currentTrack.swift

#! /usr/bin/swift

import ScriptingBridge

@objc protocol iTunesTrack {
    optional var name: String! {get}
    optional var album: String! {get}
    optional var foo: 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 '!' the result out.
let track = app.currentTrack!
let album = track.album!
let trackName = track.name!


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