Write your app in C++ in whatever PC program you like, then you can go get a Mac and Xcode and port it.
i actually i already have some code in folder form and as wondering how exactly to port it onto my friends mac and how to compress it
Just remember that you need to compress the package using a mac when you submit the binary. I've previously encountered problem submitting the binary when i compressed using a PC. Something about invalid compression format.
My game is being written through a cross platform library which started out as PC/PS3 from my previous company. An ex-coleague added simple OS X and iPhone support which i've added to since. Another friend is helping me out with my game in return for use of my Library. He spent the weekend using the lib to write a little game prototype on his PC (he doesn't own a mac or iphone/itouch yet) This morning I got it up and running on my phone in half an hour. It takes a lot of groundwork to get the cross platform stuff working cleanly without compromising the primary (iPhone) version but it's really worth it. The PC version of Ground Effect has the level editor built in and my level designers can switch between editing and testing on a keypress. They also don't need to own a mac.
