[iOS] If stroke is null avoid render shape stroke

Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Issue14286.xaml

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<local:TestContentPage
+    xmlns="http://xamarin.com/schemas/2014/forms"
+    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+    xmlns:d="http://xamarin.com/schemas/2014/forms/design"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    mc:Ignorable="d"
+    Title="Test 14286" xmlns:local="using:Xamarin.Forms.Controls"
+    x:Class="Xamarin.Forms.Controls.Issues.Issue14286">
+    <StackLayout>
+        <Label
+            Padding="12"
+            BackgroundColor="Black"
+            TextColor="White"
+            Text="If the Ellipse border is empty, the test has passed."/>
+        <StackLayout
+            Padding="12">   
+            <Ellipse
+                HeightRequest="100"
+                WidthRequest="100"
+                HorizontalOptions="Center"
+                Fill="Orange"/>
+        </StackLayout>
+    </StackLayout>
+</local:TestContentPage>

Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Issue14286.xaml.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using Xamarin.Forms.CustomAttributes;
+using System.Threading.Tasks;
+
+#if UITEST
+using Xamarin.UITest;
+using NUnit.Framework;
+using Xamarin.Forms.Core.UITests;
+#endif
+
+namespace Xamarin.Forms.Controls.Issues
+{
+	[Issue(IssueTracker.Github, 14286,
+		"[Bug] ShapesAPI-based Circle shape has a border by default in iOS while it doesn't have a border in Android",
+		PlatformAffected.Android)]
+	public partial class Issue14286 : TestContentPage
+	{
+		public Issue14286()
+		{
+#if APP
+			InitializeComponent();
+#endif
+		}
+
+		protected override void Init()
+		{
+		}
+	}
+}

Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Xamarin.Forms.Controls.Issues.Shared.projitems

@@ -1767,6 +1767,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)Issue12590.xaml.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Issue13726.xaml.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Issue11795.xaml.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Issue14286.xaml.cs" />
   </ItemGroup>
   <ItemGroup>
     <EmbeddedResource Include="$(MSBuildThisFileDirectory)Bugzilla22229.xaml">
@@ -2211,6 +2212,9 @@
     <EmbeddedResource Include="$(MSBuildThisFileDirectory)Issue11795.xaml">
       <Generator>MSBuild:UpdateDesignTimeXaml</Generator>
     </EmbeddedResource>
+    <EmbeddedResource Include="$(MSBuildThisFileDirectory)Issue14286.xaml">
+      <Generator>MSBuild:UpdateDesignTimeXaml</Generator>
+    </EmbeddedResource>
   </ItemGroup>
   <ItemGroup>
     <EmbeddedResource Include="$(MSBuildThisFileDirectory)Bugzilla27417Xaml.xaml">

Xamarin.Forms.Platform.iOS/Shapes/ShapeRenderer.cs

@@ -474,7 +474,7 @@ void RenderShape(CGContext graphics)
             CATransaction.Begin();
             CATransaction.DisableActions = true;
 
-            graphics.SetLineWidth(_strokeWidth);
+            graphics.SetLineWidth(_stroke != null ? _strokeWidth : 0);
             graphics.SetLineDash(_dashOffset * _strokeWidth, _strokeDash);
             graphics.SetLineCap(_strokeLineCap);
             graphics.SetLineJoin(_strokeLineJoin);