From 58328d01efa7ad30f89761f510ae4131796d7f4a Mon Sep 17 00:00:00 2001
From: Bin Yu <binyu@fb.com>
Date: Thu, 21 Sep 2017 09:58:08 -0700
Subject: [PATCH] Add 'useYoga' property to indicate whether UIView uses Yoga
 for layout or not

Summary: Now developer could check whether UIView uses Yoga for layout.

Reviewed By: emilsjolander

Differential Revision: D5881242

fbshipit-source-id: 4d1cf0b489b759ff0b9c5091cc51534fd12dcf60
---
 YogaKit/Source/UIView+Yoga.h | 4 ++++
 YogaKit/Source/UIView+Yoga.m | 5 +++++
 2 files changed, 9 insertions(+)

diff --git a/YogaKit/Source/UIView+Yoga.h b/YogaKit/Source/UIView+Yoga.h
index 0dce4993..49f97cd0 100644
--- a/YogaKit/Source/UIView+Yoga.h
+++ b/YogaKit/Source/UIView+Yoga.h
@@ -20,6 +20,10 @@ typedef void (^YGLayoutConfigurationBlock)(YGLayout *);
  The YGLayout that is attached to this view. It is lazily created.
  */
 @property (nonatomic, readonly, strong) YGLayout *yoga;
+/**
+ Indicates whether or not Yoga is enabled
+ */
+@property (nonatomic, readonly, assign) BOOL isYogaEnabled;
 
 /**
  In ObjC land, every time you access `view.yoga.*` you are adding another `objc_msgSend`
diff --git a/YogaKit/Source/UIView+Yoga.m b/YogaKit/Source/UIView+Yoga.m
index 4448b377..6b8d921b 100644
--- a/YogaKit/Source/UIView+Yoga.m
+++ b/YogaKit/Source/UIView+Yoga.m
@@ -26,6 +26,11 @@ static const void *kYGYogaAssociatedKey = &kYGYogaAssociatedKey;
   return yoga;
 }
 
+- (BOOL)isYogaEnabled
+{
+  return objc_getAssociatedObject(self, kYGYogaAssociatedKey) != nil;
+}
+
 - (void)configureLayoutWithBlock:(YGLayoutConfigurationBlock)block
 {
   if (block != nil) {