Headphones plugin/out detection in Swift

Question

im working on an iphone app for iOS 8.1 that works with core audio to generate frequencies and adjust intensities. In the view controller that i generate the frequencies i n

Answer 1

In Swift 4

    func activateHeadPhonesStatus(){
     NotificationCenter.default.addObserver(self, selector: #selector(audioRouteChangeListener(_:)), name: AVAudioSession.routeChangeNotification, object: nil)
    }

    @objc func audioRouteChangeListener(_ notification:Notification) {
            guard let userInfo = notification.userInfo,
                let reasonValue = userInfo[AVAudioSessionRouteChangeReasonKey] as? UInt,
                let reason = AVAudioSession.RouteChangeReason(rawValue:reasonValue) else {
                    return
            }
            switch reason {
            case .newDeviceAvailable:
                let session = AVAudioSession.sharedInstance()
                for output in session.currentRoute.outputs where output.portType == AVAudioSession.Port.headphones {
                    headphonesConnected = true
                    print("headphone plugged in")
                    break
                }
            case .oldDeviceUnavailable:
                if let previousRoute =
                    userInfo[AVAudioSessionRouteChangePreviousRouteKey] as? AVAudioSessionRouteDescription {
                    for output in previousRoute.outputs where output.portType == AVAudioSession.Port.headphones {
                        headphonesConnected = false
                        print("headphone pulled out")
                        break
                    }
                }
            default: ()
            }

        }