通过 FCM 的 iOS 严重警报

Question

iOS 12 添加了严重警报。 APNS 负载具有 sound dictionary支持关键警报。 FCM 有效负载中是否有等效的声音字典支持以向 iOS 设备发送 FCM 通知。

Answer 1

回答我自己的问题。

由于 FCM 负载不支持 iOS 声音词典，我不得不依靠通知扩展来实现这一神奇效果。我将设置为 1 的“关键”标志作为 FCM 数据负载的一部分发送，并在通知扩展中使用它来将通知标记为关键。

class NotificationService: UNNotificationServiceExtension {
    var contentHandler: ((UNNotificationContent) -> Void)?
    var bestAttemptContent: UNMutableNotificationContent?

    override func didReceive(_ request: UNNotificationRequest, withContentHandler contentHandler: @escaping (UNNotificationContent) -> Void) {
       self.contentHandler = contentHandler
       bestAttemptContent = (request.content.mutableCopy() as? UNMutableNotificationContent)
       let userInfo: [AnyHashable : Any] = (bestAttemptContent?.userInfo)!
       if let apsInfo = userInfo["aps"] as? [AnyHashable: Any], let bestAttemptContent = bestAttemptContent, let critical =  userInfo["critical"] as? String, Int(critical)! == 1 {
            //critical alert try to change the sound if sound file is sent in notificaiton.
            if let sound = apsInfo["sound"] as? String {
                //sound file is present in notification. use it for critical alert..
                bestAttemptContent.sound =
                    UNNotificationSound.criticalSoundNamed(UNNotificationSoundName.init(sound),
                                                           withAudioVolume: 1.0)
            } else {
                //sound file not present in notifiation. use the default sound.
                bestAttemptContent.sound =
                                UNNotificationSound.defaultCriticalSound(withAudioVolume: 1.0)
            }
            contentHandler(bestAttemptContent)
        }
    }
}