import AVFoundation

    let currentRoute = AVAudioSession.sharedInstance().currentRoute

    for description in currentRoute.outputs {
        if description.portType == AVAudioSessionPortLineOut {

        }else if description.portType == AVAudioSessionPortHeadphones {

        }else if description.portType == AVAudioSessionPortBluetoothA2DP{

        }else if description.portType == AVAudioSessionPortBuiltInReceiver{

        }else if description.portType == AVAudioSessionPortBuiltInSpeaker{

        }else if description.portType == AVAudioSessionPortHDMI{

        }else if description.portType == AVAudioSessionPortAirPlay{

        }else if description.portType == AVAudioSessionPortBluetoothLE{

        }
    }

func IsHeadSetConnected() -> Bool{
        let route  = AVAudioSession.sharedInstance().currentRoute;
        for desc   in route.outputs
        {
            let portType = desc.portType;
            if (portType == AVAudioSessionPortHeadphones)
            {
                return true;
            }

        }

        return false;
    }

NotificationCenter.default.addObserver(self, selector: #selector(handleRouteChange(_:)), name: NSNotification.Name.AVAudioSessionRouteChange, object: nil)

func handleRouteChange(_ notification: Notification) {
    guard
    let userInfo = notification.userInfo,
    let reasonRaw = userInfo[AVAudioSessionRouteChangeReasonKey] as? NSNumber,
    let reason = AVAudioSessionRouteChangeReason(rawValue: reasonRaw.uintValue)
    else { fatalError("Strange... could not get routeChange") }
    switch reason {
    case .oldDeviceUnavailable:
        print("oldDeviceUnavailable")
    case .newDeviceAvailable:
        print("headset/line plugged in")
    case .routeConfigurationChange:
        print("headset pulled out")
    case .categoryChange:
        print("Just category change")
    default:
        print("not handling reason")
    }
}

func isHeadphonesConnected() -> Bool{
    let routes = AVAudioSession.sharedInstance().currentRoute
    return routes.outputs.contains(where: { (port) -> Bool in
        port.portType == AVAudioSessionPortHeadphones
    })
}

if let availableInputs = AVAudioSession.sharedInstance().availableInputs {
    for route in availableInputs {
        if ( route.portType == AVAudioSessionPortBuiltInMic ) {
            //Headphone available
            break;
        }
    }
}

NSString *deviceType = [UIDevice currentDevice].model;
if([deviceType isEqualToString:@"iPhone"]) {
//iPhone
}

if let availableInputs = AVAudioSession.sharedInstance().availableInputs {
        for route in availableInputs {
            if ( route.portType == AVAudioSessionPortBuiltInMic ) {
                //Headphone available
                break;
            }
        }
    }