fix for stuck extension sheets when dismissed by swipe (#1117)

* fix for stuck extension sheets when dismissed by swipe

* simplify dismiss action assignments

src/iOS.Core/Controllers/ExtendedUITableViewController.cs

@@ -6,6 +6,8 @@ namespace Bit.iOS.Core.Controllers
 {
     public class ExtendedUITableViewController : UITableViewController
     {
+        public Action DismissModalAction { get; set; }
+        
         public ExtendedUITableViewController(IntPtr handle)
             : base(handle)
         {

src/iOS.Core/Controllers/ExtendedUIViewController.cs

@@ -6,6 +6,8 @@ namespace Bit.iOS.Core.Controllers
 {
     public class ExtendedUIViewController : UIViewController
     {
+        public Action DismissModalAction { get; set; }
+        
         public ExtendedUIViewController(IntPtr handle)
             : base(handle)
         {

src/iOS.Core/Views/CustomPresentationControllerDelegate.cs

@@ -0,0 +1,22 @@
+using System;
+using Foundation;
+using UIKit;
+
+namespace Bit.iOS.Core.Views
+{
+    public class CustomPresentationControllerDelegate : UIAdaptivePresentationControllerDelegate
+    {
+        private readonly Action DismissModalAction;
+
+        public CustomPresentationControllerDelegate(Action dismissModalAction)
+        {
+            DismissModalAction = dismissModalAction;
+        }
+
+        [Export("presentationControllerDidDismiss:")]
+        public override void DidDismiss(UIPresentationController presentationController)
+        {
+            DismissModalAction?.Invoke();
+        }
+    }
+}

src/iOS.Core/iOS.Core.csproj

@@ -175,6 +175,7 @@
     <Compile Include="Utilities\iOSCoreHelpers.cs" />
     <Compile Include="Utilities\iOSHelpers.cs" />
     <Compile Include="Utilities\ThemeHelpers.cs" />
+    <Compile Include="Views\CustomPresentationControllerDelegate.cs" />
     <Compile Include="Views\ExtensionSearchDelegate.cs" />
     <Compile Include="Views\ExtensionTableSource.cs" />
     <Compile Include="Views\FormEntryTableViewCell.cs" />