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我正在尝试使用 firebase 在我们的 React Native 应用程序中实现丰富的通知。react native 还不支持丰富的通知，所以我不得不在我的 NotificationServiceExtension 中使用 swift，在我的 AppDelegate.m 中使用 Objective C。我在这两个方面都没有经验。如果应用程序在后台或关闭，丰富的通知会正确显示，但如果应用程序在前台，即使我总是得到它们（使用断点），它们也不会显示。奇怪的是，有时他们会...

class NotificationService: UNNotificationServiceExtension {
  var contentHandler: ((UNNotificationContent) -> Void)?
  var bestAttemptContent: UNMutableNotificationContent?
  override func didReceive(_ request: UNNotificationRequest, withContentHandler contentHandler: @escaping (UNNotificationContent) -> Void) {
    let title = request.content.title
    let subtitle = request.content.subtitle
    let body = request.content.body
    self.contentHandler = contentHandler
    bestAttemptContent = (request.content.mutableCopy() as? UNMutableNotificationContent)
    guard let bestAttemptContent = bestAttemptContent,
      let attachmentURLAsString = bestAttemptContent.userInfo["image"] as? String,
      let attachmentURL = URL(string: attachmentURLAsString) else {
        return
    }
    downloadImageFrom(url: attachmentURL, title: title, subtitle: subtitle, body: body) { (attachment) in
      if let attachment = attachment {
        bestAttemptContent.attachments = [attachment]
        contentHandler(bestAttemptContent)
      }
    }
  }
  private func downloadImageFrom(url: URL, title: String, subtitle: String, body: String, with completionHandler: @escaping (UNNotificationAttachment?) -> Void) {
    let task = URLSession.shared.downloadTask(with: url) { (downloadedUrl, response, error) in
      guard let downloadedUrl = downloadedUrl else {
        completionHandler(nil)
        return
      }
      var urlPath = URL(fileURLWithPath: NSTemporaryDirectory())
      let uniqueURLEnding = ProcessInfo.processInfo.globallyUniqueString + ".png"
      urlPath = urlPath.appendingPathComponent(uniqueURLEnding)
      try? FileManager.default.moveItem(at: downloadedUrl, to: urlPath)
      let notificationContent = UNMutableNotificationContent()
      notificationContent.title = title
      notificationContent.subtitle = subtitle
      notificationContent.body = body
      notificationContent.sound = UNNotificationSound.default
      notificationContent.badge = 0
      do {
        let attachment = try UNNotificationAttachment(identifier: "notifImg", url: urlPath, options: nil)
        notificationContent.attachments = [attachment]
        let request = UNNotificationRequest(identifier: "notif",
                                            content: notificationContent,
                                            trigger: nil)
        UNUserNotificationCenter.current().add(request) { (error) in
          completionHandler(attachment)
        }
        completionHandler(attachment)
      } catch {
        completionHandler(nil)
      }
    }
    task.resume()
  }
  override func serviceExtensionTimeWillExpire() {
    if let contentHandler = contentHandler, let bestAttemptContent =  bestAttemptContent {
      contentHandler(bestAttemptContent)
    }
  }
}

我从阅读的许多文章中获得了此代码。通知的批准请求在 AppDelegate 中。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
...
  [application registerUserNotificationSettings:
  [UIUserNotificationSettings settingsForTypes:(UIUserNotificationTypeBadge | 
    UIUserNotificationTypeSound | UIUserNotificationTypeAlert)
                                    categories:nil]];
  [application registerForRemoteNotifications];
...
}

我正在使用https://fcm.googleapis.com/fcm/send发送通知，如下所示：

{
    "notification": {
        "mutable_content": true,
        "title": "title",
        "body": "body"
    },
    "to" : "__token__",
    "data": {
        "image": "https://ilyarm.ru/assets/949163b5edd92aa1ec0379734-697x403.jpg"
    }
}

有人可以指导我或分享一些文章吗？非常感谢！

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