Does your current app have any sort of external-facing API built into it? That might be step one would be to implement an API to your server that would allow yo

Does your current app have any sort of external-facing API built into it? That might be step one would be to implement an API to your server that would allow your iOS app to access the photos. Another option would be to design a mobile version of the site, and then to use http://phonegap.com/ http://phonegap.com/ to turn it into an iOS and Android app. This way you could continue serving the photos from your server in its current form, and the only real programming to be done would be creating mobile views for the site. Would probably help you avoid shelling out $$ to a freelancer as well.