Using ScriptingBridge from Swift.

currentTrack.swift

#! /usr/bin/swift

import ScriptingBridge

@objc protocol iTunesTrack {
    optional var name: String {get}
    optional var album: String {get}
}

@objc protocol iTunesApplication {
    optional var soundVolume: Int {get}
    optional var currentTrack: iTunesTrack? {get}
}

extension SBApplication : iTunesApplication {}

let app: iTunesApplication = SBApplication(bundleIdentifier: "com.apple.iTunes")

// Because these are all optional properties (to avoid providing an implementation), we have 
// to use '!' to indicate we know the implementation exists.
let track: iTunesTrack? = app.currentTrack!
let album = track?.album!
let trackName = track?.name!


println("Current track: \(trackName) - \(album)")

How can you check if iTunes is currently playing audio?

What would the iTunesApplication protocol look like if one wanted to call a function call on it?