After entering Signup details and pressing the Signup button, you can send a HTTP POST request to your PHP server with the signup details encrypted as HTTP parameters and then save those to the database.
And then when you move to the next view and want to get the signup details :-
1. If you do not want to save them on the ios app, use Keychain to store them locally. Check here for detailed implementation of how to store
2. If you want them to save to the server and then get them on another view using HTTP request, send a HTTP request and get the encrypted (for security) JSON and then parse it using SBJson framework.