diff --git a/csharp/Facebook.Yoga/ios/Facebook.Yoga.iOS.sln b/csharp/Facebook.Yoga/ios/Facebook.Yoga.iOS.sln
index 7985b2f1..f741ff63 100644
--- a/csharp/Facebook.Yoga/ios/Facebook.Yoga.iOS.sln
+++ b/csharp/Facebook.Yoga/ios/Facebook.Yoga.iOS.sln
@@ -5,6 +5,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Facebook.Yoga.iOS", "Facebo
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Facebook.Yoga.iOS.Test", "Facebook.Yoga.iOS.Test\Facebook.Yoga.iOS.Test.csproj", "{3B27656A-129D-4779-BDAD-1A088DFDD9C5}"
EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Facebook.YogaKit.iOS", "Facebook.YogaKit.iOS\Facebook.YogaKit.iOS.csproj", "{33B1B6BE-F415-4819-A5FB-CFFE2E40AD6E}"
+EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
@@ -39,5 +41,17 @@ Global
{3B27656A-129D-4779-BDAD-1A088DFDD9C5}.Release|iPhoneSimulator.Build.0 = Release|iPhoneSimulator
{3B27656A-129D-4779-BDAD-1A088DFDD9C5}.Debug|iPhone.ActiveCfg = Debug|iPhone
{3B27656A-129D-4779-BDAD-1A088DFDD9C5}.Debug|iPhone.Build.0 = Debug|iPhone
+ {33B1B6BE-F415-4819-A5FB-CFFE2E40AD6E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+ {33B1B6BE-F415-4819-A5FB-CFFE2E40AD6E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+ {33B1B6BE-F415-4819-A5FB-CFFE2E40AD6E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+ {33B1B6BE-F415-4819-A5FB-CFFE2E40AD6E}.Release|Any CPU.Build.0 = Release|Any CPU
+ {33B1B6BE-F415-4819-A5FB-CFFE2E40AD6E}.Debug|iPhoneSimulator.ActiveCfg = Debug|Any CPU
+ {33B1B6BE-F415-4819-A5FB-CFFE2E40AD6E}.Debug|iPhoneSimulator.Build.0 = Debug|Any CPU
+ {33B1B6BE-F415-4819-A5FB-CFFE2E40AD6E}.Release|iPhone.ActiveCfg = Release|Any CPU
+ {33B1B6BE-F415-4819-A5FB-CFFE2E40AD6E}.Release|iPhone.Build.0 = Release|Any CPU
+ {33B1B6BE-F415-4819-A5FB-CFFE2E40AD6E}.Release|iPhoneSimulator.ActiveCfg = Release|Any CPU
+ {33B1B6BE-F415-4819-A5FB-CFFE2E40AD6E}.Release|iPhoneSimulator.Build.0 = Release|Any CPU
+ {33B1B6BE-F415-4819-A5FB-CFFE2E40AD6E}.Debug|iPhone.ActiveCfg = Debug|Any CPU
+ {33B1B6BE-F415-4819-A5FB-CFFE2E40AD6E}.Debug|iPhone.Build.0 = Debug|Any CPU
EndGlobalSection
EndGlobal
diff --git a/csharp/Facebook.Yoga/ios/Facebook.YogaKit.iOS/Facebook.YogaKit.iOS.csproj b/csharp/Facebook.Yoga/ios/Facebook.YogaKit.iOS/Facebook.YogaKit.iOS.csproj
new file mode 100644
index 00000000..1781b830
--- /dev/null
+++ b/csharp/Facebook.Yoga/ios/Facebook.YogaKit.iOS/Facebook.YogaKit.iOS.csproj
@@ -0,0 +1,67 @@
+
+
+
+ Debug
+ AnyCPU
+ {33B1B6BE-F415-4819-A5FB-CFFE2E40AD6E}
+ {FEACFBD2-3405-455C-9665-78FE426C6842};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}
+ Library
+ Facebook.YogaKit.iOS
+ Facebook.YogaKit.iOS
+ Resources
+
+
+ true
+ full
+ false
+ bin\Debug
+ DEBUG;
+ prompt
+ 4
+ iPhone Developer
+ true
+ true
+ true
+ true
+ true
+ 51303
+ false
+
+
+
+
+
+ pdbonly
+ true
+ bin\Release
+
+ prompt
+ 4
+ iPhone Developer
+ true
+ true
+ SdkOnly
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ {BE4CBFDA-02E2-4DF0-A81A-CEFB7987A708}
+ Facebook.Yoga.iOS
+
+
+
+
\ No newline at end of file
diff --git a/csharp/Facebook.Yoga/ios/Facebook.YogaKit.iOS/Properties/AssemblyInfo.cs b/csharp/Facebook.Yoga/ios/Facebook.YogaKit.iOS/Properties/AssemblyInfo.cs
new file mode 100644
index 00000000..944ab239
--- /dev/null
+++ b/csharp/Facebook.Yoga/ios/Facebook.YogaKit.iOS/Properties/AssemblyInfo.cs
@@ -0,0 +1,26 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+
+// Information about this assembly is defined by the following attributes.
+// Change them to the values specific to your project.
+
+[assembly: AssemblyTitle("Facebook.YogaKit.iOS")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("")]
+[assembly: AssemblyCopyright("rmarinho")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// The assembly version has the format "{Major}.{Minor}.{Build}.{Revision}".
+// The form "{Major}.{Minor}.*" will automatically update the build and revision,
+// and "{Major}.{Minor}.{Build}.*" will update just the revision.
+
+[assembly: AssemblyVersion("1.0.*")]
+
+// The following attributes are used to specify the signing key for the assembly,
+// if desired. See the Mono documentation for more information about signing.
+
+//[assembly: AssemblyDelaySign(false)]
+//[assembly: AssemblyKeyFile("")]
diff --git a/csharp/Facebook.Yoga/ios/Facebook.YogaKit.iOS/YogaKit.cs b/csharp/Facebook.Yoga/ios/Facebook.YogaKit.iOS/YogaKit.cs
new file mode 100644
index 00000000..a79f2b29
--- /dev/null
+++ b/csharp/Facebook.Yoga/ios/Facebook.YogaKit.iOS/YogaKit.cs
@@ -0,0 +1,262 @@
+using System;
+using System.Collections.Generic;
+using System.Runtime.InteropServices;
+using CoreGraphics;
+using Facebook.Yoga;
+using Foundation;
+using UIKit;
+
+namespace Facebook.YogaKit.iOS
+{
+ class YGNodeBridge : NSObject
+ {
+ internal WeakReference viewRef;
+ internal YogaNode node;
+ public YGNodeBridge()
+ {
+ node = new YogaNode();
+ }
+
+ public void SetContext(UIView view)
+ {
+ viewRef = new WeakReference(view);
+ YogaKit.Bridges.Add(node, this);
+ }
+ }
+
+ public static class YogaKit
+ {
+
+ internal static Dictionary Bridges = new Dictionary();
+
+ static NSString YogaNodeKey = new NSString(nameof(GetYogaNode));
+
+ static NSString UsesYogaKey = new NSString(nameof(UsesYoga));
+
+ static NSString IncludeYogaKey = new NSString(nameof(UsesYoga));
+
+ public static void UsesYoga(this UIView view, bool usesYoga)
+ {
+ var value = NSNumber.FromBoolean(usesYoga);
+ objc_setAssociatedObject(view.Handle, UsesYogaKey.Handle, value.Handle, AssociationPolicy.RETAIN_NONATOMIC);
+ }
+
+ public static bool GetUsesYoga(this UIView view)
+ {
+ var value = ObjCRuntime.Runtime.GetNSObject(objc_getAssociatedObject(view.Handle, UsesYogaKey.Handle)) as NSNumber;
+ return value == null ? false : value.BoolValue;
+ }
+
+ public static void IncludeYogaLayout(this UIView view, bool includeInLayout)
+ {
+ var value = NSNumber.FromBoolean(includeInLayout);
+ objc_setAssociatedObject(view.Handle, IncludeYogaKey.Handle, value.Handle, AssociationPolicy.RETAIN_NONATOMIC);
+ }
+
+ public static bool GetIncludeYogaLayout(this UIView view)
+ {
+ var value = ObjCRuntime.Runtime.GetNSObject(objc_getAssociatedObject(view.Handle, IncludeYogaKey.Handle)) as NSNumber;
+ return value == null ? true : value.BoolValue;
+ }
+
+ public static void YogaWidth(this UIView view, nfloat width)
+ {
+ var node = GetYogaNode(view);
+ node.Width = (float)width;
+ }
+
+ public static void YogaHeight(this UIView view, nfloat height)
+ {
+ var node = GetYogaNode(view);
+ node.Height = (float)height;
+ }
+
+ public static void YogaAlignItems(this UIView view, Yoga.YogaAlign align)
+ {
+ var node = GetYogaNode(view);
+ node.AlignItems = align;
+ }
+
+ public static void YogaJustify(this UIView view, Yoga.YogaJustify justify)
+ {
+ var node = GetYogaNode(view);
+ node.JustifyContent = justify;
+ }
+
+ public static void YogaApplyLayout(this UIView view)
+ {
+ CalculateLayoutWithSize(view, view.Bounds.Size);
+ ApplyLayoutToViewHierarchy(view);
+ }
+
+ static CGSize CalculateLayoutWithSize(UIView view, CGSize size)
+ {
+ if (!view.GetUsesYoga())
+ {
+ System.Diagnostics.Debug.WriteLine("Doesn't use Yoga");
+ }
+ AttachNodesFromViewHierachy(view);
+ var node = GetYogaNode(view);
+
+ node.Width = (float)size.Width;
+ node.Height = (float)size.Height;
+ node.CalculateLayout();
+
+ return new CGSize { Width = node.LayoutWidth, Height = node.LayoutHeight };
+ }
+
+ static long MeasureView(YogaNode node, float width, YogaMeasureMode widthMode, float height, YogaMeasureMode heightMode)
+ {
+ var constrainedWidth = (widthMode == YogaMeasureMode.Undefined) ? nfloat.MaxValue : width;
+ var constrainedHeight = (heightMode == YogaMeasureMode.Undefined) ? nfloat.MaxValue : height;
+
+ UIView view = null;
+ if (Bridges.ContainsKey(node))
+ Bridges[node].viewRef.TryGetTarget(out view);
+
+ var sizeThatFits = view.SizeThatFits(new CGSize(constrainedWidth, constrainedHeight));
+
+ var finalWidth = SanitizeMeasurement(constrainedWidth, sizeThatFits.Width, widthMode);
+ var finalHeight = SanitizeMeasurement(constrainedHeight, sizeThatFits.Height, heightMode);
+
+ return MeasureOutput.Make(finalWidth, finalHeight);
+ }
+
+ static float SanitizeMeasurement(nfloat constrainedSize, nfloat measuredSize, YogaMeasureMode measureMode)
+ {
+ float result;
+ if (measureMode == YogaMeasureMode.Exactly)
+ {
+ result = (float)constrainedSize;
+ }
+ else if (measureMode == YogaMeasureMode.AtMost)
+ {
+ result = (float)Math.Min(constrainedSize, measuredSize);
+ }
+ else {
+ result = (float)measuredSize;
+ }
+
+ return result;
+
+ }
+
+ static void ApplyLayoutToViewHierarchy(UIView view)
+ {
+ if (!view.GetIncludeYogaLayout())
+ return;
+
+ var node = GetYogaNode(view);
+ CGPoint topLeft = new CGPoint(node.LayoutX, node.LayoutY);
+ CGPoint bottomRight = new CGPoint(topLeft.X + node.LayoutWidth, topLeft.Y + node.LayoutHeight);
+ view.Frame = new CGRect(RoundPixelValue(topLeft.X), RoundPixelValue(topLeft.Y), RoundPixelValue(bottomRight.X) - RoundPixelValue(topLeft.X), RoundPixelValue(bottomRight.Y) - RoundPixelValue(topLeft.Y));
+ bool isLeaf = !view.GetUsesYoga() || view.Subviews.Length == 0;
+ if (!isLeaf)
+ {
+ for (int i = 0; i < view.Subviews.Length; i++)
+ {
+ ApplyLayoutToViewHierarchy(view.Subviews[i]);
+ }
+ }
+ }
+
+ static double RoundPixelValue(nfloat value)
+ {
+ nfloat scale = UIScreen.MainScreen.Scale;
+
+ return Math.Round(value * scale) / scale;
+ }
+
+ static void AttachNodesFromViewHierachy(UIView view)
+ {
+ var node = GetYogaNode(view);
+
+ // Only leaf nodes should have a measure function
+ if (!view.GetUsesYoga() || view.Subviews.Length == 0)
+ {
+ node.SetMeasureFunction(MeasureView);
+ RemoveAllChildren(node);
+ }
+ else
+ {
+ node.SetMeasureFunction(null);
+ // Create a list of all the subviews that we are going to use for layout.
+ var subviewsToInclude = new List();
+ foreach (var subview in view.Subviews)
+ {
+ if (subview.GetIncludeYogaLayout())
+ {
+ subviewsToInclude.Add(subview);
+ }
+ }
+
+ var shouldReconstructChildList = false;
+ if (node.Count != subviewsToInclude.Count)
+ {
+ shouldReconstructChildList = true;
+ }
+ else
+ {
+ for (int i = 0; i < subviewsToInclude.Count; i++)
+ {
+ if (node[i] != GetYogaNode(subviewsToInclude[i]))
+ {
+ shouldReconstructChildList = true;
+ break;
+ }
+ }
+ }
+
+ if (shouldReconstructChildList)
+ {
+ RemoveAllChildren(node);
+
+ for (int i = 0; i < subviewsToInclude.Count; i++)
+ {
+ var subView = subviewsToInclude[i];
+ node.Insert(i, subView.GetYogaNode());
+ AttachNodesFromViewHierachy(subView);
+ }
+ }
+ }
+ }
+
+ static void RemoveAllChildren(YogaNode node)
+ {
+ if (node == null)
+ return;
+
+ while (node.Count > 0)
+ {
+ node.Clear();
+ }
+ }
+
+ static YogaNode GetYogaNode(this UIView view)
+ {
+ var value = ObjCRuntime.Runtime.GetNSObject(objc_getAssociatedObject(view.Handle, YogaNodeKey.Handle)) as YGNodeBridge;
+ if (value == null)
+ {
+ value = new YGNodeBridge();
+ value.SetContext(view);
+ objc_setAssociatedObject(view.Handle, YogaNodeKey.Handle, value.Handle, AssociationPolicy.RETAIN_NONATOMIC);
+ }
+ return value.node;
+ }
+
+ [DllImport("/usr/lib/libobjc.dylib")]
+ static extern void objc_setAssociatedObject(IntPtr @object, IntPtr key, IntPtr value, AssociationPolicy policy);
+
+ [DllImport("/usr/lib/libobjc.dylib")]
+ static extern IntPtr objc_getAssociatedObject(IntPtr @object, IntPtr key);
+
+ enum AssociationPolicy
+ {
+ ASSIGN = 0,
+ RETAIN_NONATOMIC = 1,
+ COPY_NONATOMIC = 3,
+ RETAIN = 01401,
+ COPY = 01403,
+ }
+ }
+}