gistfile1.txt

if (obj1.position.y < obj2.position.y)
{
    return NSOrderedAscending;
}
else if (obj1.position.y > obj2.position.y)
{
    return NSOrderedDescending;
}
else
{
    if (obj1.position.x < obj2.position.x)
    {
        return NSOrderedAscending;
    }
    else if (obj1.position.x > obj2.position.x)
    {
        retrun = NSOrderedDescending;
    }
    else
    {
        return NSorderedSame;
    }
}