AVAudioPlayer fade volume out

Question

I have an AVAudioPlayer playing some audio (duh!)

The audio is initiated when the user presses a button. When they release it I want the audio to fade out.

I

Answer 1

An extension for swift 3 inspired from the most voted answer. For those of you who like copy-pasting :)

extension AVAudioPlayer {
    func fadeOut() {
        if volume > 0.1 {
            // Fade
            volume -= 0.1
            perform(#selector(fadeOut), with: nil, afterDelay: 0.1)
        } else {
            // Stop and get the sound ready for playing again
            stop()
            prepareToPlay()
            volume = 1
        }
    }
}