[uikit] Add UIContentSizeCategoryCompareToCategory & UIContentSizeCat… (#2805)

- Fixes bug #59422: https://bugzilla.xamarin.com/show_bug.cgi?id=59422)

src/UIKit/UIContentSizeCategory.cs

@@ -0,0 +1,46 @@
+#if !WATCH
+
+using System;
+using System.Runtime.InteropServices;
+
+using XamCore.ObjCRuntime;
+using XamCore.Foundation;
+
+namespace XamCore.UIKit {
+	static public partial class UIContentSizeCategoryExtensions {
+
+		[iOS (11, 0), TV (11, 0)]
+		[DllImport (Constants.UIKitLibrary)]
+		static extern nint /* NSComparisonResult */ UIContentSizeCategoryCompareToCategory (IntPtr /* NSString */ lhs, IntPtr /* NSString */ rhs);
+
+		[iOS (11, 0), TV (11, 0)]
+		public static NSComparisonResult Compare (UIContentSizeCategory category1, UIContentSizeCategory category2)
+		{
+			var c1 = category1.GetConstant ();
+			if (c1 == null)
+				throw new ArgumentException ($"Unknown 'UIContentSizeCategory' value", nameof (category1));
+
+			var c2 = category2.GetConstant ();
+			if (c2 == null)
+				throw new ArgumentException ($"Unknown 'UIContentSizeCategory' value", nameof (category2));
+
+			return (NSComparisonResult)(long)UIContentSizeCategoryCompareToCategory (c1.Handle, c2.Handle);
+		}
+
+		[iOS (11, 0), TV (11, 0)]
+		[DllImport (Constants.UIKitLibrary)]
+		static extern bool UIContentSizeCategoryIsAccessibilityCategory (IntPtr /* NSString */ category);
+
+		[iOS (11, 0), TV (11, 0)]
+		static public bool IsAccessibilityCategory (this UIContentSizeCategory self)
+		{
+			var c1 = self.GetConstant ();
+			if (c1 == null)
+				throw new ArgumentException ($"Unknown 'UIContentSizeCategory' value");
+
+			return UIContentSizeCategoryIsAccessibilityCategory (c1.Handle);
+		}
+	}
+}
+
+#endif // !WATCH

src/frameworks.sources

@@ -1360,6 +1360,7 @@ UIKIT_SOURCES = \
 	UIKit/UICollectionViewLayoutAttributes.cs \
 	UIKit/UICollectionViewTransitionLayout.cs \
 	UIKit/UIColor.cs \
+	UIKit/UIContentSizeCategory.cs \
 	UIKit/UIControl.cs \
 	UIKit/UIDevice.cs \
 	UIKit/UIDocumentInteractionController.cs \

tests/monotouch-test/UIKit/UIContentSizeCategoryTest.cs

@@ -0,0 +1,51 @@
+//
+// Unit tests for UIContentSizeCategory
+//
+// Authors:
+//	Vincent Dondain <vidondai@microsoft.com>
+//
+// Copyright 2017 Microsoft. All rights reserved.
+//
+
+#if !__WATCHOS__
+
+using System;
+using Foundation;
+using NUnit.Framework;
+using UIKit;
+
+namespace MonoTouchFixtures.UIKit {
+
+	[TestFixture]
+	[Preserve (AllMembers = true)]
+	public class UIContentSizeCategoryTest {
+
+		[SetUp]
+		public void Setup ()
+		{
+			TestRuntime.AssertXcodeVersion (9, 0);
+		}
+
+		[Test]
+		public void IsAccessibilityCategory ()
+		{
+			var isAccessible = UIContentSizeCategory.AccessibilityMedium.IsAccessibilityCategory ();
+			Assert.IsTrue (isAccessible, "AccessibilityMedium");
+			isAccessible = UIContentSizeCategory.Medium.IsAccessibilityCategory ();
+			Assert.IsFalse (isAccessible, "Medium");
+		}
+
+		[Test]
+		public void Compare ()
+		{
+			var small = UIContentSizeCategory.Small;
+			var large = UIContentSizeCategory.Large;
+			Assert.True (UIContentSizeCategoryExtensions.Compare (small, large) == NSComparisonResult.Ascending, "small < large");
+			Assert.Throws<ArgumentException> (() => UIContentSizeCategoryExtensions.Compare ((UIContentSizeCategory)31415, large));
+			Assert.Throws<ArgumentException> (() => UIContentSizeCategoryExtensions.Compare (small, (UIContentSizeCategory)271828));
+			Assert.Throws<ArgumentException> (() => ((UIContentSizeCategory)1234).IsAccessibilityCategory ());
+		}
+	}
+}
+
+#endif // !__WATCHOS__

tests/monotouch-test/monotouch-test.csproj

@@ -700,6 +700,7 @@
     <Compile Include="Metal\MTLTileRenderPipelineDescriptor.cs" />
     <Compile Include="Metal\MTLTileRenderPipelineColorAttachmentDescriptorTests.cs" />
     <Compile Include="AVFoundation\AVDepthDataTests.cs" />
+    <Compile Include="UIKit\UIContentSizeCategoryTest.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildExtensionsPath)\Xamarin\iOS\Xamarin.iOS.CSharp.targets" />
   <ItemGroup>