[FIXED] How to detect volume button press on tvOS remote

Issue

Im trying to find a way to observe the player so that I can detect when a user increases or decreases the volume on the Apple TV. I have managed to get this to work for iOS by using:

 var audioSession: AVAudioSession?

 audioSession?.addObserver(self, forKeyPath: "outputVolume", options: [.new], context: &videoPlayerViewControllerKVOContext)


 if keyPath == "outputVolume" {
        guard let mute = (change?[NSKeyValueChangeKey.newKey] as? NSNumber)?.floatValue else {
            return
        }
        
        var isMuted = false
        
        if (mute == 0) && (!player.isMuted) {
            isMuted = true
        } else if (mute.isZero) && (player.isMuted) {
            isMuted = false
        }
        
    }

However this doesn't work for tvOS. Is there a way to do this on tvOS?

Solution

It is not clear all other code, but you have to keep reference to created observer.

Here is possible solution (tested with Xcode 12.1)

private var observer: NSKeyValueObservation?

// ... other code

self.observer = audioSession?.observe(\.outputVolume) { [weak self] (audioSession, _) in
    guard let `self` = self else { return }
    let mute = audioSession.outputVolume
    
    var isMuted = false
    if (mute == 0) && (!self.player.isMuted) {
        isMuted = true
    } else if (mute.isZero) && (self.player.isMuted) {
        isMuted = false
    }
    
    // do what's needed here with `isMuted`
}

Answered By - Asperi

Answer Checked By - Pedro (PHPFixing Volunteer)