如何使用单独的 UITableViewDataSource class 管理#selector?

How to manage #selector with separate UITableViewDataSource class?

我有一个单独的 class 用于 UITableViewDataSource 我的 UITableView

import UIKit

class CardDataSource: NSObject, UITableViewDataSource {

    //MARK:- Property
    var medialObjects: [MediaCardObject]?
    let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
    var viewController: AddNewVC?

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

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

        let obj = medialObjects![indexPath.row]

        let cell = tableView.dequeueReusableCell(withIdentifier: "MediaTextTableViewCell") as! MediaTextTableViewCell

        cell.btnDelete.tag = indexPath.row
        cell.btnDelete.addTarget(self, action: #selector(AddNewVC.deleteItem(sender:)), for: .touchUpInside)
        cell.tfCardText.text = obj.path
        cell.tfCardText.tag = indexPath.row
        cell.tfCardText.returnKeyType = .done
        cell.tfCardText.delegate = viewController
        cell.selectionStyle = .none
        return cell
    }
}

数据在我的 UITableView 上加载正常,但问题是当我点击删除按钮时它崩溃并显示

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[MediaCards.CardDataSource deleteItemWithSender:]: unrecognized selector sent to instance 0x600003394cc0'

我也试过了

cell.btnDelete.addTarget(self, action: #selector(viewController?.deleteItem(sender:)), for: .touchUpInside)

这里是AddNewVC

中的删除方法
//MARK:- Delete
@objc func deleteItem(sender: UIButton) {

    let selectedIndex = sender.tag
    deleteObjectIndexPath = IndexPath(row: selectedIndex, section: 0)
    confirmDelete()
}

并在 AddNewVC class

var tblDataSource = CardDataSource()

override func viewDidLoad() {
    super.viewDidLoad()

    tblDataSource.viewController = self
    tblMediaCards.dataSource = tblDataSource

    if forEdit {
        let cards = mediaObject?.cards?.allObjects as! [MediaCard]
        for obj in cards {
            let mediaCardObj = MediaCardObject.init(type: obj.type ?? "", path: obj.path ?? "", index: Int(obj.index))
            self.medialObjects.append(mediaCardObj)
        }

        medialObjects = medialObjects.sorted(by: { [=14=].index! < .index! })
        tblDataSource.medialObjects = medialObjects

        self.tblMediaCards.reloadData()
    }
}

但它仍然因同样的原因崩溃。尽管委托工作正常。

目标错误:

cell.btnDelete.addTarget(self, action: #selector(AddNewVC.deleteItem(sender:)), for: .touchUpInside)

方法 AddNewVC.deleteItem(sender:) 不是 self 的一部分,而是另一个 class 成员的一部分。尝试:

cell.btnDelete.addTarget(self.viewController, action: #selector(AddNewVC.deleteItem(sender:)), for: .touchUpInside)

为了安全起见,我宁愿在同一个 viewcontroller 中有一个目标方法,然后让这个调用 datasource/subviewcontroller 方法。