Add methods for aligning view edges to the center of other views.

Author: Tyron18

Cirrious.FluentLayout/AdvancedFluentLayoutExtensions.cs

@@ -110,7 +110,19 @@ public static FluentLayout ToTopMargin(this UIView view, UIView previous) =>
 			view.Top().EqualTo().TopMarginOf(previous);
 
 		public static FluentLayout ToBottomMargin(this UIView view, UIView previous) =>
-			view.Bottom().EqualTo().BottomMarginOf(previous);			
+			view.Bottom().EqualTo().BottomMarginOf(previous);
+	    
+	public static FluentLayout ToLeftOfCenterOf(this UIView view, UIView previous, nfloat? margin = null) =>
+		view.Right().EqualTo().CenterXOf(previous).Minus(margin.GetValueOrDefault(0));
+	    
+	public static FluentLayout ToRightOfCenterOf(this UIView view, UIView previous, nfloat? margin = null) =>
+		view.Left().EqualTo().CenterXOf(previous).Minus(margin.GetValueOrDefault(0));
+	    
+	public static FluentLayout AboveCenterOf(this UIView view, UIView previous, nfloat? margin = null) =>
+		view.Bottom().EqualTo().CenterYOf(previous).Minus(margin.GetValueOrDefault(0));
+	    
+	public static FluentLayout BelowCenterOf(this UIView view, UIView previous, nfloat? margin = null) =>
+		view.Top().EqualTo().CenterYOf(previous).Minus(margin.GetValueOrDefault(0));
 
         public static IEnumerable<FluentLayout> FullWidthOf(this UIView view, UIView parent, nfloat? margin = null)
         {