Swift 5- Firebase-使用从Firebase加载的数据将用户划分为多个部分

如何解决Swift 5- Firebase-使用从Firebase加载的数据将用户划分为多个部分

我有一个tableview，其中包含从firebase目录加载的目录中的用户列表。我的问题是，如何将它们放入类似于iPhone中的联系人应用程序的部分。我希望每个用户在相应的部分下按其姓名显示。

这是我的代码：

我的主视图控制器：

import UIKit
import Foundation
import Firebase
import FirebaseDatabase

class ViewController: UIViewController {
    
    //MARK: - variables for the textfield search
    @IBOutlet var field: UITextField!
    var filteredTable = [String]()
    
    //MARK: - Variables for the tableview data from Firebase
    var table = [FacStaffInfo]()
    var ref: DatabaseReference!

    
    @IBOutlet weak var Tableview: UITableView!

    override func viewDidLoad() {
        super.viewDidLoad()
        
        //MARK: - setting the delegate for the test field for filter
        
        field.delegate = self

        //MARK: - This is all the functionality for the loading from Firebase to the TableView

        ref = Database.database().reference().child("users")
        
        ref.observe(DataEventType.value,with: {(snapshot) in
            if snapshot.childrenCount > 0 {
                self.table.removeAll()
                
                for user in snapshot.children.allObjects as! [DataSnapshot] {
                    
                    let object = user.value as? [String: AnyObject]
                    let title = object?["title"]
                    let name = object?["name"]
                    let email = object?["email"]
                    let phone = object?["phone"]
                    let office = object?["office"]
                    let bio = object?["bio"]

                    let user = FacStaffInfo(title: title as! String,name: name as! String,email: email as! String,phone: phone as! Int,office: office as! String,bio: bio as! String)

                    self.table.append(user)
                    
                        self.Tableview.reloadData()
                    
                    
                    
                }
            }
        })
        
    }
}


//MARK: - add the tableview functions

extension ViewController: UITableViewDataSource,UITableViewDelegate {
    func tableView(_ tableView: UITableView,numberOfRowsInSection section: Int) -> Int {
        
        //MARK: - adding functionality for textfield search
        if !filteredTable.isEmpty {
            return table.count
            
        }
        
        //MARK: - just returning the array from the database,keep if remove textfield crap
        return table.count
    }
    
    func tableView(_ tableView: UITableView,cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "userCell") as! TableViewCell
        
        let user: FacStaffInfo
        
        user = table[indexPath.row]
        cell.titleLabel?.text = user.title
        cell.nameLabel?.text = user.name
        cell.emailLabel?.text = user.email
        cell.phoneLabel?.text = String(user.phone)
        cell.officeLabel?.text = user.office
        cell.bioLabel?.text = user.bio
        
        //MARK: - testing using arrays to filter tableview data
        
//        if !filteredTable.isEmpty {
//            cell.textLabel?.text = filteredTable[indexPath.row]
//        }
//        else {
//            cell.textLabel?.text = table.
//        }
//
//
//
//
//
       return cell


    }
    
    func tableView(_ tableView: UITableView,didSelectRowAt indexPath: IndexPath) {
            performSegue(withIdentifier: "showDetail",sender: self)
            }
    
    
    
    override func prepare(for segue: UIStoryboardSegue,sender: Any?) {
        if segue.identifier == "showDetail" {

            if let indexPath = Tableview.indexPathForSelectedRow {
                let destinationController = segue.destination as! InfoViewController

                destinationController.FacStaffData = table[indexPath.row]
            }
        }
    }
}

这是我的数据模型

import Foundation
import Firebase
import FirebaseDatabase


class FacStaffInfo {
    
    var title: String
    var name: String
    var email: String
    var phone: Int
    var office: String
    var bio: String
    
    init(title: String,name: String,email: String,phone: Int,office: String,bio: String) {
        self.title = title;
        self.name = name;
        self.email = email;
        self.phone = phone;
        self.office = office;
        self.bio = bio
        
        
        
    }
}

这是我的表格视图单元格

import UIKit
import Firebase
import FirebaseDatabase

class TableViewCell: UITableViewCell {
  
    @IBOutlet weak var titleLabel: UILabel!
    @IBOutlet weak var nameLabel: UILabel!
    @IBOutlet weak var emailLabel: UILabel!
    @IBOutlet weak var phoneLabel: UILabel!
    @IBOutlet weak var officeLabel: UILabel!
    @IBOutlet weak var bioLabel: UILabel!

    
    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
    }

    override func setSelected(_ selected: Bool,animated: Bool) {
        super.setSelected(selected,animated: animated)

        // Configure the view for the selected state
    }
}

解决方法

雨燕5

声明您的课程，如下所示：

class ViewController: UIViewController
{
    // MARK: Outlets
    
    @IBOutlet weak var Tableview: UITableView!
    @IBOutlet weak var field: UITextField!
    
    // MARK: Properties
    
    var sectionNames: [String] = []
    var users: [String: [FacStaffInfo]] = [:]
    
    var ref: DatabaseReference!

    // MARK: View Controller Life Cycle
    
    override func viewDidLoad()
    {
        super.viewDidLoad()
        getUsersFromFirebaseDB()
    }
    
    deinit
    {
        ref.removeAllObservers()
    }
    
    // MARK: Private Methods
    
    private func usersFetched(_ usersData: [FacStaffInfo])
    {
        for user in usersData
        {
            guard let userNameFirstChar = user.name.first?.uppercased() else { continue }
            if var usersForKey = users["\(userNameFirstChar)"]
            {
                usersForKey.append(user)
                users["\(userNameFirstChar)"] = usersForKey
            }
            else
            {
                // no users are stored in dictionary for key userNameFirstChar
                users["\(userNameFirstChar)"] = [user]
            }
        }
    
        // sort dictionary keys and set it in sectionNames
        sectionNames = users.map { $0.key }.sorted()
    }
    
    private func getUsersFromFirebaseDB()
    {
        ref = Database.database().reference().child("users")
        ref.observe(DataEventType.value,with: { [weak self] (snapshot) in
    
            guard snapshot.childrenCount > 0 else { return }
    
            var users: [FacStaffInfo] = []
            for user in snapshot.children.allObjects as! [DataSnapshot]
            {
                let object = user.value as? [String: AnyObject]
    
                let title = object?["title"]
                let name = object?["name"]
                let email = object?["email"]
                let phone = object?["phone"]
                let office = object?["office"]
                let bio = object?["bio"]
    
                let user = FacStaffInfo(title: title as! String,name: name as! String,email: email as! String,phone: phone     as! Int,office: office as! String,bio: bio as! String)
                users.append(user)
            }
    
            self?.usersFetched(users)
            self?.Tableview.reloadData()
        })
    }
    
    // MARK: Navigation
    
    override func prepare(for segue: UIStoryboardSegue,sender: Any?)
    {
        if segue.identifier == "showDetail"
        {
            if let indexPath = Tableview.indexPathForSelectedRow
            {
                let destinationController = segue.destination as! InfoViewController
                let char = sectionNames[indexPath.section]
                let user = users[char]![indexPath.row]
                destinationController.FacStaffData = user
            }
        }
    }
}

此外，添加以下扩展名：

extension ViewController: UITableViewDataSource,UITableViewDelegate
{
    func numberOfSections(in tableView: UITableView) -> Int
    {
        sectionNames.count
    }

    func tableView(_ tableView: UITableView,titleForHeaderInSection section: Int) -> String?
    {
        sectionNames[section]
    }

    func tableView(_ tableView: UITableView,numberOfRowsInSection section: Int) -> Int
    {
        let char = sectionNames[section]
        return users[char]!.count
    }

    func tableView(_ tableView: UITableView,cellForRowAt indexPath: IndexPath) -> UITableViewCell
    {
        let cell = tableView.dequeueReusableCell(withIdentifier: "userCell") as! TableViewCell
        let char = sectionNames[indexPath.section]
        let user = users[char]![indexPath.row]
        cell.nameLabel?.text = user.name
        return cell
    }

    func tableView(_ tableView: UITableView,didSelectRowAt indexPath: IndexPath)
    {
        performSegue(withIdentifier: "showDetail",sender: self)
        tableView.deselectRow(at: indexPath,animated: true)
    }
}

输出