How to get value of jsonObject inside a jsonObject swift 4? - json

Question

I use FCM to send push notification to my iOS app.When user click on the notification tray,the data handle by the function below:
func userNotificationCenter(_ center: UNUserNotificationCenter,
didReceive response: UNNotificationResponse,
withCompletionHandler completionHandler: #escaping () -> Void) {
let userInfo = response.notification.request.content.userInfo
print(userInfo['data'])
}
The userInfo is a [AnyHashable:Any] type.I successfully get the data from the userInfo['data'].So here is the data structure for userInfo['data'] :
'{"data":
{
"title":"My app",
"message":"The message here",
"payload":{
"post_id":"602"
},
"timestamp":"2018-03-10 14:12:08"
}
}'
Here is how I tried :
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)
}
So as shown in above,I have no problem to get value of title,message and timestamp inside the data json.
But I have to idea how to get the value of post_id which is inside payload array.
So in this case,how to get the value of post_id from the data json above? Thanks.

Answer 1

Access post id like this
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")
}
}