swift - 如何使用操作存储特定单元格的数据？

Question

我有一个ViewController，里面有一个TableView。我还有一个 TableViewCell Controller 。

表格的每个单元格都包含来自 Firebase 的信息和一个按钮。

这里的目标是当我单击按钮时将单元格的信息添加到我的数据库中。

基本上，我有一个歌曲列表，每首歌曲上都有一个添加按钮，我想在单击添加时将一首歌曲添加到我的用户帐户中。

歌曲列表显示得很好，但当我单击“添加”按钮时，我不知道如何将这首歌曲的信息放入我的数据库中。

型号代码:

import Foundation

class ServiceModel {

    var name: String?
    var category: String?
    var pricing: String?

    init(name: String?, category: String?, pricing: String?){
        self.name = name
        self.category = category
        self.pricing = pricing
    }
}

TableViewCell 代码:

class PopularTableViewCell: UITableViewCell {

    @IBOutlet weak var imageService: UIImageView!
    @IBOutlet weak var labelName: UILabel!
    @IBOutlet weak var labelCategory: UILabel!
    @IBOutlet weak var labelPricing: UILabel!

ViewController代码:

import UIKit
import FirebaseDatabase
import FirebaseAuth

class AddSubViewController: UIViewController,UITableViewDelegate,UITableViewDataSource {

    var refServices:DatabaseReference!

    @IBOutlet weak var ListPop: UITableView!

    var serviceList = [ServiceModel]()

    var databaseHandle:DatabaseHandle?

    let userID = Auth.auth().currentUser?.uid


    @IBAction func addSub(_ sender: Any) {

        let ref = Database.database().reference()
            let usersReference = ref.child("users")
            let uid = Auth.auth().currentUser?.uid
            let thisUserReference = usersReference.child(uid!).child("subs").childByAutoId()
        thisUserReference.setValue("test")

**// I want to put the pricing value of the song of my cell instead of "test" in: setValue("test")**

    }

    public func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

        return serviceList.count
    }

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

        let cell = tableView.dequeueReusableCell(withIdentifier: "PopCell", for: indexPath) as! PopularTableViewCell

        let service: ServiceModel

        service = serviceList[indexPath.row]

        cell.imageService?.image = UIImage(named: service.name! + ".png")
        cell.labelName?.text = service.name
        cell.labelCategory?.text = service.category
        cell.labelPricing?.text = service.pricing

        return cell
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        ListPop.delegate = self
        ListPop.dataSource = self

        refServices = Database.database().reference().child("Categories")

        refServices.observe(DataEventType.value, with: { (snapshot) in

            if snapshot.childrenCount > 0 {

                self.serviceList.removeAll()

                for services in snapshot.children.allObjects as! [DataSnapshot] {
                    let serviceObject = services.value as? [String: AnyObject]
                    let serviceName  = serviceObject?["Name"]
                    let serviceCategory  = serviceObject?["Category"]
                    let servicePricing = serviceObject?["Pricing"] as! String + " €"
                    let service = ServiceModel(name: serviceName as! String?, category: serviceCategory as! String?, pricing: servicePricing as String?)

                    self.serviceList.append(service)
                }

                self.ListPop.reloadData()
            }
        })
    }

}

我想将我的单元格中的歌曲的定值(value)而不是“test”放入:setValue(“test”)

Answer 1

如果每个单元格都有按钮，您可以在用户按下按钮后简单地保存模型，因为您有自定义模型(可能只是结构体)，您可以为它以及 TableView 中的每个单元格创建变量 cellForRowAt 数据源方法，您可以分配它

class PopularTableViewCell: UITableViewCell {

    var service: ServiceModel!

    @IBAction func addButtonPressed(_ sender: UIButton) {
        ... // save certain service
    }

}

...

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

    let cell = tableView.dequeueReusableCell(withIdentifier: "PopCell", for: indexPath) as! PopularTableViewCell

    let service = serviceList[indexPath.row]

    cell.service = service // <---

    cell.imageService?.image = UIImage(named: service.name! + ".png")
    cell.labelName?.text = service.name
    cell.labelCategory?.text = service.category
    cell.labelPricing?.text = service.pricing

    return cell
}