如何從數據庫中的項目之前刪除「snap」

Question

我有一個函數從我的firebase數據庫中返回一個數組。問題是它總是在數據庫中返回值之前打印捕捉（數字，其中項目位於所以例如0），因此，例如，它將打印[snap（0）teamname]

我將如何擺脫這snap（num）在值的開始處。也許有某種框架從數組中刪除某些短語？讓我知道這裏是我的代碼和數據庫。

import UIKit 
import Foundation 
import Firebase 


class CSGOView: UIViewController, UITableViewDelegate, UITableViewDataSource{ 

    var teams: [String] = [] 
    var times: [String] = [] 




    @IBOutlet weak var tableViewTwo: UITableView! 
    let teamsRef = FIRDatabase.database().reference(fromURL: "can't have this info sorry, basically it goes straight to Teams in the database") 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     getTeamsAndTimes() 
    } 

    func getTeamsAndTimes() { 
     teamsRef.observeSingleEvent(of: .value, with: { (snapshot) in 
      let d = snapshot.children.allObjects 
      print(d) 
      for child in snapshot.children { 
       print(child) 
      } 
     }) { (error) in 
      print(error.localizedDescription) 
     } 
    } 


    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 
     return 3 
    } 


    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { 

     let cell: UITableViewCell? = nil 
     return cell! 

    } 

} 

這裏是顯示數據庫的圖像，以及它的佈局。

https://ibb.co/dSp5ka

，這裏是控制檯輸出

[Snap (0) FaZe Clan, Snap (1) Natus Vincere, Snap (2) Natus Vincere, Snap (3) FaZe Clan, Snap (4) HellRaisers, Snap (5) G2 Esports, Snap (6) G2 Esports, Snap (7) HellRaisers, Snap (8) NRG Esports, Snap (9) Counter Logic Gaming, Snap (10) Counter Logic Gaming, Snap (11) NRG Esports, Snap (12) OpTic Gaming, Snap (13) Rush, Snap (14) Rush, Snap (15) OpTic Gaming] 
Snap (0) FaZe Clan 
Snap (1) Natus Vincere 
Snap (2) Natus Vincere 
Snap (3) FaZe Clan 
Snap (4) HellRaisers 
Snap (5) G2 Esports 
Snap (6) G2 Esports 
Snap (7) HellRaisers 
Snap (8) NRG Esports 
Snap (9) Counter Logic Gaming 
Snap (10) Counter Logic Gaming 
Snap (11) NRG Esports 
Snap (12) OpTic Gaming 
Snap (13) Rush 
Snap (14) Rush 
Snap (15) OpTic Gaming 

Answer 1

您需要訪問snapshot.value讓你的隊名。

func getTeamsAndTimes() { 
    teamsRef.observeSingleEvent(of: .value, with: { (snapshot) in 
     self.teams = [] 
     for child in snapshot.children { 
      if let team = (child as! FIRDataSnapshot).value as? String { 
       self.teams.append(team) 
      }    
     } 
     //Reload the tabelView after that 
     self.tableViewTwo.reloadData() 
    }) { (error) in 
     print(error.localizedDescription) 
    } 
} 

現在numberOfRowsInSection回報teams陣列count，而不是3。

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 
    return self.teams.count 
} 


func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { 

    let cell = tableView.dequeueReusableCell(withIdentifier: "YourIdentifer", for: indexPath) 
    cell.textLabel?.text = teams[indexPath.row] 
    return cell 
}