[iOS] Prevent multiple ListView cells from being swiped simultaneously (#578)

* disable multiple cell swipe

* add sample code

* refactored

* convert to weakreference

* remove null setting

* change weakreference setting place

* remove if

* revert isopen changes

* add instructions

2 files changed, 62 insertions, 0 deletions

diff --git a/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Bugzilla43735.cs b/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Bugzilla43735.cs
new file mode 100644
index 00000000..5f247eaf
--- /dev/null
+++ b/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Bugzilla43735.cs
@@ -0,0 +1,61 @@
+using System.Collections.Generic;
+using Xamarin.Forms.CustomAttributes;
+using Xamarin.Forms.Internals;
+
+#if UITEST
+using Xamarin.UITest;
+using NUnit.Framework;
+#endif
+
+namespace Xamarin.Forms.Controls.Issues
+{
+	[Preserve(AllMembers = true)]
+	[Issue(IssueTracker.Bugzilla, 43735, "Multiple Swipe on ContextActions", PlatformAffected.iOS)]
+	public class Bugzilla43735 : TestContentPage // or TestMasterDetailPage, etc ...
+	{
+		protected override void Init()
+		{
+			var stackLayout = new StackLayout();
+
+			var l = new Label
+			{
+				Text = "Swipe multiple cells at the same time. Only one cell should show its context actions."
+			};
+			stackLayout.Children.Add(l);
+
+			var list = new List<int>();
+			for (var i = 0; i < 20; i++)
+				list.Add(i);
+
+			var listView = new ListView
+			{
+				ItemsSource = list,
+				ItemTemplate = new DataTemplate(() =>
+				{
+					var label = new Label();
+					label.SetBinding(Label.TextProperty, new Binding("."));
+
+					return new ViewCell
+					{
+						View = new ContentView
+						{
+							Content = label,
+						},
+						ContextActions = { new MenuItem
+						{
+							Text = "Action"
+						},
+						new MenuItem
+						{
+							Text = "Delete",
+							IsDestructive = true
+						} }
+					};
+				})
+			};
+			stackLayout.Children.Add(listView);
+
+			Content = stackLayout;
+		}
+	}
+}
\ No newline at end of file
diff --git a/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Xamarin.Forms.Controls.Issues.Shared.projitems b/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Xamarin.Forms.Controls.Issues.Shared.projitems
index c5d93821..4820bae3 100644
--- a/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Xamarin.Forms.Controls.Issues.Shared.projitems
+++ b/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Xamarin.Forms.Controls.Issues.Shared.projitems
@@ -139,6 +139,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla43469.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla43516.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla43663.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Bugzilla43735.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla44453.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla44944.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla44166.cs" />