SystemVolumeDidChangeNotification stopped getting triggered on iOS 15

Question

I asked and found a solution with SystemVolumeDidChangeNotification never get triggered on iOS 14. The event would be triggered and can be observed in iOS 14 with the workaround I found.

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)

    UIApplication.shared.beginReceivingRemoteControlEvents() // <- THIS LINE

    NotificationCenter.default.addObserver(self, selector: #selector(volumeChange(_:)), name: Notification.Name(rawValue: "AVSystemController_SystemVolumeDidChangeNotification"), object: nil)
}

However, after upgrading the system to iOS 15 the event stopped getting triggered.

XY L · Answer 1 · 2021-09-24T02:20:12.620

NOTE: This method does not work in the simulator. It only works with a real device.

Inside the ViewController class,

    internal var volumeValueObservation: NSKeyValueObservation?

Inside the ViewController life-cycle method,

        do {
            let audioSession = AVAudioSession.sharedInstance()

            try audioSession.setActive(true) // <- Important
            
            volumeValueObservation = audioSession.observe(\.outputVolume) { av, _ in
                print(">>> DEBUG: [ViewController:handleVolumeChange]", av.outputVolume)
            }
        } catch {}

REFERENCE

Swift 4 Using KVO to listen to volume changes

System Volume Change Observer not working on iOS 15

This works fine in iOS 16.3, but won't be triggered if you try to go past the minimum / maximum values. — Frederic Adda, Jan 31 '23 at 11:20

SystemVolumeDidChangeNotification stopped getting triggered on iOS 15

1 Answers1