Detect volume button press

Question

Volume button notification function is not being called.

Code:

func listenVolumeButton(){
    // Option #1
    NSNotificationCenter.defaultCenter().a         


        

Answer 1

The code above won't work in Swift 3, in that case, try this:

func listenVolumeButton() {
   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")
  }
}