Set the slider value based on the AVAudiosession volume || mobile system volume based slider change in iOS swift

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Solution:

 If you are adjusting the volume in your phone volume button based on slider change you can follow the below steps


    override func viewDidDisappear(_ animated: Bool) {
        AVAudioSession.sharedInstance().removeObserver(self, forKeyPath: "outputVolume")
        do { try AVAudioSession.sharedInstance().setActive(false) }
        catch { debugPrint("\(error)") }
    }
    
    func listenVolumeButton() {
        let audioSession = AVAudioSession.sharedInstance()

        do {
            try audioSession.setActive(true)
        } catch {
            print("some error")
        }
        audioSession.addObserver(self, forKeyPath: "outputVolume", options: NSKeyValueObservingOptions.new, context: nil)
    }
    
    override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
        if keyPath == "outputVolume" {
            print("got in here")
            volumeBar.setValue((AVAudioSession.sharedInstance().outputVolume*10), animated: true)
        }
    }


when initially set the value to your slider then follow the below steps.If you tap play button then slider will set the default value


    //    MARK: - DidTapOnPlay
    @IBAction func didTapOnPlay(_ sender: Any) {
        print("audio",AVAudioSession.sharedInstance().outputVolume)
        let session = AVAudioSession.sharedInstance()
        do {
            try session.setActive(true)
        } catch let error as NSError {
            print(error.localizedDescription)
        }
        print("audio",session.outputVolume)

        volumeBar.setValue((session.outputVolume*10), animated: true)
}

you must have to do the below steps in disappear otherwise app will crash


 override func viewDidDisappear(_ animated: Bool) {
        AVAudioSession.sharedInstance().removeObserver(self, forKeyPath: "outputVolume")
        do { try AVAudioSession.sharedInstance().setActive(false) }
        catch { debugPrint("\(error)") }
    }

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