title: What "source code files" are needed to turnover (continue develop of) an iOS application?
body: <p>I am working with a developer on an iOS app and upon completion, all source code, files, etc. should be turned over to me so that I can continue development in the future with another developer if necessary. I need help understanding exactly which files I should receive.</p>
  
  <p>Should I be ok with .ipa file? Or maybe .app file? Or the Xcode project file? What will ensure that I have all I need to continue development in the future?</p>