Ok so how can we mod a mobspawner in minecraft that makes mobs not pigs i cant seem to code it in pls someone help me
I believe that you need to place them on mossy cobblestone and have a higher setting then peaceful. Not %100 sure but I think that is how you spawn the actual mobs
http://www.minecraftwiki.net/wiki/Mob_Spawner gives you all the info you need straight from the source
You can't do that. The default for spawners is pigs and there is no way that I myself am aware of. There could be a way, but not to my knowledge.