Firebase + Swift TableView按日期排序

import UIKit
import Firebase

class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {

    @IBOutlet weak var tableView: UITableView!
    
    var databaseRef: DatabaseReference!
    var data: [DataModel] = []
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 初始化Firebase实时数据库
        databaseRef = Database.database().reference()
        
        // 从Firebase获取数据
        databaseRef.child("data").queryOrdered(byChild: "date").observe(.value, with: { snapshot in
            self.data.removeAll()
            
            for child in snapshot.children {
                if let snapshot = child as? DataSnapshot,
                   let data = DataModel(snapshot: snapshot) {
                    self.data.append(data)
                }
            }
            
            // 按日期排序
            self.data.sort { $0.date < $1.date }
            
            // 刷新TableView
            self.tableView.reloadData()
        })
        
        // 注册TableView的代理和数据源
        tableView.delegate = self
        tableView.dataSource = self
    }
    
    // TableView的代理方法
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return data.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
        let item = data[indexPath.row]
        cell.textLabel?.text = item.title
        cell.detailTextLabel?.text = item.dateString
        return cell
    }
}

struct DataModel {
    let title: String
    let date: Date
    let dateString: String
    
    init?(snapshot: DataSnapshot) {
        guard let value = snapshot.value as? [String: Any],
              let title = value["title"] as? String,
              let dateString = value["date"] as? String,
              let date = DateFormatter().date(from: dateString) else {
            return nil
        }
        
        self.title = title
        self.date = date
        self.dateString = dateString
    }
}