Fix accessibleElements warning in _ASDisplayView (#2100)

AsyncDisplayKit/Details/_ASDisplayView.h

@@ -16,8 +16,6 @@
 
 @interface _ASDisplayView : UIView
 
-@property (copy, nonatomic) NSArray *accessibleElements;
-
 // These methods expose a way for ASDisplayNode touch events to let the view call super touch events
 // Some UIKit mechanisms, like UITableView and UICollectionView selection handling, require this to work
 - (void)__forwardTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;

AsyncDisplayKit/Details/_ASDisplayView.mm

@@ -9,6 +9,7 @@
 //
 
 #import "_ASDisplayView.h"
+#import "_ASDisplayViewAccessiblity.h"
 
 #import "_ASCoreAnimationExtras.h"
 #import "ASDisplayNodeInternal.h"
@@ -34,7 +35,6 @@
   CGRect _lastAccessibleElementsFrame;
 }
 
-@synthesize accessibleElements = _accessibleElements;
 @synthesize asyncdisplaykit_node = _node;
 
 + (Class)layerClass
@@ -165,7 +165,7 @@
   [super addSubview:view];
   
 #ifndef ASDK_ACCESSIBILITY_DISABLE
-  [self setAccessibleElements:nil];
+  self.accessibleElements = nil;
 #endif
 }
 
@@ -174,7 +174,7 @@
   [super willRemoveSubview:subview];
   
 #ifndef ASDK_ACCESSIBILITY_DISABLE
-  [self setAccessibleElements:nil];
+  self.accessibleElements = nil;
 #endif
 }
 

AsyncDisplayKit/Details/_ASDisplayViewAccessiblity.h

@@ -9,3 +9,7 @@
 //
 
 #import <Foundation/Foundation.h>
+
+@interface _ASDisplayView (UIAccessibilityContainer)
+@property (copy, nonatomic) NSArray *accessibleElements;
+@end