Swift firebase timestamp cant show - ios

Question

I am able to retrieve and convert my timestamp that I got from firebase(i did a breakpoint at that line and my time shows 5/3/18,3:05 PM, so it's fine), below is my code:
func loadMsg() {
let toId = user!.id!
let fromId = Auth.auth().currentUser!.uid
let chatRoomId = (fromId < toId) ? fromId + "_" + toId : toId + "_" + fromId
let ref = Database.database().reference().child("privateMessages").child(chatRoomId)
ref.observe(.value) { (snapshot) in
ref.observeSingleEvent(of: .childAdded, with: { (datasnap) in
let lastMsgTime = (datasnap.value as! [String: AnyObject])["timestamp"] as? Double
// to get timestamp and convert to date and time
let x = lastMsgTime!
let date = NSDate(timeIntervalSince1970: x)
let formatter = DateFormatter()
formatter.dateStyle = .short
formatter.timeStyle = .short
let time = formatter.string(from: date as Date)
self.message.timestamp = time //HERE IT CRASHES!!!!!
if let snapshot = snapshot.children.allObjects as? [DataSnapshot] {
self.messages.removeAll()
for data in snapshot {
let newMsg = Message(dictionary: data.value as! [String: AnyObject])
self.messages.append(newMsg)
}
}
})
DispatchQueue.main.async {self.tableView.reloadData()}
}
}
However it crashes at the line which i commented above, i was supposed to show it on my tableviewCell in my message cell. My tableView cell was done by xib which looks like :
and the code of my tableviewCell would be:
{
self.message = message
if message.fromId == currentUser {
sentView.isHidden = false
sentMsgLabel.text = message.textMessages
receivedMsgLabel.text = ""
receivedView.isHidden = true
timeReceived.text = message.timestamp
timeSent.text = message.timestamp
} else {
sentView.isHidden = true
sentMsgLabel.text = ""
receivedMsgLabel.text = message.textMessages
receivedMsgLabel.isHidden = false
timeReceived.text = message.timestamp
timeSent.text = message.timestamp
}
}
So, why would it crash and says
"Thread 1: Fatal error: Unexpectedly found nil while unwrapping an
Optional value"
my message class code:
class Message: NSObject {
var fromId: String?
var textMessages: String?
var timestamp: String?
var toId: String?
var message: Message!
var _messageKey: String!
init(dictionary: [String: Any]) {
self.fromId = dictionary["fromId"] as? String
self.textMessages = dictionary["textMessages"] as? String
self.toId = dictionary["toId"] as? String
self.timestamp = dictionary["timestamp"] as? String
}
init(messageKey: String, postData: Dictionary<String, AnyObject>) {
_messageKey = messageKey
if let message = postData["textMessages"] as? String {
textMessages = message
}
if let sender = postData["fromId"] as? String {
fromId = sender
}
}
}
I believe there isnt any issue with my firebase, main problem is at the tableview cell, why wouldnt it show?

Answer 1

Try to get timestamp from server like this:
ServerValue.timestamp()