diff --git a/docs/api/UIKit/NSLayoutConstraint.xml b/docs/api/UIKit/NSLayoutConstraint.xml
index 23cd25c31edf..ad03150f3679 100644
--- a/docs/api/UIKit/NSLayoutConstraint.xml
+++ b/docs/api/UIKit/NSLayoutConstraint.xml
@@ -31,25 +31,6 @@ var tconstraint1 = NSLayoutConstraint.Create (toolbar, NSLayoutAttribute.Width,
     </remarks>
     <related type="externalDocumentation" href="https://developer.apple.com/library/ios/documentation/AppKit/Reference/NSLayoutConstraint_Class/index.html">Apple documentation for <c>NSLayoutConstraint</c></related>
   </Docs>
-  <Docs DocId="M:UIKit.NSLayoutConstraint.FromVisualFormat(System.String,UIKit.NSLayoutFormatOptions,System.Object[])">
-    <param name="format">Visual format to use to create the constraints.</param>
-    <param name="formatOptions">options.</param>
-    <param name="viewsAndMetrics">
-      <para>Pairs of names and values.   The names should be strings (or NSStrings) and the values should be either UIViews, numbers (any C# number or NSNumber) or <see cref="ObjCRuntime.INativeObject" /> instances that are suitable to be passed to the underlying engine. </para>
-      <para>
-      </para>
-      <para> This binds the provided name with the view or binds the name with the number as a metric.</para>
-    </param>
-    <summary>Factory method for creating a constraint using Visual Format Language.</summary>
-    <returns>An array of layout constraints that are suitable to be added to a <see cref="View" /> using <see cref="View.AddConstraints(NSLayoutConstraint[])" /> method.</returns>
-    <remarks>
-      <example>
-        <code lang="csharp lang-csharp"><![CDATA[
-NSLayoutConstraint.FromVisualFormat ("|-8-[messageView]-8-|", NSLayoutOptions.None, "messageView", MakeMessageView ());
-	    ]]></code>
-      </example>
-    </remarks>
-  </Docs>
   <Docs DocId="M:UIKit.NSLayoutConstraint.ActivateConstraints(UIKit.NSLayoutConstraint[])">
     <param name="constraints">Constraints to activate.</param>
     <summary>Activates all of the constraints passed.</summary>
@@ -93,32 +74,6 @@ NSLayoutConstraint.ActivateConstraints(blueConstraints);
       <para>It is easier to use the <see cref="NSLayoutConstraint.FromVisualFormat(System.String,NSLayoutFormatOptions,System.Object[])" /> overload as it combines support for both metrics and views in a single call.</para>
     </remarks>
   </Docs>
-  <Docs DocId="M:UIKit.NSLayoutConstraint.Create(Foundation.NSObject,UIKit.NSLayoutAttribute,UIKit.NSLayoutRelation,Foundation.NSObject,UIKit.NSLayoutAttribute,System.Runtime.InteropServices.NFloat,System.Runtime.InteropServices.NFloat)">
-        <param name="view1">First view in the constraint.</param>
-        <param name="attribute1">Attribute for the first view.</param>
-        <param name="relation">Relationships between the <paramref name="view1" /> and the <paramref name="view2" />.</param>
-        <param name="view2">
-          <para>Second view in the constraint.</para>
-          <para>This parameter can be <see langword="null" />.</para>
-          <para tool="nullallowed">This parameter can be <see langword="null" />.</para>
-        </param>
-        <param name="attribute2">Attribute for the second view.</param>
-        <param name="multiplier">Multiplier applied to the second attribute.</param>
-        <param name="constant">Constants to add.</param>
-        <summary>Factory method for creating a constraint.</summary>
-        <returns>
-          <para>New constraint with the specified parameters.</para>
-          <para>
-          </para>
-        </returns>
-        <remarks>
-          <para>Creates a constraint relationship between the <paramref name="view1" /> and the <paramref name="view2" /> that satisfies the following linear equation:</para>
-          <para>
-          </para>
-          <para>
-            <paramref name="attribute1" /> = <paramref name="multiplier" /> x <paramref name="attribute2" /> + <paramref name="constant" /></para>
-        </remarks>
-      </Docs>
   <Docs DocId="M:UIKit.NSLayoutConstraint.Create(ObjCRuntime.INativeObject,UIKit.NSLayoutAttribute,UIKit.NSLayoutRelation,ObjCRuntime.INativeObject,UIKit.NSLayoutAttribute,System.Runtime.InteropServices.NFloat,System.Runtime.InteropServices.NFloat)">
         <param name="view1">First view in the constraint.</param>
         <param name="attribute1">Attribute for the first view.</param>
diff --git a/src/Foundation/NSLayoutConstraint.cs b/src/Foundation/NSLayoutConstraint.cs
index 0361bd73c801..fac7a430c1aa 100644
--- a/src/Foundation/NSLayoutConstraint.cs
+++ b/src/Foundation/NSLayoutConstraint.cs
@@ -1,10 +1,10 @@
 //
-// Helper functions to make FromVisualLayout more palattable
+// Helper functions to make FromVisualFormat more palatable
 //
 // Author:
 //   Miguel de Icaza
 //
-// Copyright 2014 Xamarin INc
+// Copyright 2014 Xamarin Inc
 //
 
 #if MONOMAC
@@ -13,8 +13,7 @@
 using View = UIKit.UIView;
 #endif
 
-// Disable until we get around to enable + fix any issues.
-#nullable disable
+#nullable enable
 
 #if MONOMAC
 namespace AppKit
@@ -23,7 +22,7 @@ namespace UIKit
 #endif
 {
 	public partial class NSLayoutConstraint {
-		static NSNumber AsNumber (object o)
+		static NSNumber? AsNumber (object o)
 		{
 			if (o is NSNumber) return (NSNumber) o;
 			if (o is double) return new NSNumber ((double) o);
@@ -42,10 +41,26 @@ static NSNumber AsNumber (object o)
 			return null;
 		}
 
-		/// <include file="../../docs/api/UIKit/NSLayoutConstraint.xml" path="/Documentation/Docs[@DocId='M:UIKit.NSLayoutConstraint.FromVisualFormat(System.String,UIKit.NSLayoutFormatOptions,System.Object[])']/*" />
+		/// <summary>Factory method for creating a constraint using Visual Format Language.</summary>
+		/// <param name="format">Visual format to use to create the constraints.</param>
+		/// <param name="formatOptions">Options for the format.</param>
+		/// <param name="viewsAndMetrics">
+		///   <para>Pairs of names and values. The names should be strings (or <see cref="Foundation.NSString" />) and the values should be either <see cref="View" />s, numbers (any C# number or <see cref="Foundation.NSNumber" />) or <see cref="ObjCRuntime.INativeObject" /> instances that are suitable to be passed to the underlying engine.</para>
+		///   <para>This binds the provided name with the view or binds the name with the number as a metric.</para>
+		/// </param>
+		/// <returns>An array of layout constraints that are suitable to be added to a <see cref="View" /> using the <see cref="View.AddConstraints" /> method.</returns>
+		/// <remarks>
+		///   <example>
+		///     <code lang="csharp lang-csharp"><![CDATA[
+		/// NSLayoutConstraint.FromVisualFormat ("|-8-[messageView]-8-|", NSLayoutFormatOptions.None, "messageView", MakeMessageView ());
+		/// ]]></code>
+		///   </example>
+		/// </remarks>
 		static public NSLayoutConstraint [] FromVisualFormat (string format, NSLayoutFormatOptions formatOptions, params object [] viewsAndMetrics)
 		{
-			NSMutableDictionary views = null, metrics = null;
+			ArgumentNullException.ThrowIfNull (format);
+			ArgumentNullException.ThrowIfNull (viewsAndMetrics);
+			NSMutableDictionary? views = null, metrics = null;
 			var count = viewsAndMetrics.Length;
 			if (count != 0) {
 				if ((count % 2) != 0)
@@ -102,60 +117,60 @@ static public NSLayoutConstraint [] FromVisualFormat (string format, NSLayoutFor
 			return FromVisualFormat (format, formatOptions, metrics, views);
 		}
 
-		/// <param name="view1">To be added.</param>
-		/// <param name="attribute1">To be added.</param>
-		/// <param name="relation">To be added.</param>
-		/// <param name="multiplier">To be added.</param>
-		/// <param name="constant">To be added.</param>
-		/// <summary>Static factory method for creating a constraint.</summary>
-		/// <returns>To be added.</returns>
-		/// <remarks>To be added.</remarks>
+		/// <summary>Factory method for creating a constraint.</summary>
+		/// <param name="view1">The view or object in the constraint.</param>
+		/// <param name="attribute1">The attribute for the view.</param>
+		/// <param name="relation">The relationship in the constraint.</param>
+		/// <param name="multiplier">The multiplier applied to the attribute.</param>
+		/// <param name="constant">The constant value in the constraint.</param>
+		/// <returns>A new constraint with the specified parameters.</returns>
+		/// <remarks>Creates a constraint for a single view with a specified attribute, relation, multiplier, and constant value.</remarks>
 		public static NSLayoutConstraint Create (NSObject view1, NSLayoutAttribute attribute1, NSLayoutRelation relation, nfloat multiplier, nfloat constant)
 		{
 			return NSLayoutConstraint.Create (view1, attribute1, relation, null, NSLayoutAttribute.NoAttribute, multiplier, constant);
 		}
 
-		/// <param name="view1">To be added.</param>
-		///         <param name="attribute1">To be added.</param>
-		///         <param name="relation">To be added.</param>
-		///         <summary>Static factory method to create a constraint based on a <see cref="View" />, an <see cref="NSLayoutAttribute" />, and an <see cref="NSLayoutRelation" />.</summary>
-		///         <returns>To be added.</returns>
-		///         <remarks>To be added.</remarks>
+		/// <summary>Factory method to create a constraint based on a <see cref="View" />, an <see cref="NSLayoutAttribute" />, and an <see cref="NSLayoutRelation" />.</summary>
+		/// <param name="view1">The view or object in the constraint.</param>
+		/// <param name="attribute1">The attribute for the view.</param>
+		/// <param name="relation">The relationship in the constraint.</param>
+		/// <returns>A new constraint with the specified parameters and default multiplier (1.0) and constant (0.0).</returns>
+		/// <remarks>Creates a constraint for a single view with default multiplier and constant values.</remarks>
 		public static NSLayoutConstraint Create (NSObject view1, NSLayoutAttribute attribute1, NSLayoutRelation relation)
 		{
 			return NSLayoutConstraint.Create (view1, attribute1, relation, null, NSLayoutAttribute.NoAttribute, 1.0f, 0f);
 		}
 
-		// This solves the duplicate selector export problem while not breaking the API.
-		/// <include file="../../docs/api/UIKit/NSLayoutConstraint.xml" path="/Documentation/Docs[@DocId='M:UIKit.NSLayoutConstraint.Create(Foundation.NSObject,UIKit.NSLayoutAttribute,UIKit.NSLayoutRelation,Foundation.NSObject,UIKit.NSLayoutAttribute,System.Runtime.InteropServices.NFloat,System.Runtime.InteropServices.NFloat)']/*" />
+		/// <summary>Factory method for creating a constraint.</summary>
+		/// <param name="view1">First view in the constraint.</param>
+		/// <param name="attribute1">Attribute for the first view.</param>
+		/// <param name="relation">Relationship between the <paramref name="view1" /> and the <paramref name="view2" />.</param>
+		/// <param name="view2">Second view in the constraint. This parameter can be <see langword="null" />.</param>
+		/// <param name="attribute2">Attribute for the second view.</param>
+		/// <param name="multiplier">Multiplier applied to the second attribute.</param>
+		/// <param name="constant">Constant to add.</param>
+		/// <returns>A new constraint with the specified parameters.</returns>
+		/// <remarks>Creates a constraint relationship between the <paramref name="view1" /> and the <paramref name="view2" /> that satisfies the following linear equation: <paramref name="attribute1" /> = <paramref name="multiplier" /> x <paramref name="attribute2" /> + <paramref name="constant" />.</remarks>
 		public static NSLayoutConstraint Create (NSObject view1, NSLayoutAttribute attribute1, NSLayoutRelation relation,
-					NSObject view2, NSLayoutAttribute attribute2, nfloat multiplier, nfloat constant)
+					NSObject? view2, NSLayoutAttribute attribute2, nfloat multiplier, nfloat constant)
 		{
 			return Create ((INativeObject) view1, attribute1, relation, view2, attribute2, multiplier, constant);
 		}
 
-		/// <typeparam name="AnchorType">To be added.</typeparam>
-		///         <summary>For an anchor-based constraint, returns the first anchor, properly downcast to <c>AnchorType</c>.</summary>
-		///         <returns>To be added.</returns>
-		///         <remarks>To be added.</remarks>
-		[SupportedOSPlatform ("ios")]
-		[SupportedOSPlatform ("maccatalyst")]
-		[SupportedOSPlatform ("tvos")]
-		[SupportedOSPlatform ("macos")]
-		public NSLayoutAnchor<AnchorType> FirstAnchor<AnchorType> () where AnchorType : NSObject
+		/// <summary>For an anchor-based constraint, returns the first anchor, properly downcast to <typeparamref name="AnchorType" />.</summary>
+		/// <typeparam name="AnchorType">The type of anchor to return.</typeparam>
+		/// <returns>The first anchor of the constraint, cast to the specified anchor type.</returns>
+		/// <remarks>This method is useful for retrieving the first anchor when working with anchor-based constraints.</remarks>
+		public NSLayoutAnchor<AnchorType>? FirstAnchor<AnchorType> () where AnchorType : NSObject
 		{
 			return Runtime.GetNSObject<NSLayoutAnchor<AnchorType>> (_FirstAnchor ());
 		}
 
-		/// <typeparam name="AnchorType">To be added.</typeparam>
-		///         <summary>For an anchor-based constraint, returns the second anchor, properly downcast to <c>AnchorType</c>.</summary>
-		///         <returns>To be added.</returns>
-		///         <remarks>To be added.</remarks>
-		[SupportedOSPlatform ("ios")]
-		[SupportedOSPlatform ("maccatalyst")]
-		[SupportedOSPlatform ("tvos")]
-		[SupportedOSPlatform ("macos")]
-		public NSLayoutAnchor<AnchorType> SecondAnchor<AnchorType> () where AnchorType : NSObject
+		/// <summary>For an anchor-based constraint, returns the second anchor, properly downcast to <typeparamref name="AnchorType" />.</summary>
+		/// <typeparam name="AnchorType">The type of anchor to return.</typeparam>
+		/// <returns>The second anchor of the constraint, cast to the specified anchor type.</returns>
+		/// <remarks>This method is useful for retrieving the second anchor when working with anchor-based constraints.</remarks>
+		public NSLayoutAnchor<AnchorType>? SecondAnchor<AnchorType> () where AnchorType : NSObject
 		{
 			return Runtime.GetNSObject<NSLayoutAnchor<AnchorType>> (_SecondAnchor ());
 		}