1 files changed, 99 insertions, 0 deletions
diff --git a/Xamarin.Forms.Platform.iOS/Renderers/SliderRenderer.cs b/Xamarin.Forms.Platform.iOS/Renderers/SliderRenderer.cs
new file mode 100644
index 00000000..2df61f2f
--- /dev/null
+++ b/Xamarin.Forms.Platform.iOS/Renderers/SliderRenderer.cs
@@ -0,0 +1,99 @@
+using System;
+using System.Drawing;
+using System.ComponentModel;
+#if __UNIFIED__
+using UIKit;
+#else
+using MonoTouch.UIKit;
+#endif
+#if __UNIFIED__
+using RectangleF = CoreGraphics.CGRect;
+using SizeF = CoreGraphics.CGSize;
+using PointF = CoreGraphics.CGPoint;
+
+#else
+using nfloat=System.Single;
+using nint=System.Int32;
+using nuint=System.UInt32;
+#endif
+
+namespace Xamarin.Forms.Platform.iOS
+{
+	public class SliderRenderer : ViewRenderer<Slider, UISlider>
+	{
+		SizeF _fitSize;
+
+		public override SizeF SizeThatFits(SizeF size)
+		{
+			return _fitSize;
+		}
+
+		protected override void Dispose(bool disposing)
+		{
+			if (Control != null)
+				Control.ValueChanged -= OnControlValueChanged;
+
+			base.Dispose(disposing);
+		}
+
+		protected override void OnElementChanged(ElementChangedEventArgs<Slider> e)
+		{
+			if (e.NewElement != null)
+			{
+				if (Control == null)
+				{
+					SetNativeControl(new UISlider { Continuous = true });
+					Control.ValueChanged += OnControlValueChanged;
+
+					// sliders SizeThatFits method returns non-useful answers
+					// this however gives a very useful answer
+					Control.SizeToFit();
+					_fitSize = Control.Bounds.Size;
+
+					// except if your not running iOS 7... then it fails...
+					if (_fitSize.Width <= 0 || _fitSize.Height <= 0)
+						_fitSize = new SizeF(22, 22); // Per the glorious documentation known as the SDK docs
+				}
+
+				UpdateMaximum();
+				UpdateMinimum();
+				UpdateValue();
+			}
+
+			base.OnElementChanged(e);
+		}
+
+		protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
+		{
+			base.OnElementPropertyChanged(sender, e);
+
+			if (e.PropertyName == Slider.MaximumProperty.PropertyName)
+				UpdateMaximum();
+			else if (e.PropertyName == Slider.MinimumProperty.PropertyName)
+				UpdateMinimum();
+			else if (e.PropertyName == Slider.ValueProperty.PropertyName)
+				UpdateValue();
+		}
+
+		void OnControlValueChanged(object sender, EventArgs eventArgs)
+		{
+			((IElementController)Element).SetValueFromRenderer(Slider.ValueProperty, Control.Value);
+		}
+
+		void UpdateMaximum()
+		{
+			Control.MaxValue = (float)Element.Maximum;
+		}
+
+		void UpdateMinimum()
+		{
+			Control.MinValue = (float)Element.Minimum;
+		}
+
+		void UpdateValue()
+		{
+			if ((float)Element.Value != Control.Value)
+				Control.Value = (float)Element.Value;
+		}
+	}
+}
+\ No newline at end of file