将Firebase快照数据推送到UIViewController元素

Question

我有一个Firebase数据库，可以在其中获取特定用户的快照。在Xcode中，我有一个显示用户的表格视图，当我选择一行时，快照将正确地打印在控制台中。当我尝试将快照数据传递到单击该行时显示的视图时，会出现问题，目前我无法从被单击的用户那里获取特定数据，而只能从其中一个获取数据。仅用户，这是其数据首先添加到数据库中的用户。

我知道传递值的原理如下：

   override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        let snapshot = rideRequest[indexPath.row]

        performSegue(withIdentifier: "AppointmentRequest", sender: snapshot)
        print(snapshot)

    }



    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

        if segue.identifier == "AppointmentRequest" {
            if let detailedRideVC = segue.destination as? AppoinemntRequestViewController {
                if let snapshot = sender as? DataSnapshot {
                    if let rideDictionary = snapshot.value as? [String:AnyObject] {
                        if let email = rideDictionary["email"] as? String {
                            if let fullname = rideDictionary["fullname"] as? String {
                                if let status = rideDictionary["Accepted"] as? Bool {
                                    detailedRideVC.requestEmail = email
                                    detailedRideVC.email = email
                                    detailedRideVC.status = status
                                    detailedRideVC.fullname = fullname
                                    //                                let location = CLLocationCoordinate2D(latitude: lat, longitude: long)
                                    //                                detailedRideVC.requestLocation = location
                                    //                                detailedRideVC.driverLocation = self.driverLocation
                                }
                            }
                        }

                    }

                }
            }
        }

在第二个视图控制器中，我正在使用以下方法尝试显示快照中的数据，但是它不起作用：

func setupRequest(){
    let uid = Auth.auth().currentUser?.uid
    Database.database().reference().child("users").child(mainUser.key).child("AppointmentRequests").observe(.childAdded){ (snapshot) in
        if let rideDictionary = snapshot.value as? [String:AnyObject] {
            let email = rideDictionary["email"] as? String
            let style = rideDictionary["styles"] as? String
            let date = rideDictionary["date"] as? String
            let fullname = rideDictionary["fullname"] as? String
            let time = rideDictionary["time"] as! String
            let shopname = rideDictionary["shopname"] as? String
            let phone = rideDictionary["phone"] as? String
            let cost = rideDictionary["cost"] as! Double
            let clientImage = rideDictionary["clientID"] as? String
            let status = rideDictionary["Accepted"] as? Bool

            if self.status == true {
                self.appointButton.isEnabled = false
                self.appointButton.setTitle("Accepted", for: .normal)
            } else {
                self.appointButton.isEnabled = true
                self.appointButton.setTitle("Accept", for: .normal)
            }

            self.shopName.text = email
            self.appointmentDateTime.text = date
            self.clientName.text = fullname
            self.styleName.text = "Style:" + " " + style!
            self.styleTime.text = time
            self.ShopIs.text = shopname
            self.styleCost.text = "USD" + "$" + "\(String(describing: cost))"
            self.shopNumber.text = "Tel:" + " " + phone!
            let ref = Storage.storage().reference(withPath: "users/" + clientImage! + "/avatar.jpeg");

            ref.downloadURL(completion: { (url, error) in
                if (url != nil)
                {
                    self.clientProfilePic.kf.setImage(with: url);
                }
            })

        }

    }

在解决此问题方面的任何帮助将不胜感激。