iOS NavigationPageHandler (#852)

* iOS Navigation

* - wire up iOS Navigation

* - remove VET

* - rework with HR

* - fix namespace

* - fix HR

* - fix hr

* - fix SO exception

* - maybe?

* - nullabel fix

Directory.Build.props

@@ -1,12 +1,33 @@
 <Project>
   <Import Project="eng\Versions.props" />
+
   <PropertyGroup>
+
     <BuildForWinUI Condition="'$(SolutionFileName)' == 'Microsoft.Maui.WinUI.sln'">true</BuildForWinUI>
     <BuildForNet6 Condition="'$(SolutionFileName)' == 'Microsoft.Maui-net6.sln' or '$(BuildForWinUI)' == 'true'">true</BuildForNet6>
     <MauiPlatforms>net6.0-ios;net6.0-maccatalyst;net6.0-android</MauiPlatforms>
     <WindowsTargetFramework Condition="'$(WindowsTargetFramework)' == ''">net6.0-windows10.0.18362</WindowsTargetFramework>
     <MauiPlatforms Condition="'$(Packing)' == 'true'">$(MauiPlatforms);$(WindowsTargetFramework)</MauiPlatforms>
     <MauiPlatforms Condition="'$(BuildForWinUI)' == 'true'">$(WindowsTargetFramework)</MauiPlatforms>
+
+    <!-- This is used to easily build for a specific target to make the IDE work a bit better  -->   
+    <NonNet6Platforms>Xamarin.iOS10;MonoAndroid10.0</NonNet6Platforms>
+    <NonNet6EssentialsPlatforms>netstandard2.0;netstandard2.1;Xamarin.iOS10;MonoAndroid90;MonoAndroid10.0;tizen40;Xamarin.Mac20;</NonNet6EssentialsPlatforms>
+    <NonNet6EssentialsPlatforms Condition=" '$(OS)' == 'Windows_NT'">$(NonNet6EssentialsPlatforms);uap10.0.16299;</NonNet6EssentialsPlatforms>
+
+    <BuildNonNet6ForiOS>false</BuildNonNet6ForiOS>
+    <BuildNonNet6ForiOS Condition="'$(SolutionFileName)' == 'Microsoft.Maui.iOS.sln'">true</BuildNonNet6ForiOS>
+    <NonNet6Platforms Condition="'$(BuildNonNet6ForiOS)' == 'true'">Xamarin.iOS10</NonNet6Platforms>
+    <NonNet6EssentialsPlatforms Condition="'$(BuildNonNet6ForiOS)' == 'true'">netstandard2.0;netstandard2.1;Xamarin.iOS10</NonNet6EssentialsPlatforms>
+
+    <BuildNonNet6ForAndroid>false</BuildNonNet6ForAndroid>
+    <NonNet6Platforms Condition="'$(BuildNonNet6ForAndroid)' == 'true'">MonoAndroid10.0</NonNet6Platforms>
+    <NonNet6EssentialsPlatforms Condition="'$(BuildNonNet6ForAndroid)' == 'true'">netstandard2.0;netstandard2.1;MonoAndroid10.0</NonNet6EssentialsPlatforms>
+
+  </PropertyGroup>
+
+  <PropertyGroup>
+
     <_MauiBuildTasksLocation>$(_MauiBuildTasksLocation)</_MauiBuildTasksLocation>
     <_MauiBuildTasksLocation Condition="'$(_MauiBuildTasksLocation)' == ''">$(MSBuildThisFileDirectory).nuspec\</_MauiBuildTasksLocation>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>

src/Controls/samples/Controls.Sample.iOS/Controls.Sample.iOS.csproj

@@ -70,9 +70,6 @@
     <Reference Include="System.Numerics" />
     <Reference Include="System.Numerics.Vectors" />
   </ItemGroup>
-  <ItemGroup>
-    <InterfaceDefinition Include="LaunchScreen.storyboard" />
-  </ItemGroup>
   <ItemGroup>
     <None Include="Info.plist" />
     <None Include="Entitlements.plist" />

src/Controls/samples/Controls.Sample/Controls.Sample.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="MSBuild.Sdk.Extras">
 
   <PropertyGroup>
-    <TargetFrameworks>MonoAndroid10.0;Xamarin.iOS10</TargetFrameworks>
+    <TargetFrameworks>$(NonNet6Platforms)</TargetFrameworks>
   </PropertyGroup>
 
   <ItemGroup>

src/Controls/samples/Controls.Sample/Pages/MainPage.cs

@@ -20,6 +20,7 @@ public class MainPage : BasePage
 
 		public MainPage(IServiceProvider services, MainPageViewModel viewModel)
 		{
+			BackgroundColor = Colors.White;
 			ToolbarItems.Add(new ToolbarItem()
 			{
 				Text = "Page"

src/Controls/samples/Controls.Sample/Pages/SemanticsPage.xaml

@@ -1,7 +1,8 @@
 <controls:BasePage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
                    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
                    xmlns:controls="clr-namespace:Maui.Controls.Sample.Controls"
-                   x:Class="Maui.Controls.Sample.Pages.SemanticsPage">
+                   x:Class="Maui.Controls.Sample.Pages.SemanticsPage"
+                   BackgroundColor="White">
 
     <ScrollView Margin="15,20">
         <VerticalStackLayout>

src/Controls/src/Core/ArrayExtensions.cs

@@ -0,0 +1,39 @@
+using System;
+using Microsoft.Maui.Controls.Internals;
+
+namespace Microsoft.Maui.Controls.Platform
+{
+	internal static class ArrayExtensions
+	{
+		public static T[] Insert<T>(this T[] self, int index, T item)
+		{
+			var result = new T[self.Length + 1];
+			if (index > 0)
+				Array.Copy(self, result, index);
+
+			result[index] = item;
+
+			if (index < self.Length)
+				Array.Copy(self, index, result, index + 1, result.Length - index - 1);
+
+			return result;
+		}
+
+		public static T[] Remove<T>(this T[] self, T item)
+		{
+			return self.RemoveAt(self.IndexOf(item));
+		}
+
+		public static T[] RemoveAt<T>(this T[] self, int index)
+		{
+			var result = new T[self.Length - 1];
+			if (index > 0)
+				Array.Copy(self, result, index);
+
+			if (index < self.Length - 1)
+				Array.Copy(self, index + 1, result, index, self.Length - index - 1);
+
+			return result;
+		}
+	}
+}

src/Controls/src/Core/Controls.Core.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="MSBuild.Sdk.Extras">
 	<PropertyGroup>
-		<TargetFrameworks>netstandard2.1;netstandard2.0;$(AndroidTargetFrameworks)</TargetFrameworks>
+		<TargetFrameworks>netstandard2.1;netstandard2.0;$(NonNet6Platforms)</TargetFrameworks>
 		<AssemblyName>Microsoft.Maui.Controls</AssemblyName>
 	</PropertyGroup>
 	<PropertyGroup>

src/Controls/src/Core/Handlers/NavigationPage/NavigationPageHandler.cs

@@ -25,7 +25,7 @@ public static PropertyMapper<NavigationPage, NavigationPageHandler> NavigationPa
 					[nameof(ToolbarPlacementProperty.PropertyName)] = MapToolbarPlacement,
 					[nameof(ToolbarDynamicOverflowEnabledProperty.PropertyName)] = MapToolbarDynamicOverflowEnabled,
 #endif
-			};
+			   };
 
 		public NavigationPageHandler() : base(NavigationPageMapper)
 		{

src/Controls/src/Core/Handlers/NavigationPage/NavigationPageHandler.iOS.cs

@@ -1,17 +1,31 @@
-using System;
+#nullable enable
+
+using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Text;
+using System.Threading.Tasks;
+using Microsoft.Maui.Controls.Internals;
+using Microsoft.Maui.Controls.Platform;
 using Microsoft.Maui.Handlers;
 using UIKit;
 
 namespace Microsoft.Maui.Controls.Handlers
 {
 	public partial class NavigationPageHandler :
-		ViewHandler<NavigationPage, UIView>
+		ViewHandler<NavigationPage, UIView>, INativeViewHandler
 	{
+		ControlsNavigationController _controlsNavigationController;
+		UIViewController? INativeViewHandler.ViewController => _controlsNavigationController;
+
 		protected override UIView CreateNativeView()
 		{
-			throw new NotImplementedException();
+			_controlsNavigationController = new ControlsNavigationController(this);
+
+			if (_controlsNavigationController.View == null)
+				throw new NullReferenceException("ControlsNavigationController.View is null");
+
+			return _controlsNavigationController.View;
 		}
 
 		public static void MapPadding(NavigationPageHandler handler, NavigationPage view) { }
@@ -23,5 +37,58 @@ public static void MapNavigationBarBackground(NavigationPageHandler handler, Nav
 		public static void MapTitleIcon(NavigationPageHandler handler, NavigationPage view) { }
 
 		public static void MapTitleView(NavigationPageHandler handler, NavigationPage view) { }
+
+
+		protected override void ConnectHandler(UIView nativeView)
+		{
+			base.ConnectHandler(nativeView);
+
+			if (VirtualView == null)
+				return;
+
+			VirtualView.PushRequested += OnPushRequested;
+			VirtualView.PopRequested += OnPopRequested;
+			_controlsNavigationController.LoadPages(this.MauiContext);
+
+			//VirtualView.PopToRootRequested += OnPopToRootRequested;
+			//VirtualView.RemovePageRequested += OnRemovedPageRequested;
+			//VirtualView.InsertPageBeforeRequested += OnInsertPageBeforeRequested;
+		}
+
+		protected override void DisconnectHandler(UIView nativeView)
+		{
+			base.DisconnectHandler(nativeView);
+
+			if (VirtualView == null)
+				return;
+
+			VirtualView.PushRequested -= OnPushRequested;
+			VirtualView.PopRequested -= OnPopRequested;
+			//VirtualView.PopToRootRequested -= OnPopToRootRequested;
+			//VirtualView.RemovePageRequested -= OnRemovedPageRequested;
+			//VirtualView.InsertPageBeforeRequested -= OnInsertPageBeforeRequested;
+		}
+
+		void OnPopRequested(object? sender, NavigationRequestedEventArgs e)
+		{
+			_controlsNavigationController?
+				.OnPopRequestedAsync(e)
+				.FireAndForget((exc) => Log.Warning(nameof(NavigationPage), $"{exc}"));
+		}
+
+		void OnPushRequested(object? sender, NavigationRequestedEventArgs e)
+		{
+			_controlsNavigationController?
+				.OnPushRequested(e, this.MauiContext);
+		}
+
+		internal void SendPopping(Task popTask)
+		{
+			if (VirtualView == null)
+				return;
+
+			(VirtualView as INavigationPageController)?.PopAsyncInner(false, true)
+				.FireAndForget((exc) => Log.Warning(nameof(NavigationPage), $"{exc}"));
+		}
 	}
 }

src/Controls/src/Core/NavigationPage.cs

@@ -176,7 +176,7 @@ public async Task<Page> PopAsync(bool animated)
 				else
 					CurrentNavigationTask = tcs.Task;
 
-				var result = await PopAsyncInner(animated, false);
+				var result = await (this as INavigationPageController).PopAsyncInner(animated, false);
 				tcs.SetResult(true);
 				return result;
 			}
@@ -291,8 +291,7 @@ protected override bool OnBackButtonPressed()
 		[EditorBrowsable(EditorBrowsableState.Never)]
 		public event EventHandler<NavigationRequestedEventArgs> InsertPageBeforeRequested;
 
-		[EditorBrowsable(EditorBrowsableState.Never)]
-		public async Task<Page> PopAsyncInner(bool animated, bool fast)
+		async Task<Page> INavigationPageController.PopAsyncInner(bool animated, bool fast)
 		{
 			if (StackDepth == 1)
 			{