Swift setup AVAudioSession

Audio Session

func setSessionPlayer() {
        let session:AVAudioSession = AVAudioSession.sharedInstance()
        var error: NSError?
        if !session.setCategory(AVAudioSessionCategoryPlayback, error:&error) {
            println("could not set session category")
            if let e = error {
                println(e.localizedDescription)
            }
        }
        if !session.setActive(true, error: &error) {
            println("could not make session active")
            if let e = error {
                println(e.localizedDescription)
            }
        }
    }