I have read that you can change a ipa to a zip file to explore it and the app is in the payload folder. However I was wondering is it possible to actually look at the code that was written for the app? I just started reading on objective-c and was curious about this. Would be cool to see what some of these apps look like.
No you can no view the code that the app made from although you can view the app contents and look at images, sounds, plists, ect. by right clicking on the app's icon and clicking "Show Package Contents" then you can navigate to the resources folder. If you wan't to view and ipw you can make it a zip and then you will find 3 encrypted dmgs in it, to decrypt them you can use iDecrypt and to finded the codes just go here "http://tinyurl.com/25gpbwe" and fallow the table to find your firmwere and the root file system VFDecrypt key.