Is it possible to share images, text or whatever you want through Whatsapp in a iOS app? I'm searching on google but I only found results talking about Android implementations.
Thanks in advance!
No this is not possible, whatsapp does not have any public API you can use.
Please note that this answer is correct for 2011 when there was no API for WhatsApp.
Now there is an api available for interacting with WhatsApp: http://www.whatsapp.com/faq/en/iphone/23559013