✨ Raise GMImagePickerController.Canceled when the view is closed by pulling it down on iOS 13 (#75)

* This will raise GMImagePickerController.Canceled when the view is closed by pulling it down on iOS 13.

See #74

* Update nuget

Co-authored-by: Roy Cornelissen <[email protected]>

Author: ThomasHilbertAtCervis

src/GMImagePicker/GMImagePickerController.cs

@@ -47,8 +47,13 @@ public class GMImagePickerController: UIViewController
 		public static readonly CGSize PopoverContentSize = new CGSize(480, 720);
 
 		internal UINavigationController _navigationController;
-		private GMAlbumsViewController _albumsViewController;
-
+		private GMAlbumsViewController _albumsViewController;
+
+		/// <summary>
+		/// Inhibits raising of the Canceled event on ViewDidDisappear
+		/// </summary>
+		private bool _finishedPickingAssets;
+
 		/// <summary>
 		/// Contains the selected 'PHAsset' objects. The order of the objects is the selection order.
 		/// You can add assets before presenting the picker to show the user some preselected assets.
@@ -355,14 +360,14 @@ public void Dismiss (object sender, EventArgs args)
 			// Explicitly unregister observers because we cannot predict when the GC cleans up
 			Unregister ();
 
-			Canceled?.Invoke(this, EventArgs.Empty);
-
 			PresentingViewController?.DismissViewController (true, null);
 		}
 
 		public void FinishPickingAssets (object sender, EventArgs args)
 		{
-			// Explicitly unregister observers because we cannot predict when the GC cleans up
+			_finishedPickingAssets = true;
+
+			// Explicitly unregister observers because we cannot predict when the GC cleans up
 			Unregister ();
 
 			FinishedPickingAssets?.Invoke(this, new MultiAssetEventArgs(_selectedAssets.ToArray()));
@@ -688,7 +693,9 @@ public sealed override async void ViewWillAppear (bool animated)
 				await _viewDidLoadAsyncTask;
 				base.ViewWillAppear (animated);
 
-				// Ensure nav and toolbar customisations are set. Defaults are in place, but the user may have changed them
+				_finishedPickingAssets = false;
+
+				// Ensure nav and toolbar customisations are set. Defaults are in place, but the user may have changed them
 				View.BackgroundColor = PickerBackgroundColor;
 
 				_navigationController.Toolbar.Translucent = true;
@@ -720,7 +727,15 @@ public sealed override async void ViewWillAppear (bool animated)
 				//Handle
 			}
 		}
-
+
+		public override void ViewDidDisappear(bool animated)
+		{
+			base.ViewDidDisappear(animated);
+
+			if ((IsBeingDismissed || IsMovingFromParentViewController) && !_finishedPickingAssets)
+				Canceled?.Invoke(this, EventArgs.Empty);
+		}
+
 		/// <summary>
 		/// Checks if access to the Camera is granted, and if not (Denied), shows an error message.
 		/// </summary>

src/GMPhotoPicker.Xamarin.UITests/GMPhotoPicker.Xamarin.UITests.csproj

@@ -35,7 +35,7 @@
       <HintPath>..\packages\NUnit.3.12.0\lib\net45\nunit.framework.dll</HintPath>
     </Reference>
     <Reference Include="Xamarin.UITest">
-      <HintPath>..\packages\Xamarin.UITest.3.0.4\lib\net45\Xamarin.UITest.dll</HintPath>
+      <HintPath>..\packages\Xamarin.UITest.3.0.7\lib\net45\Xamarin.UITest.dll</HintPath>
     </Reference>
   </ItemGroup>
   <ItemGroup>

src/GMPhotoPicker.Xamarin.UITests/packages.config

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="NUnit" version="3.12.0" targetFramework="net45" />
-  <package id="Xamarin.UITest" version="3.0.4" targetFramework="net45" />
+  <package id="Xamarin.UITest" version="3.0.7" targetFramework="net45" />
 </packages>