ASButtonNode sets its subnodes as layer backed, but itelf should not be layer backed

Author: Rajinder Ramgarhia

AsyncDisplayKit/ASButtonNode.h

@@ -47,15 +47,15 @@
 - (NSAttributedString * _Nullable)attributedTitleForState:(ASControlState)state;
 
 /**
- *  Sets the styled title to use for the specified state.
+ *  Sets the styled title to use for the specified state. This will reset styled title previously set with -setTitle:withFont:withColor:forState.
  *
  *  @param title The styled text string to use for the title.
  *  @param state The state that uses the specified title. The possible values are described in ASControlState.
  */
 - (void)setAttributedTitle:(nullable NSAttributedString *)title forState:(ASControlState)state;
 
 /**
- *  Sets the title to use for the specified state.
+ *  Sets the title to use for the specified state. This will reset styled title previously set with -setAttributedTitle:forState.
  *
  *  @param title The styled text string to use for the title.
  *  @param font The font to use for the title.

AsyncDisplayKit/ASButtonNode.mm

@@ -48,7 +48,12 @@ - (instancetype)init
     _titleNode = [[ASTextNode alloc] init];
     _imageNode = [[ASImageNode alloc] init];
     _backgroundImageNode = [[ASImageNode alloc] init];
+    [_backgroundImageNode setContentMode:UIViewContentModeScaleToFill];
 
+    [_titleNode setLayerBacked:YES];
+    [_imageNode setLayerBacked:YES];
+    [_backgroundImageNode setLayerBacked:YES];
+      
     _contentHorizontalAlignment = ASAlignmentMiddle;
     _contentVerticalAlignment = ASAlignmentCenter;
 
@@ -59,6 +64,12 @@ - (instancetype)init
   return self;
 }
 
+- (void)setLayerBacked:(BOOL)layerBacked
+{
+  ASDisplayNodeAssert(!layerBacked, @"ASButtonNode must not be layer backed!");
+  [super setLayerBacked:layerBacked];
+}
+
 - (void)setEnabled:(BOOL)enabled
 {
   [super setEnabled:enabled];