NSExtension NSExtensionAttributes NSExtensionActivationRule SUBQUERY ( extensionItems, $extensionItem, SUBQUERY ( $extensionItem.attachments, $attachment, ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.image" || ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.plain-text" || ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.url" || ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.png" || ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.jpeg" || ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.jpeg-2000" || ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "com.compuserve.gif" ).@count == $extensionItem.attachments.@count ).@count == 1 NSExtensionMainStoryboard MainInterface NSExtensionPointIdentifier com.apple.share-services