Hi,
just create a index.php in the xyz directory and set the following code:
<?php
$ipad = (bool) strpos($_SERVER['HTTP_USER_AGENT'], 'iPad');
$iphone = (bool) strpos($_SERVER['HTTP_USER_AGENT'], 'iPhone');
if ($iphone or $ipad ) {
header('location: my.unique.scheme://HereYouCanAddAnyTextYouLike');
}else{
echo("No iPhone or iPad");
}
?>