如何在iPhone中处于静音模式时使用AVAudioPlayer播放声音

do {
    try AVAudioSession.sharedInstance().setCategory(.playback, mode: .default, options: [])
    try AVAudioSession.sharedInstance().setActive(true, options: [])
} catch let error as NSError {
    print("Error: \(error.localizedDescription)")
}

let audioPlayer = AVAudioPlayer()

func playAudio() {
    if let url = Bundle.main.url(forResource: "audio", withExtension: "mp3") {
        do {
            audioPlayer.setAudioFileURL(url)
            audioPlayer.prepareToPlay()
        } catch let error as NSError {
            print("Error: \(error.localizedDescription)")
        }
    }
}

playAudio()

audioPlayer.stop()