tableview单元格上详细文本标签不会使用倒计时计时器刷新

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
    cell.detailTextLabel?.text = "详细文本"
    return cell
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
    
    // 添加倒计时Label
    let countdownLabel = UILabel(frame: CGRect(x: 0, y: 0, width: 100, height: 20))
    countdownLabel.textAlignment = .right
    countdownLabel.textColor = .red
    countdownLabel.tag = 100 // 用于标识倒计时Label
    cell.accessoryView = countdownLabel
    
    cell.detailTextLabel?.text = "详细文本"
    return cell
}

func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
    let countdownLabel = cell.accessoryView as? UILabel
    countdownLabel?.text = "倒计时开始的时间"
    
    // 开始倒计时
    startCountdownTimer(for: countdownLabel)
}

func startCountdownTimer(for label: UILabel?) {
    guard let countdownLabel = label else {
        return
    }
    
    // 创建并启动倒计时计时器
    let timer = Timer.scheduledTimer(withTimeInterval: 1.0, repeats: true) { timer in
        // 更新倒计时Label的显示
        countdownLabel.text = "更新后的倒计时时间"
        
        // 判断倒计时是否结束，若结束则停止计时器
        if countdownLabel.text == "倒计时结束的条件" {
            timer.invalidate()
        }
    }
    
    // 将计时器添加到当前RunLoop中
    RunLoop.current.add(timer, forMode: .common)
}