How to Get Audio Volume Level, and Volume Changed Notifications on iOS

System Volume Change Observer not working on iOS 15

What you're doing is unsupported, so it's not really surprising if it doesn't work on all systems. The correct documented approach is to use KVO on the audio session outputVolume property: https://developer.apple.com/documentation/avfaudio/avaudiosession/1616533-outputvolume

Detect hardware volume button press when volume not changed

let volumeView = MPVolumeView(frame: CGRect.zero)
self.view.addSubview(volumeView)
NotificationCenter.default.addObserver(self, selector: #selector(volumeChanged(_:)), name: NSNotification.Name(rawValue: "AVSystemController_SystemVolumeDidChangeNotification"), object: nil)

This will get called every press regardless of volume level

@objc func volumeChanged(_ notification: NSNotification) {
    if let volume = notification.userInfo!["AVSystemController_AudioVolumeNotificationParameter"] as? Float {
        print("volume: \(volume)")
    }
}

output:

volume: 0.8125
volume: 0.875
volume: 0.9375
volume: 1.0
volume: 1.0
volume: 1.0
volume: 1.0

get current system volume level on iPhone

musicPlayer = [[MPMusicPlayerController iPodMusicPlayer];

currentVolume = musicPlayer.volume;

This is now deprecated as of iOS8.0 so try the following

#import 

AVAudioSession *audioSession = [AVAudioSession sharedInstance];
CGFloat volume = audioSession.outputVolume;

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