Make TextInput "clear text" button accessible

Author: haitaoli

Libraries/Text/RCTUITextField.m

@@ -87,6 +87,22 @@ - (void)setEditable:(BOOL)editable
   self.enabled = editable;
 }
 
+#pragma mark - Accessibility
+
+- (BOOL)isAccessibilityElement
+{
+  // Always return NO to enumerate child elements. Otherwise the "clear text" button is hidden
+  // from accessibility interface.
+  return NO;
+}
+
+- (BOOL)accessibilityElementsHidden
+{
+  // If "accessible" prop is set to false on TextInput, disable all accessible children.
+  // Without this function the "clear text" UIButton is still exposed.
+  return ![super isAccessibilityElement];
+}
+
 #pragma mark - Caret Manipulation
 
 - (CGRect)caretRectForPosition:(UITextPosition *)position