Add main thread warnings and setter/getter assert

AsyncDisplayKit/ASEditableTextNode.mm

@@ -41,6 +41,7 @@
 {
   @private
   // Configuration.
+  UITextView *_textView;
   NSDictionary *_typingAttributes;
 
   // Core.
@@ -134,7 +135,7 @@
   [self.view addSubview:_placeholderTextKitComponents.textView];
 
   // Create and configure our text view.
-    _textKitComponents.textView = _textView;
+  _textKitComponents.textView = _textView;
   //_textKitComponents.textView = NO; // Unfortunately there's a bug here with iOS 7 DP5 that causes the text-view to only be one line high when scrollEnabled is NO. rdar://14729288
   _textKitComponents.textView.delegate = self;
   _textKitComponents.textView.editable = YES;
@@ -189,6 +190,21 @@
 #pragma mark - Configuration
 @synthesize delegate = _delegate;
 
+#pragma mark -
+@dynamic textView;
+
+- (UITextView *)textView{
+  ASDisplayNodeAssertMainThread();
+  return _textView;
+}
+
+- (void)setTextView:(UITextView *)textView
+{
+  ASDisplayNodeAssertMainThread();
+  _textView = textView;
+}
+
+
 #pragma mark -
 @dynamic typingAttributes;