How to detect if a bluetooth headset plugged or not IOS 8?

Question

In my project, I use AVAudioSession to detect any headphone is plugged or unplugged. But in this case, I can\'t detect when bluetooth device is plugged. Here is

Answer 1

I was able to detect whether a bluetooth headset (HFP) device was currently connected using the following:

NSArray *arrayInputs = [[AVAudioSession sharedInstance] availableInputs];
for (AVAudioSessionPortDescription *port in arrayInputs)
{
    if ([port.portType isEqualToString:AVAudioSessionPortBluetoothHFP])
    {
        bHas = YES;
        break;
    }
}

However, your AVAudioSession category must be set as AVAudioSessionCategoryPlayAndRecord in order for this to work. If it isn't, the port will not show up in the list even if the HFP device is connected.

Answer 2

You can detect currently active bluetooth output devices (instead of input devices)

Swift Code:

import AVFoundation
func bluetoothAudioConnected() -> Bool{
  let outputs = AVAudioSession.sharedInstance().currentRoute.outputs
  for output in outputs{
    if output.portType == AVAudioSessionPortBluetoothA2DP || output.portType == AVAudioSessionPortBluetoothHFP || output.portType == AVAudioSessionPortBluetoothLE{
      return true
    }
  }
  return false
}

Bluetooth devices are based on the following question: What's the difference among AVAudioSessionPortBluetoothHFP, A2DP and LE?

I hope it helps someone

Answer 3

You can detect it with routeChangeNotification:

    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
        }
        if reason == .newDeviceAvailable {
            let session = AVAudioSession.sharedInstance()
            for output in session.currentRoute.outputs where output.portType == AVAudioSession.Port.bluetoothA2DP {
                print("Bluetooth Headphone Connected")
                break
            }
        }
    }