1 files changed, 29 insertions, 0 deletions
diff --git a/Xamarin.Forms.Platform.iOS/NativeViewPropertyListener.cs b/Xamarin.Forms.Platform.iOS/NativeViewPropertyListener.cs
new file mode 100644
index 00000000..ffe117f4
--- /dev/null
+++ b/Xamarin.Forms.Platform.iOS/NativeViewPropertyListener.cs
@@ -0,0 +1,29 @@
+using System;
+using System.ComponentModel;
+#if __UNIFIED__
+using Foundation;
+
+#else
+using MonoTouch.Foundation;
+#endif
+
+namespace Xamarin.Forms.Platform.iOS
+{
+	class NativeViewPropertyListener : NSObject, INotifyPropertyChanged
+	{
+		string TargetProperty { get; set; }
+
+		public NativeViewPropertyListener(string targetProperty)
+		{
+			TargetProperty = targetProperty;
+		}
+
+		public event PropertyChangedEventHandler PropertyChanged;
+
+		public override void ObserveValue(NSString keyPath, NSObject ofObject, NSDictionary change, IntPtr context)
+		{
+			if (keyPath == TargetProperty)
+				PropertyChanged?.Invoke(ofObject, new PropertyChangedEventArgs(TargetProperty));
+		}
+	}
+}