Based on the information you provided I am guessing that you need also to register the Bridging header under Build Settings > Swift Compiler > Code Generation
with the relative path to the header.
In case this does not solve the issue could you please provide a sample that reproduces the issue and we will take a look into it?
For your convenience we created a simple project that uses the iOS SDK with Swift. Note that in order to test it you need to connect the app to a backend project of type Friends app
by entering the API key for this project in the ViewController.swift
Let me know if you have questions.