iOS external keyboard action, like RETURN button of the external keyboard, code sample below

ky_iOS_external_keyboard_action.m

- (NSArray *)keyCommands
{
  return @[[UIKeyCommand keyCommandWithInput:@"\r"
                               modifierFlags:0
                                      action:@selector(didPressExternalKeyboardReturnButton)]];
}
    
- (void)didPressExternalKeyboardReturnButton
{
  // do ur action here
}