iOS Swift 如何在后台播放 AudioServicesPlaySystemSound 或 AudioServicesPlayAlertSound

Question

extension AppDelegate : UNUserNotificationCenterDelegate {

// Receive displayed notifications for iOS 10 devices.
func userNotificationCenter(_ center: UNUserNotificationCenter,
                            willPresent notification: UNNotification,
                            withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {

    let userInfo = notification.request.content.userInfo

    print("userNotificationCenter-UNNotificationPresentationOptions")
    // With swizzling disabled you must let Messaging know about the message, for Analytics
    Messaging.messaging().appDidReceiveMessage(userInfo)

    if let messageID = userInfo[gcmMessageIDKey] {
        print("Message ID: \(messageID)")
    }

    // Print full message.
    print(userInfo)

    // Change this to your preferred presentation option

//    AudioServicesPlayAlertSound(1016)
      AudioServicesPlaySystemSound(1016)
      completionHandler([.alert,.badge])
    }

如果 fcm 推送在前台发送音频正在播放

但在后台未播放音频

如何播放AudioServicesPlaySystemSound或AudioServicesPlayAlertSound在后台功能背景模式已检查

Swift 4、iOS 11

Answer 1

您必须设置播放音频的后台模式才能执行此操作。这个答案iOS background audio not playing中有详细描述。 .