If you want to consume Objective-C code from Swift, you'll need to use a bridging header.
If you didn't create one when you first created the project:
This can be done by File -> New -> File ... -> iOS -> Source -> Header
File. You'll want to name this file something like
YourProject-Bridging-Header.h, but the name doesn't actually affect
the build process. You'll need to specify this file as a bridging
header in your project's Build Settings.
You will then #import every Objective-C header you want to expose to
Swift in this file.
