1 files changed, 84 insertions, 0 deletions
diff --git a/Xamarin.Forms.Platform.MacOS/Renderers/StepperRenderer.cs b/Xamarin.Forms.Platform.MacOS/Renderers/StepperRenderer.cs
new file mode 100644
index 00000000..f28bf1f7
--- /dev/null
+++ b/Xamarin.Forms.Platform.MacOS/Renderers/StepperRenderer.cs
@@ -0,0 +1,84 @@
+using System;
+using System.ComponentModel;
+using AppKit;
+
+namespace Xamarin.Forms.Platform.MacOS
+{
+	public class StepperRenderer : ViewRenderer<Stepper, NSStepper>
+	{
+		bool _disposed;
+
+		IElementController ElementController => Element;
+
+		protected override void OnElementChanged(ElementChangedEventArgs<Stepper> e)
+		{
+			if (e.NewElement != null)
+			{
+				if (Control == null)
+				{
+					SetNativeControl(new NSStepper());
+					Control.Activated += OnControlActivated;
+				}
+
+				UpdateMinimum();
+				UpdateMaximum();
+				UpdateValue();
+				UpdateIncrement();
+			}
+
+			base.OnElementChanged(e);
+		}
+
+		protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
+		{
+			base.OnElementPropertyChanged(sender, e);
+
+			if (e.PropertyName == Stepper.MinimumProperty.PropertyName)
+				UpdateMinimum();
+			else if (e.PropertyName == Stepper.MaximumProperty.PropertyName)
+				UpdateMaximum();
+			else if (e.PropertyName == Stepper.ValueProperty.PropertyName)
+				UpdateValue();
+			else if (e.PropertyName == Stepper.IncrementProperty.PropertyName)
+				UpdateIncrement();
+		}
+
+		protected override void Dispose(bool disposing)
+		{
+			if (disposing && !_disposed)
+			{
+				_disposed = true;
+				if (Control != null)
+					Control.Activated -= OnControlActivated;
+			}
+
+			base.Dispose(disposing);
+		}
+
+		void OnControlActivated(object sender, EventArgs e)
+		{
+			ElementController?.SetValueFromRenderer(Stepper.ValueProperty, Control.DoubleValue);
+		}
+
+		void UpdateIncrement()
+		{
+			Control.Increment = Element.Increment;
+		}
+
+		void UpdateMaximum()
+		{
+			Control.MaxValue = Element.Maximum;
+		}
+
+		void UpdateMinimum()
+		{
+			Control.MinValue = Element.Minimum;
+		}
+
+		void UpdateValue()
+		{
+			if (Math.Abs(Control.DoubleValue - Element.Value) > 0)
+				Control.DoubleValue = Element.Value;
+		}
+	}
+}
+\ No newline at end of file