title: swift 2.3 to swift 3.0
body: <p>I have a project that was started using swift 2 in xcode 7. I am now using swift 2.3 in xcode 8. When I try to migrate to pro 3 I get several errors no project. Both from the libraries and from my code. First I update my pods and then do an automatic conversion of the project. My doubts are:
  In case some library can give rise to error I can unlock it and convert?
  Do I have to prepare something before starting the conversation? In the articles I read about it, I did not say anything else about it.
  In case you continue using swift 2.3 will you have any future problems?</p>
  
  <p>The application is very large, what would be the best option?</p>