为什么推送通知中的有效负载为零？

Question

我使用 Parse.com 的推送服务将数据保存到推送通知，但是当我打印负载时。它似乎是零。为什么会发生这种情况，我该如何解决？谢谢。任何帮助表示赞赏。

func pushNotifications(){

    let data = [
        "alert" : "\(username!) wants you to listen to \(titleofsong) by \(artist)",
        "identifier":"PlayerController",  "title" : "test title", "artist" : "test artist"
    ]
    let push = PFPush()
    push.setQuery(pushQuery)
    push.setData(data)
    push.sendPushInBackgroundWithBlock {
        success, error in

        if success {
            print("The push succeeded.")
        } else {
            print("The push failed.")
        }
    }
}

func application(application: UIApplication, didReceiveRemoteNotification userInfo: [NSObject : AnyObject]) {
    PFPush.handlePush(userInfo)
    let title = userInfo["aps"]!["title"]
    let artist = userInfo["aps"]!["artist"]
    print(title)
    print(artist)
}

Answer 1

相反，我认为您应该打印出 userInfo 中的内容。从 Parse.com 文档中，您不需要在从 userInfo 检索自定义数据之前检索 aps，如下所示：

let title = userInfo["title"]
let artist = userInfo["artist"]

我没有实际测试，我根据Parse文档得出了这个结论：https://parse.com/docs/ios/guide#push-notifications-responding-to-the-payload

来自 Parse.com 的发送示例：

let data = [
  "alert" : "James commented on your photo!",
  "p" : "vmRZXZ1Dvo" // Photo's object id
]
let push = PFPush()
push.setQuery(photoOwnerQuery)
push.setData(data)
push.sendPushInBackground()

来自 Parse.com 的接收示例：

func application(application: UIApplication,  didReceiveRemoteNotification userInfo: [NSObject : AnyObject],  fetchCompletionHandler completionHandler: (UIBackgroundFetchResult) -> Void) {
  if let photoId: String = userInfo["p"] as? String {
    let targetPhoto = PFObject(withoutDataWithClassName: "Photo", objectId: photoId)
    targetPhoto.fetchIfNeededInBackgroundWithBlock { (object: PFObject?, error: NSError?) -> Void in
      // Show photo view controller
      if error != nil {
        completionHandler(UIBackgroundFetchResult.Failed)
      } else if PFUser.currentUser() != nil {
        let viewController = PhotoVC(withPhoto: object)
        self.navController.pushViewController(viewController, animated: true)
        completionHandler(UIBackgroundFetchResult.NewData)
      } else {
        completionHandler(UIBackgroundFetchResult.NoData)
      }
    }
  }
  handler(UIBackgroundFetchResult.NoData)
}

Answer 2

根据 documentation 你的 APNS 负载应该看起来像

let data = [
  "aps" : [
    "alert" : [
      "title" : "New Request",
      "body" : "\(username!) wants you to listen to \(titleofsong) by \(artist)",
      "action-loc-key" : "Listen"
    ],
  ],
  "username" : "test user",
  "identifier" : "PlayerController",
  "title" : "test title",
  "artist" : "test artist"
]

然后您可以使用

提取标题和艺术家

let title = userInfo["title"]
let artist = userInfo["artist"]

为什么推送通知中的有效负载为零？

Why is the payload in the push notification nil?

push-notification

ios

parse-platform

swift