Ummm... ya might have to leave him alone, and let him come to you... Don't try to 'force' affection on him... Say for instance that yer sitting on the sofa and he comes to you... if he jumps up beside you, pet him... but don't pick him up and put him beside you... And when he starts to bite and claw, that's when you firmly push him away... right off the sofa if needs be... He may change his behaviour so that he gets more attention....

Then again, he might not... they you might have to resign yourself to having a 'bitey' cat... But still, let affaction be on his terms... You'll get less scratches that way...

Remember that to other cats, that gentle biting and little scratching IS affection... The problem is we monkeys don't have the protective fur that they do, so it hurts us much more than it does them...