ios - 更新 : How to checkmark select items from selection List by clicking Tableview cell in swift

Question

我正在尝试从 ViewController 检索 tableView 中的选定项目它有一个来自 sqlite 的列表，如复选标记选择。我的 FirstViewController有 tableView 并在单击选择性单元格时打开 ViewController选择项目。
一旦做出选择，我必须重新加载 FirstViewController TableView 。实际上我正在尝试做但没有准确地做。任何人都请帮我选择项目并在表格 View 中设置。我很困惑，无法通过 segue 进行传递选择。
我的github项目链接如下:

我的项目 : https://github.com/MasamMahmood/SqliteDataList/tree/master/SqliteDataList

引用:https://blog.apoorvmote.com/how-to-pass-selection-via-segue/

更新了一个 FirstViewController:

class FirstViewController: UIViewControlller, ListDelegate {

   var selectedIndex: Int?
   var selectedSection: Int?

   //Click event for navigation from FirstViewController to SecondViewController
   @IBAction func BackButtonAction(_ sender: Any) {
       let vc = self.storyboard?.instantiateViewController(withIdentifier: "SecondViewController") as! SecondViewController
       vc.delegate = self
       self.navigationController?.pushViewController(vc, animated: true)
   }

   func listFunc(listValue: String) {
       AppData?.sectionList?[selectedSection!].items?[selectedIndex!].textField = listValue
       tableView.reloadData()
   }

   func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
       //Add these two line in your code
       selectedIndex = indexPath.row
       selectedSection = indexPath.section
   } 
}

更新了 SecondViewController:

protocol ListDelegate {
    func listFunc(listValue: String)
}

class SecondViewController: UIViewControlller {
    var delegate: ListDelegate?

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        let indexPath = tableView.indexPathForSelectedRow
        let currentCell = tableView.cellForRow(at: indexPath!)!
        //print(currentCell.textLabel?.text as Any)
        currentCell.accessoryType = .checkmark
        delegate?.listFunc(listValue: currentCell.textLabel?.text ?? "")
        self.navigationController?.popViewController(animated: true)
   }
}

Answer 1

您需要一个委托(delegate)来与 FirstViewController 进行通信。你可以这样做...

protocol ViewControllerDelegate: AnyObject {
    func viewControllerDidMakeSelection(at index: Int)
}

class ViewController: UIViewController {

    @IBOutlet weak var tableView: UITableView!

    weak var delegate: ViewControllerDelegate?

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        delegate?.viewControllerDidMakeSelection(at: indexPath.row)
    }
}

class FirstViewController: UIViewController, ViewControllerDelegate {

    @IBOutlet weak var tableView: UITableView!

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        let vc = self.storyboard?.instantiateViewController(withIdentifier: "ViewController") as! ViewController
        vc.delegate = self
        self.navigationController?.pushViewController(vc, animated: true)
    }

    func viewControllerDidMakeSelection(at index: Int) {
        // This is where the magic happens
    }
}