如何为UITableView触发下载的单元格绑定对应接口的fileID

我从API获取了相关数据并展示在tableView单元格中，每个单元格都配有"Download"下载按钮，我需要将接口返回的fileID绑定到用户选中触发下载操作的对应单元格上。
我已经将按钮关联配置到了自定义UITableViewCell类中，由于每个单元格都对应独立的fileID，现需要实现点击任意单元格的下载按钮时，可准确获取该单元格对应fileID的逻辑。

paymentsViewController 类现有代码 #

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    
     return data?.count ?? 0
}


func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    guard let cell = tableView.dequeueReusableCell(withIdentifier: "paymentsCell", for: indexPath) as? paymentsModel else {return UITableViewCell()}
    
    let currentInvoice = payments.Result![changeCustomerKey.DefaultsKeys.keyTwo].properties?[0].payments
    let currentInvoices = currentInvoice?[indexPath.row]
    
    cell.priceLabelPayments?.text = "€\(currentInvoices?.amount ?? 0.00)"
    cell.whenDateLabel?.text = "\(currentInvoices?.insertionDate?.convertToDisplayForm() ?? "")"
    cell.fromSubLabel.text = "\(currentInvoices?.bank ?? "")"
    
    cell.downloadButtonPayments.layer.cornerRadius = CGFloat(5)
    cell.localizePaymentsModel()
    
    return cell
    }
}

paymentsModel 类现有代码 #

class paymentsModel: UITableViewCell {

@IBOutlet weak var cellContentViewPayments: UIView!

@IBOutlet weak var downloadButtonPayments: UIButton!
@IBOutlet weak var priceLabelPayments: UILabel!
@IBOutlet weak var fromSubLabel: UILabel!
@IBOutlet weak var whenDateLabel: UILabel!

func localizePaymentsModel() {
    
    let defaults = UserDefaults.standard
    let lang = defaults.string(forKey: changeLanguageKey.DefaultsKeys.keyOne)
    
    downloadButtonPayments.setTitle(NSLocalizedString("Download", tableName: nil, bundle: changeLanguage.createBundlePath(lang: lang ?? "sq" ), value: "", comment: ""), for: UIControl.State.normal)
   }
}

用闭包回调的方式实现最稳妥，不会因为cell复用出现数据错位问题，不要用给button绑定tag、cell存fileID属性的方案，这两种在cell复用时很容易出现ID匹配错误的问题。修改步骤如下：

1. 修改自定义cell类paymentsModel，添加下载按钮点击的回调闭包，在cell的初始化方法里给按钮绑定点击事件
2. 在cellForRowAt方法中给cell的回调闭包赋值，闭包内直接捕获当前行对应的模型数据，就能拿到准确的fileID
3. 点击按钮时触发回调，在控制器层执行下载逻辑即可

修改后的paymentsModel代码 #

class paymentsModel: UITableViewCell {

    @IBOutlet weak var cellContentViewPayments: UIView!
    @IBOutlet weak var downloadButtonPayments: UIButton!
    @IBOutlet weak var priceLabelPayments: UILabel!
    @IBOutlet weak var fromSubLabel: UILabel!
    @IBOutlet weak var whenDateLabel: UILabel!
    
    // 下载按钮点击回调
    var downloadTapAction: (() -> Void)?

    override func awakeFromNib() {
        super.awakeFromNib()
        // 绑定按钮点击事件
        downloadButtonPayments.addTarget(self, action: #selector(downloadButtonTapped), for: .touchUpInside)
    }
    
    @objc private func downloadButtonTapped() {
        downloadTapAction?()
    }

    func localizePaymentsModel() {
        let defaults = UserDefaults.standard
        let lang = defaults.string(forKey: changeLanguageKey.DefaultsKeys.keyOne)
        downloadButtonPayments.setTitle(NSLocalizedString("Download", tableName: nil, bundle: changeLanguage.createBundlePath(lang: lang ?? "sq" ), value: "", comment: ""), for: .normal)
    }
}

修改paymentsViewController中的cellForRowAt方法 #

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    guard let cell = tableView.dequeueReusableCell(withIdentifier: "paymentsCell", for: indexPath) as? paymentsModel else {return UITableViewCell()}
    
    let currentInvoice = payments.Result![changeCustomerKey.DefaultsKeys.keyTwo].properties?[0].payments
    guard let currentInvoices = currentInvoice?[indexPath.row] else { return cell }
    
    cell.priceLabelPayments?.text = "€\(currentInvoices.amount ?? 0.00)"
    cell.whenDateLabel?.text = "\(currentInvoices.insertionDate?.convertToDisplayForm() ?? "")"
    cell.fromSubLabel.text = "\(currentInvoices.bank ?? "")"
    
    cell.downloadButtonPayments.layer.cornerRadius = 5
    cell.localizePaymentsModel()
    
    // 绑定点击回调，闭包直接捕获当前行的模型数据
    cell.downloadTapAction = { [weak self] in
        guard let self = self else { return }
        // 替换为你模型中fileID对应的实际字段名
        let targetFileID = currentInvoices.fileID
        // 此处执行下载逻辑，targetFileID就是当前点击单元格对应的正确ID
        print("待下载文件ID：\(targetFileID)")
    }
    
    return cell
}

内容的提问来源于stack exchange，提问作者Lis1