ios - 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

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"
]

然后你可以提取标题和艺术家

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