feat(iOS): Add CommandBar Sample

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

@@ -3769,6 +3769,18 @@
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
+    <Page Include="$(MSBuildThisFileDirectory)Windows_UI_Xaml_Controls\CommandBar\BackButtonTitle\CommandBar_Frame.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
+    <Page Include="$(MSBuildThisFileDirectory)Windows_UI_Xaml_Controls\CommandBar\BackButtonTitle\CommandBar_Page1.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
+    <Page Include="$(MSBuildThisFileDirectory)Windows_UI_Xaml_Controls\CommandBar\BackButtonTitle\CommandBar_Page2.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
   </ItemGroup>
   <ItemGroup>
     <Compile Include="$(MSBuildThisFileDirectory)Helpers\BindableBase.cs" />
@@ -6633,6 +6645,15 @@
     <Compile Include="$(MSBuildThisFileDirectory)Windows_UI_Xaml_Controls\CommandBar\Background\CommandBar_Background_Frame.xaml.cs">
       <DependentUpon>CommandBar_Background_Frame.xaml</DependentUpon>
     </Compile>
+    <Compile Include="$(MSBuildThisFileDirectory)Windows_UI_Xaml_Controls\CommandBar\BackButtonTitle\CommandBar_Frame.xaml.cs">
+      <DependentUpon>CommandBar_Frame.xaml</DependentUpon>
+    </Compile>
+    <Compile Include="$(MSBuildThisFileDirectory)Windows_UI_Xaml_Controls\CommandBar\BackButtonTitle\CommandBar_Page1.xaml.cs">
+      <DependentUpon>CommandBar_Page1.xaml</DependentUpon>
+    </Compile>
+    <Compile Include="$(MSBuildThisFileDirectory)Windows_UI_Xaml_Controls\CommandBar\BackButtonTitle\CommandBar_Page2.xaml.cs">
+      <DependentUpon>CommandBar_Page2.xaml</DependentUpon>
+    </Compile>
   </ItemGroup>
   <ItemGroup>
     <Content Include="$(MSBuildThisFileDirectory)Assets\0_leading_number_asset.png" />
@@ -6752,6 +6773,7 @@
     <Folder Include="$(MSBuildThisFileDirectory)Windows_UI_Xaml_Controls\Repeater\WinUI\Samples\" />
     <Folder Include="$(MSBuildThisFileDirectory)Windows_UI_Xaml_Controls\TimePicker\Model\" />
     <Folder Include="$(MSBuildThisFileDirectory)Windows_UI_Xaml_Controls\CommandBar\Background\" />
+    <Folder Include="$(MSBuildThisFileDirectory)Windows_UI_Xaml_Controls\CommandBar\BackButtonTitle\" />
   </ItemGroup>
   <ItemGroup>
     <Compile Include="$(MSBuildThisFileDirectory)Windows_UI_Input\CaptureTests\OverlappedControls.xaml.cs">

src/SamplesApp/UITests.Shared/Windows_UI_Xaml_Controls/CommandBar/BackButtonTitle/CommandBar_Frame.xaml

@@ -0,0 +1,26 @@
+<UserControl x:Class="UITests.Windows_UI_Xaml_Controls.CommandBar.BackButtonTitle.CommandBar_Frame"
+			 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+			 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+			 xmlns:local="using:UITests.Windows_UI_Xaml_Controls.CommandBar.BackButtonTitle"
+			 xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+			 xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+			 xmlns:xamarin="http://uno.ui/xamarin"
+			 mc:Ignorable="d xamarin"
+			 d:DesignHeight="300"
+			 d:DesignWidth="400">
+
+	<Grid>
+		<Grid.RowDefinitions>
+			<RowDefinition Height="*" />
+			<RowDefinition Height="Auto" />
+		</Grid.RowDefinitions>
+
+		<Frame x:Name="HostFrame"
+			   xamarin:Style="{StaticResource NativeDefaultFrame}" />
+
+		<Button x:Name="NavigateInitialButton"
+				Grid.Row="1"
+				Content="Navigate to first page"
+				Click="Navigate_Initial" />
+	</Grid>
+</UserControl>

src/SamplesApp/UITests.Shared/Windows_UI_Xaml_Controls/CommandBar/BackButtonTitle/CommandBar_Frame.xaml.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices.WindowsRuntime;
+using UITests.Windows_UI_Xaml_Controls.CommandBar.Native_Frame;
+using Uno.UI.Samples.Controls;
+using Windows.Foundation;
+using Windows.Foundation.Collections;
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Windows.UI.Xaml.Controls.Primitives;
+using Windows.UI.Xaml.Data;
+using Windows.UI.Xaml.Input;
+using Windows.UI.Xaml.Media;
+using Windows.UI.Xaml.Navigation;
+
+// The User Control item template is documented at https://go.microsoft.com/fwlink/?LinkId=234236
+
+namespace UITests.Windows_UI_Xaml_Controls.CommandBar.BackButtonTitle
+{
+	[SampleControlInfo("CommandBar", "CommandBar_BackButtonTitle")]
+	public sealed partial class CommandBar_Frame : UserControl
+	{
+		public CommandBar_Frame()
+		{
+			this.InitializeComponent();
+		}
+
+		private void Navigate_Initial(object sender, RoutedEventArgs args)
+		{
+			HostFrame.Navigate(typeof(CommandBar_Page1));
+		}
+	}
+}

src/SamplesApp/UITests.Shared/Windows_UI_Xaml_Controls/CommandBar/BackButtonTitle/CommandBar_Page1.xaml

@@ -0,0 +1,33 @@
+<Page
+    x:Class="UITests.Windows_UI_Xaml_Controls.CommandBar.BackButtonTitle.CommandBar_Page1"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:UITests.Windows_UI_Xaml_Controls.CommandBar.BackButtonTitle"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:xamarin="http://uno.ui/xamarin"
+    mc:Ignorable="d xamarin"
+    d:DesignHeight="300"
+    d:DesignWidth="400">
+
+	<Grid>
+		<Grid.RowDefinitions>
+			<RowDefinition Height="Auto" />
+			<RowDefinition Height="*" />
+		</Grid.RowDefinitions>
+
+		<StackPanel Grid.Row="1"
+					Spacing="10"
+					VerticalAlignment="Center">
+
+			<TextBlock Text="Main Page"
+			           HorizontalAlignment="Center" />
+
+			<Button x:Name="NavigateToPage2Button"
+			        Content="Navigate to Page 2"
+			        Grid.Row="1"
+			        Click="OnButtonClicked"
+			        HorizontalAlignment="Center"/>
+		</StackPanel>
+	</Grid>
+</Page>

src/SamplesApp/UITests.Shared/Windows_UI_Xaml_Controls/CommandBar/BackButtonTitle/CommandBar_Page1.xaml.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Threading.Tasks;
+using Windows.UI;
+using Uno.UI.Samples.Controls;
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Windows.UI.Xaml.Media;
+
+// The User Control item template is documented at https://go.microsoft.com/fwlink/?LinkId=234236
+
+namespace UITests.Windows_UI_Xaml_Controls.CommandBar.BackButtonTitle
+{
+    public sealed partial class CommandBar_Page1 : Page
+    {
+        public CommandBar_Page1()
+        {
+            this.InitializeComponent();
+        }
+
+        public async void OnButtonClicked(object sender, RoutedEventArgs e)
+		{
+			Frame.Navigate(typeof(CommandBar_Page2));			
+		}
+	}
+}

src/SamplesApp/UITests.Shared/Windows_UI_Xaml_Controls/CommandBar/BackButtonTitle/CommandBar_Page2.xaml

@@ -0,0 +1,22 @@
+<Page
+    x:Class="UITests.Windows_UI_Xaml_Controls.CommandBar.BackButtonTitle.CommandBar_Page2"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:UITests.Windows_UI_Xaml_Controls.CommandBar.BackButtonTitle"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    mc:Ignorable="d"
+    d:DesignHeight="300"
+    d:DesignWidth="400">
+
+	<Grid>
+		<Grid.RowDefinitions>
+			<RowDefinition Height="Auto" />
+			<RowDefinition Height="*" />
+		</Grid.RowDefinitions>
+
+		<CommandBar Content="Page 2"
+		            x:Name="Page2CommandBar" />
+
+	</Grid>
+</Page>

src/SamplesApp/UITests.Shared/Windows_UI_Xaml_Controls/CommandBar/BackButtonTitle/CommandBar_Page2.xaml.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices.WindowsRuntime;
+using Uno.UI.Samples.Controls;
+using Windows.Foundation;
+using Windows.Foundation.Collections;
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Windows.UI.Xaml.Controls.Primitives;
+using Windows.UI.Xaml.Data;
+using Windows.UI.Xaml.Input;
+using Windows.UI.Xaml.Media;
+using Windows.UI.Xaml.Navigation;
+
+// The User Control item template is documented at https://go.microsoft.com/fwlink/?LinkId=234236
+
+namespace UITests.Windows_UI_Xaml_Controls.CommandBar.BackButtonTitle
+{
+	public sealed partial class CommandBar_Page2 : Page
+    {
+        public CommandBar_Page2()
+        {
+            this.InitializeComponent();
+        }
+    }
+}