How do you modify an IOS swift 3 app to use Inter-App Audio (IAA)

I am writing a swift 3 audio app that uses AVFoundation, AVPlayer and AVAudioSession. I've accessed the Apple documentation for Inter-App Audio (IAA) but all the coding is in objective-C. I'd like something similar for Swift 3 as some aspects seem too difficult to convert to swift3. Perhaps somebody has already achieved this in swift3. Thanks.