabbed.IsSet(TabbedPage.BarTextColorProperty) ? tabbed.BarTextColor : null,
-				null);
+				tabbed.IsSet(TabbedPage.BarTextColorProperty) ? tabbed.BarTextColor : null);
 		}
 
 		#region IPlatformViewHandler

src/Controls/tests/TestCases.HostApp/Issues/Issue18775.xaml

@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<TabbedPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+            xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+            xmlns:local="clr-namespace:Maui.Controls.Sample.Issues"
+            x:Class="Maui.Controls.Sample.Issues.Issue18775" >
+
+  <TabbedPage.Resources>
+
+    <Color x:Key="Primary">#512BD4</Color>
+    <Color x:Key="Light">#DFD8F7</Color>
+    <Color x:Key="Dark">#2B0B98</Color>
+    <Color x:Key="White">White</Color>
+    <Color x:Key="Black">Black</Color>
+    <Color x:Key="LightGray">#E5E5E1</Color>
+    <Color x:Key="DarkGray">#505050</Color>
+    <Style TargetType="TabbedPage" ApplyToDerivedTypes="True">
+      <Setter Property="BarBackgroundColor" Value="{AppThemeBinding Light={StaticResource White}, Dark={StaticResource Black}}" />
+      <Setter Property="BarTextColor" Value="{AppThemeBinding Light={StaticResource Primary}, Dark={StaticResource White}}" />
+      <Setter Property="UnselectedTabColor" Value="{AppThemeBinding Light={StaticResource LightGray}, Dark={StaticResource DarkGray}}" />
+      <Setter Property="SelectedTabColor" Value="{AppThemeBinding Light={StaticResource DarkGray}, Dark={StaticResource LightGray}}" />
+    </Style>
+  </TabbedPage.Resources>
+
+  <NavigationPage Title="One">
+    <x:Arguments>
+      <local:Issue18775NavPage Title="One" />
+    </x:Arguments>
+  </NavigationPage>
+  <NavigationPage Title="Two">
+    <x:Arguments>
+      <local:Issue18775NavPage Title="Two" />
+    </x:Arguments>
+  </NavigationPage>
+  <NavigationPage Title="Three">
+    <x:Arguments>
+      <local:Issue18775NavPage Title="Three" />
+    </x:Arguments>
+  </NavigationPage>
+  <NavigationPage Title="Four">
+    <x:Arguments>
+      <local:Issue18775NavPage Title="Four" />
+    </x:Arguments>
+  </NavigationPage>
+ </TabbedPage>

src/Controls/tests/TestCases.HostApp/Issues/Issue18775.xaml.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Threading.Tasks;
+using Microsoft.Maui;
+using Microsoft.Maui.Controls;
+using Microsoft.Maui.Controls.Xaml;
+using Microsoft.Maui.Devices;
+
+namespace Maui.Controls.Sample.Issues
+{
+	[XamlCompilation(XamlCompilationOptions.Compile)]
+	[Issue(IssueTracker.Github, 18775, "[regression/8.0.3] Cannot control unselected text color of tabs within TabbedPage", PlatformAffected.iOS)]
+	public partial class Issue18775 : TabbedPage
+	{
+		public Issue18775()
+		{
+			InitializeComponent();
+		}
+
+	}
+
+	public partial class Issue18775NavPage :  ContentPage
+	{
+		public Issue18775NavPage()
+		{
+			this.Content = new Label() { Text = "Label" ,AutomationId = "MauiLabel" };
+		}
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue18775.cs

@@ -0,0 +1,25 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues
+{
+	public class Issue18775 : _IssuesUITest
+	{
+
+		public Issue18775(TestDevice device) : base(device)
+		{
+		}
+
+		public override string Issue => "[regression/8.0.3] Cannot control unselected text color of tabs within TabbedPage";
+
+		[Test]
+		[Category(UITestCategories.TabbedPage)]
+		[FailsOnMac]
+		public void TabbedPageUnselectedBarTextColorConsistency()
+		{
+			App.WaitForElement("MauiLabel");
+			VerifyScreenshot();
+		}
+	}
+}