如何在 jsonObject swift 中获取 jsonObject 的值 4.

Question

我使用 FCM 向我的 iOS 应用程序发送推送通知。当用户点击通知托盘时，数据处理由以下功能处理：

func userNotificationCenter(_ center: UNUserNotificationCenter,
                                didReceive response: UNNotificationResponse,
                                withCompletionHandler completionHandler: @escaping () -> Void) {
        let userInfo = response.notification.request.content.userInfo
        print(userInfo['data'])
}

userInfo是[AnyHashable:Any]类型。我成功地从userInfo['data']获取数据。所以这是userInfo['data']的数据结构：

'{"data":
   {
    "title":"My app",
    "message":"The message here",
    "payload":{
        "post_id":"602"
        },
    "timestamp":"2018-03-10 14:12:08"
    }
 }'

这是我尝试的方式：

 if let dataString = userInfo["data"] as? String {
        let data = dataString.data(using: .utf8)!
        do {
            if let json = try JSONSerialization.jsonObject(with: data, options : .allowFragments) as? [String : Any]
            {
                let message = json["message"] as? String ?? "No message here"
                let title = json["title"] as String ?? ""
                //here is the problem..I have no idea to do it here
                let payload = json["payload"] as? [String : Int] ?? [:]
                for element in payload {
                    if let postId = element["post_id"] {
                        //print("postId = (postId)")
                    }

                }
            } else {
                print("bad json")
            }
    } catch let error as NSError {
        print(error)
    }

所以如上所示，我在 data json 中获取 title 、message 和 timestamp 的值没有问题。

但是我必须知道如何获取数组payload post_id的值。

那么在这种情况下，如何从上面的data json中获取post_id的值呢？谢谢。

Answer 1

像

这样访问帖子ID

   func userNotificationCenter(_ center: UNUserNotificationCenter,
                                didReceive response: UNNotificationResponse,
                                withCompletionHandler completionHandler: @escaping () -> Void) {
        let userInfo = response.notification.request.content.userInfo
        if let data = userInfo["data"] as? [String: Any],
            let payload = data["payload"] as? [String: Any],
            let postId = payload["post_id"] as? String{
            print("post id (postId)")
        }else{
            print("there is no post id inside the payload")
        }
    }