From 3f42fcbc7dab558a418956a750fef7d3dc135923 Mon Sep 17 00:00:00 2001
From: Hannah Troisi <htroisi@pinterest.com>
Date: Thu, 29 Sep 2016 21:22:23 -0700
Subject: [PATCH] check button state before changing` (#2323)

---
 AsyncDisplayKit/ASButtonNode.mm | 26 ++++++++++++++++----------
 1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/AsyncDisplayKit/ASButtonNode.mm b/AsyncDisplayKit/ASButtonNode.mm
index a0eb08de..0bcad75c 100644
--- a/AsyncDisplayKit/ASButtonNode.mm
+++ b/AsyncDisplayKit/ASButtonNode.mm
@@ -110,25 +110,31 @@
 
 - (void)setEnabled:(BOOL)enabled
 {
-  [super setEnabled:enabled];
-  if (enabled) {
-    self.accessibilityTraits = UIAccessibilityTraitButton;
-  } else {
-    self.accessibilityTraits = UIAccessibilityTraitButton | UIAccessibilityTraitNotEnabled;
+  if (self.enabled != enabled) {
+    [super setEnabled:enabled];
+    if (enabled) {
+      self.accessibilityTraits = UIAccessibilityTraitButton;
+    } else {
+      self.accessibilityTraits = UIAccessibilityTraitButton | UIAccessibilityTraitNotEnabled;
+    }
+    [self updateButtonContent];
   }
-  [self updateButtonContent];
 }
 
 - (void)setHighlighted:(BOOL)highlighted
 {
-  [super setHighlighted:highlighted];
-  [self updateButtonContent];
+  if (self.highlighted != highlighted) {
+    [super setHighlighted:highlighted];
+    [self updateButtonContent];
+  }
 }
 
 - (void)setSelected:(BOOL)selected
 {
-  [super setSelected:selected];
-  [self updateButtonContent];
+  if (self.selected != selected) {
+    [super setSelected:selected];
+    [self updateButtonContent];
+  }
 }
 
 - (void)updateButtonContent