Prep Cell & friends for removal of InternalsVisibleTo (#142)

* Prep Cell & friends for removal of InternalsVisibleTo

Includes:
- Cell
- EntryCell
- ListView
- MenuItem
- TableView
- ViewCell
- Toolbar

Moved extensions to Internal & removed TPH

* Update docs

* [Controls] Ignore Issue2411 on iOS <9

* [Controls] Formatting for Issue2411

5 files changed, 24 insertions, 12 deletions

diff --git a/Xamarin.Forms.Platform.iOS/Cells/CellRenderer.cs b/Xamarin.Forms.Platform.iOS/Cells/CellRenderer.cs
index c01a7774..3ec12bd8 100644
--- a/Xamarin.Forms.Platform.iOS/Cells/CellRenderer.cs
+++ b/Xamarin.Forms.Platform.iOS/Cells/CellRenderer.cs
@@ -1,4 +1,5 @@
 using System;
+using Xamarin.Forms.Internals;
 #if __UNIFIED__
 using UIKit;
 using Foundation;
@@ -32,7 +33,7 @@ namespace Xamarin.Forms.Platform.iOS
 
 		protected void UpdateBackground(UITableViewCell tableViewCell, Cell cell)
 		{
-			if (TemplatedItemsList<ItemsView<Cell>, Cell>.GetIsGroupHeader(cell))
+			if (cell.GetIsGroupHeader<ItemsView<Cell>, Cell>())
 			{
 				if (UIDevice.CurrentDevice.CheckSystemVersion(7, 0))
 					tableViewCell.BackgroundColor = new UIColor(247f / 255f, 247f / 255f, 247f / 255f, 1);
@@ -50,11 +51,11 @@ namespace Xamarin.Forms.Platform.iOS
 			}
 		}
 
-		protected void WireUpForceUpdateSizeRequested(Cell cell, UITableViewCell nativeCell, UITableView tableView)
+		protected void WireUpForceUpdateSizeRequested(ICellController cell, UITableViewCell nativeCell, UITableView tableView)
 		{
 			cell.ForceUpdateSizeRequested -= _onForceUpdateSizeRequested;
 
-			_onForceUpdateSizeRequested = delegate
+			_onForceUpdateSizeRequested = (sender, e) => 
 			{
 				var index = tableView.IndexPathForCell(nativeCell);
 				if (index != null)
diff --git a/Xamarin.Forms.Platform.iOS/Cells/CellTableViewCell.cs b/Xamarin.Forms.Platform.iOS/Cells/CellTableViewCell.cs
index a9265868..f1a53917 100644
--- a/Xamarin.Forms.Platform.iOS/Cells/CellTableViewCell.cs
+++ b/Xamarin.Forms.Platform.iOS/Cells/CellTableViewCell.cs
@@ -1,5 +1,6 @@
 using System;
 using System.ComponentModel;
+using Xamarin.Forms.Internals;
 #if __UNIFIED__
 using UIKit;
 
@@ -27,11 +28,16 @@ namespace Xamarin.Forms.Platform.iOS
 				if (_cell == value)
 					return;
 
-				if (_cell != null)
-					Device.BeginInvokeOnMainThread(_cell.SendDisappearing);
+				ICellController cellController = _cell;
+
+				if (cellController != null)
+					Device.BeginInvokeOnMainThread(cellController.SendDisappearing);
+				
 				_cell = value;
-				if (_cell != null)
-					Device.BeginInvokeOnMainThread(_cell.SendAppearing);
+				cellController = value;
+
+				if (cellController != null)
+					Device.BeginInvokeOnMainThread(cellController.SendAppearing);
 			}
 		}
 
diff --git a/Xamarin.Forms.Platform.iOS/Cells/EntryCellRenderer.cs b/Xamarin.Forms.Platform.iOS/Cells/EntryCellRenderer.cs
index 1af49b4a..e94e0ea5 100644
--- a/Xamarin.Forms.Platform.iOS/Cells/EntryCellRenderer.cs
+++ b/Xamarin.Forms.Platform.iOS/Cells/EntryCellRenderer.cs
@@ -82,7 +82,7 @@ namespace Xamarin.Forms.Platform.iOS
 		static void OnKeyBoardDoneButtonPressed(object sender, EventArgs e)
 		{
 			var cell = (EntryCellTableViewCell)sender;
-			var model = (EntryCell)cell.Cell;
+			var model = (IEntryCellController)cell.Cell;
 
 			model.SendCompleted();
 		}
diff --git a/Xamarin.Forms.Platform.iOS/Cells/ImageCellRenderer.cs b/Xamarin.Forms.Platform.iOS/Cells/ImageCellRenderer.cs
index ade59e82..010319ba 100644
--- a/Xamarin.Forms.Platform.iOS/Cells/ImageCellRenderer.cs
+++ b/Xamarin.Forms.Platform.iOS/Cells/ImageCellRenderer.cs
@@ -1,5 +1,6 @@
 using System.ComponentModel;
 using System.Threading.Tasks;
+using Xamarin.Forms.Internals;
 #if __UNIFIED__
 using UIKit;
 using Foundation;
diff --git a/Xamarin.Forms.Platform.iOS/Cells/ViewCellRenderer.cs b/Xamarin.Forms.Platform.iOS/Cells/ViewCellRenderer.cs
index 9493c8fb..f1cb2fb6 100644
--- a/Xamarin.Forms.Platform.iOS/Cells/ViewCellRenderer.cs
+++ b/Xamarin.Forms.Platform.iOS/Cells/ViewCellRenderer.cs
@@ -1,6 +1,7 @@
 using System;
 using System.ComponentModel;
-using System.Diagnostics;
+using Xamarin.Forms.Internals;
+
 #if __UNIFIED__
 using UIKit;
 #else
@@ -145,11 +146,14 @@ namespace Xamarin.Forms.Platform.iOS
 
 			void UpdateCell(ViewCell cell)
 			{
-				if (_viewCell != null)
-					Device.BeginInvokeOnMainThread(_viewCell.SendDisappearing);
+				ICellController cellController = _viewCell;
+				if (cellController != null)
+					Device.BeginInvokeOnMainThread(cellController.SendDisappearing);
 
 				_viewCell = cell;
-				Device.BeginInvokeOnMainThread(_viewCell.SendAppearing);
+				cellController = cell;
+
+				Device.BeginInvokeOnMainThread(cellController.SendAppearing);
 
 				IVisualElementRenderer renderer;
 				if (_rendererRef == null || !_rendererRef.TryGetTarget(out renderer))