递归找出当前View上处于可编辑状态的UIView

- (UIView*)findFirstResponderBeneathView:(UIView*)view {

    // Search recursively for first responder

   for ( UIView *childViewin view.subviews ) {

       if ( [childView respondsToSelector:@selector(isFirstResponder)] && [childViewisFirstResponder] )

        {

           return childView;

            

        }

        UIView *result = [selffindFirstResponderBeneathView:childView];

       if ( result )

           return result;

    }

    return nil;

}