When you approach a pig and hold wheat, it won't follow you. Also, if you right click on it with wheat, it won't eat it. (Note, sometimes it will look at you.)
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Yes, carrots do make pigs follow you, but wheat is supposed to do it to.
(Source: Minecraft Essentials Handbook)
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!
Publisher: Scholastic Inc. (November 26, 2013)
Mojang can't just ignore the game and not update it for nearly a year. Expect changes from non-digital content. You may wish to review the Minecraft Wiki while not a validation source it has a lot of good info.
As you obviously can't trust that handbook, use the Minecraftwiki instead for info about how Minecraft works,
http://minecraft.gamepedia.com/Minecraft_Wiki
your not SUPPOSED to use wheat for the pigs, its carrots that makes them follow you! (gets a mod to say the resolution is "works as intendened")