Just so you know Mojang, next time you make a book like that, you need to make it as up to date as possible. Thanks!
O.K, forget about this, you CAN'T use wheat to attract pigs. Sorry!
Yes, carrots do make pigs follow you, but wheat is supposed to do it to.(Source: Minecraft Essentials Handbook)
Jesus Man
Just so you know Mojang, next time you make a book like that, you need to make it as up to date as possible. Thanks!