make ASEditableTextField properly subclass responder methods

AsyncDisplayKit/ASEditableTextNode.h

@@ -57,10 +57,10 @@
 - (BOOL)isFirstResponder;
 
 //! @abstract Makes the receiver's text view the first responder.
-- (void)becomeFirstResponder;
+- (BOOL)becomeFirstResponder;
 
 //! @abstract Resigns the receiver's text view from first-responder status, if it has it.
-- (void)resignFirstResponder;
+- (BOOL)resignFirstResponder;
 
 #pragma mark - Geometry
 /**

AsyncDisplayKit/ASEditableTextNode.mm

@@ -352,16 +352,26 @@
   return [_textKitComponents.textView isFirstResponder];
 }
 
-- (void)becomeFirstResponder
+- (BOOL)canBecomeFirstResponder {
-{
+    ASDN::MutexLocker l(_textKitLock);
-  ASDN::MutexLocker l(_textKitLock);
+    return [_textKitComponents.textView canBecomeFirstResponder];
-  [_textKitComponents.textView becomeFirstResponder];
 }
 
-- (void)resignFirstResponder
+- (BOOL)becomeFirstResponder
 {
   ASDN::MutexLocker l(_textKitLock);
-  [_textKitComponents.textView resignFirstResponder];
+  return [_textKitComponents.textView becomeFirstResponder];
+}
+
+- (BOOL)canResignFirstResponder {
+    ASDN::MutexLocker l(_textKitLock);
+    return [_textKitComponents.textView canResignFirstResponder];
+}
+
+- (BOOL)resignFirstResponder
+{
+  ASDN::MutexLocker l(_textKitLock);
+  return [_textKitComponents.textView resignFirstResponder];
 }
 
 #pragma mark - UITextView Delegate