swift - 从 swift 检索 firebase 数据

Question

我正在尝试从 Firebase RealTime 数据库检索数据，以便将其放入将用于在 TableView 上显示数据的列表中。

我的问题是，即使我获得了一些数据，我也没有足够的知识来访问数组和其他 swift 对象。也许，我没有用好的方式来做我想做的事。

以下是 Firebase 上的行示例:

这是一个用 Swift 编写的函数，我试图在其中为每个行对象构建一个列表。

func displayStationsUsingSearch(){


    let station = self.stationName
    let CP = Int(self.searchedCP!)

    // create searchRef or queryRef you name it
    let stationsRef = Database.database().reference().child("Stations")
    stationsRef.observeSingleEvent(of: .value, with: { (snapshot) in
        print(snapshot)
        /*if snapshot.value is NSNull {
            print("not found")
        } else {
            // yes we got the user
            let id = snapshot.value as! Int
        }*/
        for child in snapshot.children {

            stationsRef.queryOrdered(byChild: "marque")
                .queryEqual(toValue: "TOTAL ACCESS")
                .observe(.value, with: { snap in

                    if let dict = snap.value as? [String: AnyObject] {
                        /*self.stationItem!.nomStation = dict["nomStation"] as! String
                        self.stationItem!.adresse = dict["adresse"] as! String
                        self.stationItem!.codePostal = dict["codePostal"] as! String
                        self.stationItem!.ville = dict["ville"] as! String
                        self.stationItem!.marque = dict["marque"] as! String
                        self.stationItem!.pays = dict["pays"] as! String
                        self.stationItem!.commentaire = dict["commentaire"] as! String
                        self.stationItem!.coordGPS = dict["coordGPS"] as! String*/
                        print(dict["nomStation"] as! String)
                    }
            })

        }
    })
}

Xcode 工作区上的 lldb 显示:

Printing description of child:
Snap (-LdA6X8CfNY3bsPni31U) {
"DIESEL EXCELLIUM" = 0;
"DIESEL ULTIMATE" = 0;
GAZOLE = 0;
GPL = 0;
SP95 = 0;
"SP95 E10" = 0;
SP98 = 0;
SUPER = 0;
adresse = "RN1 Direction Moisselles";
codePostal = 95570;
commentaire = "";
coordGPS = "";
createdAt = "31/07/2018";
heureDebut = "";
heureFin = "";
id = 0;
marque = ESSO;
modifiedAt = "23/04/2019 18:53";
nomStation = "ESSO Moisselles";
pays = "";
saufJour = "";
services = "";
typeRoute = "";
ville = Moisselles;
}
(lldb) 

您能帮我检索列表中的数据吗？我可以附加该列表以在表格 View 上显示数据？谢谢。

Answer 1

尝试类似的事情:

Database.database().reference()
  .child("Stations").
  observeSingleEvent(of: .value, with: { (snapshot) in 
    guard let value = snapshot.value as? [String: Any] else {
      return
    }

    var stations = [Station]()
    for (key, value) in values {
      guard let station = value as? [String: Any],
          let adresse = station["adresse"] as? String,
          let codePostat = station["codePostat"] as? String else {
              continue
          }
          stations.append(Station(adresse: adresse, codePostat: codePostat))
    }

    // if you have some completion return retrieved array of stations
    completion(stations)
})

struct Station {

  private let adresse: String
  private let codePostat: String

  init(adresse: String, codePostat: String) {

    self.adresse = adresse
    self.codePostat = codePostat
  }
}