操作无法完成。 （OSStatus 错误 561015905。）

Question

当我的应用程序处于静音模式和终止状态时，我需要在我的 iOS 应用程序中接收推送通知时播放声音。 下面的代码不起作用，返回错误操作无法完成。 （OSStatus 错误 561015905。）

NotificationService.swift

导入用户通知

导入 AVFoundation

导入媒体播放器

类 NotificationService：UNNotificationServiceExtension {

var contentHandler: ((UNNotificationContent) -> Void)?
var bestAttemptContent: UNMutableNotificationContent?

var audioPlayer = AVAudioPlayer()

override func didReceive(_ request: UNNotificationRequest, withContentHandler contentHandler: @escaping (UNNotificationContent) -> Void) {
    self.contentHandler = contentHandler
    bestAttemptContent = (request.content.mutableCopy() as? UNMutableNotificationContent)
    playSound()
    if let bestAttemptContent = bestAttemptContent {
        contentHandler(bestAttemptContent)
    }
}

override func serviceExtensionTimeWillExpire() {
    // Called just before the extension will be terminated by the system.
    // Use this as an opportunity to deliver your "best attempt" at modified content, otherwise the original push payload will be used.
    if let contentHandler = contentHandler, let bestAttemptContent =  bestAttemptContent {
        contentHandler(bestAttemptContent)
    }
}

}

扩展通知服务{

//MARK: - Set up
private func playSound() {
    do {
        try AVAudioSession.sharedInstance().setCategory(AVAudioSession.Category.playback)

        try AVAudioSession.sharedInstance().setActive(true)
        if let url = URL(string: "file:///private/var/mobile/Containers/Shared/AppGroup/9A4FCED-7432FE-FEW-A559-234FBW/Library/Sounds/Update.caf") {
            audioPlayer = try AVAudioPlayer(contentsOf: url,  fileTypeHint: AVFileType.caf.rawValue)
            audioPlayer.volume = 1.0
            DispatchQueue.main.asyncAfter(deadline: .now() + 5) { // Give 5 sec delay to play audio or else audio will not hearable
                self.audioPlayer.play()
            }
        }
    } catch {
        print("[SoundPlayer] There was an error \(error.localizedDescription):")
    }
    
    if (audioPlayer.isPlaying) {
        audioPlayer.stop()
    }
    audioPlayer.play()
}

}