Added code snippets

snippets/ActivityIndicator-Snippet.txt

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+public interface IActivityIndicator : IView
+{
+    bool IsRunning { get; }
+    Color Color { get; }
+}
+     
+public partial class ActivityIndicator : IActivityIndicator
+{
+
+}
+
+public class ActivityIndicator : Xamarin.Forms.View, IActivityIndicator
+{
+    public bool IsRunning { get; set; } = true;
+
+    public Color Color { get; set; }
+}
+
+public partial class ActivityIndicatorHandler
+{
+    public static PropertyMapper<IActivityIndicator, ActivityIndicatorHandler> ActivityIndicatorMapper = new PropertyMapper<IActivityIndicator, ActivityIndicatorHandler>(ViewHandler.ViewMapper)
+    {
+        [nameof(IActivityIndicator.IsRunning)] = MapIsRunning,
+        [nameof(IActivityIndicator.Color)] = MapColor
+    };
+
+    public static void MapIsRunning(ActivityIndicatorHandler handler, IActivityIndicator activityIndicator)
+    {
+        ViewHandler.CheckParameters(handler, activityIndicator);
+        handler.TypedNativeView?.UpdateIsRunning(activityIndicator);
+    }
+
+    public static void MapColor(ActivityIndicatorHandler handler, IActivityIndicator activityIndicator)
+    {
+        ViewHandler.CheckParameters(handler, activityIndicator);
+        handler.TypedNativeView?.UpdateColor(activityIndicator);
+    }
+
+    public ActivityIndicatorHandler() : base(ActivityIndicatorMapper)
+    {
+
+    }
+
+    public ActivityIndicatorHandler(PropertyMapper mapper) : base(mapper ?? ActivityIndicatorMapper)
+    {
+
+    }
+}
+
+public partial class ActivityIndicatorHandler : AbstractViewHandler<IActivityIndicator, ProgressBar>
+{
+    protected override ProgressBar CreateNativeView() => new ProgressBar(Context) { Indeterminate = true };
+}
+	
+public partial class ActivityIndicatorHandler : AbstractViewHandler<IActivityIndicator, UIActivityIndicatorView>
+{
+    protected override UIActivityIndicatorView CreateNativeView() => new UIActivityIndicatorView(CGRect.Empty)
+    {
+        ActivityIndicatorViewStyle = UIActivityIndicatorViewStyle.Gray
+    };
+}
+
+public static class ActivityIndicatorExtensions
+{
+    public static void UpdateIsRunning(this ProgressBar progressBar, IActivityIndicator activityIndicator) =>
+    progressBar.Visibility = activityIndicator.IsRunning ? ViewStates.Visible : ViewStates.Invisible;
+
+    public static void UpdateColor(this ProgressBar progressBar, IActivityIndicator activityIndicator)
+    {
+        Color color = activityIndicator.Color;
+
+        if (!color.IsDefault)
+            progressBar.IndeterminateDrawable?.SetColorFilter(color.ToNative(), FilterMode.SrcIn);
+        else
+            progressBar.IndeterminateDrawable?.ClearColorFilter();
+    }
+}	
+
+public static class ActivityIndicatorExtensions
+{
+    public static void UpdateIsRunning(this UIActivityIndicatorView activityIndicatorView, IActivityIndicator activityIndicator)
+    {
+        if (activityIndicator.IsRunning)
+            activityIndicatorView.StartAnimating();
+        else
+            activityIndicatorView.StopAnimating();
+    }
+
+    public static void UpdateColor(this UIActivityIndicatorView activityIndicatorView, IActivityIndicator activityIndicator)
+    {
+        activityIndicatorView.Color = activityIndicator.Color == Color.Default ? null : activityIndicator.Color.ToNative();
+    }
+}
+
+RegistrarHandlers.Handlers.Register<ActivityIndicator, ActivityIndicatorHandler>();

snippets/CustomButton-Snippet.txt

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+using Xamarin.Forms;
+using Xamarin.Platform;
+using Xamarin.Platform.Handlers;
+using RegistrarHandlers = Xamarin.Platform.Registrar;
+
+namespace Sample
+{
+	public class CustomButton : Button
+	{
+		public CustomButton()
+		{
+			RegistrarHandlers.Handlers.Register<CustomButton, ButtonHandler>();
+
+			ButtonHandler.ButtonMapper[nameof(IButton.BackgroundColor)] = (handler, view) =>
+			{
+				if (view is CustomButton customButton)
+				{
+#if __IOS__
+				var nativeButton = handler.NativeView as UIKit.UIButton;
+
+				nativeButton.BackgroundColor = UIKit.UIColor.Red;
+#endif
+				}
+
+				ViewHandler.MapBackgroundColor(handler, view);
+			};
+
+			ButtonHandler.ButtonMapper[nameof(ShadowColor)] = (handler, view) =>
+			{
+				if (view is CustomButton customButton)
+				{
+#if __IOS__
+					var nativeButton = handler.NativeView as UIKit.UIButton;
+
+					nativeButton.Layer.ShadowColor = ShadowColor.ToCGColor();
+					nativeButton.Layer.ShadowOpacity = 1;
+					nativeButton.Layer.ShadowOffset = CoreGraphics.CGSize.Empty;
+					nativeButton.Layer.ShadowRadius = 10;
+#endif
+				}
+			};
+		}
+
+		public Color ShadowColor { get; set; }
+	}
+}

snippets/Handler-Snippet.txt

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+ButtonHandler.ButtonMapper["MyCustomProperty"] = (handler, view) =>
+{
+    var nativeView = handler.NativeView;
+};
+
+ButtonHandler.ButtonMapper[nameof(IButton.BackgroundColor)] = (handler, view) =>
+{
+#if __IOS__
+     var nativeButton = handler.NativeView as UIKit.UIButton;
+
+     nativeButton.BackgroundColor = UIKit.UIColor.Blue;
+
+#else
+     ViewHandler.MapBackgroundColor(handler, view);
+#endif
+};
+
+SliderHandler.SliderMapper[nameof(ISlider.ThumbColor)] = (handler, view) =>
+{
+#if __IOS__
+     var nativeSlider = handler.NativeView as UIKit.UISlider;
+     nativeSlider.UpdateBackgroundColor(view);
+#endif
+};