ios - 无法从 UITableViewCell 获取标签值

Question

我正在尝试将一个值从一个 View Controller 传递到另一个 View Controller 。正如我测试的那样，这没问题并且可以使用我的代码运行。但是当我尝试获取单元格标签值时遇到问题。我尝试了在 google 和 stackoverflow 上找到的所有内容，但没有答案。我在代码上添加了一条注释，上面写着 //I THINK THE PROBLEM IS ON THE NEXT LINE OF CODE 以帮助您找到我卡住的地方。

我的代码:

import UIKit


class PlacesTableViewController: UITableViewController {

@IBOutlet weak var placesTableView: UITableView!

var places = [Places]()
var valueToPass:String!
let cellIdentifier = "PlacesTableViewCell"

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
    {
        // Table view cells are reused and should be dequeued using a cell identifier.


        guard let cell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier, for: indexPath) as? PlacesTableViewCell  else {
            fatalError("The dequeued cell is not an instance of PlacesTableView Cell.")
        }

        let place = places[indexPath.row]

        cell.placeLabel.text = place.name
        cell.ratingControl.rating = place.rating

        return cell

    }

    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath)
    {
        print("You selected cell #\(indexPath.item)!")


        let indexPath = placesTableView.indexPathForSelectedRow

        // I THINK THE PROBLEM IS ON THE NEXT LINE OF CODE
        let currentCell = placesTableView.cellForRow(at: indexPath!)! as UITableViewCell

        print(currentCell.detailTextLabel?.text ?? "Failed to use Cell Label")
        valueToPass = currentCell.detailTextLabel?.text ?? "Failed to use Cell Label"
        performSegue(withIdentifier: "ShowCommentsTableViewController", sender: self)

    }

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if (segue.identifier == "ShowCommentsTableViewController") {
            // initialize new view controller and cast it as your view controller
            let viewController = segue.destination as! CommentsTableViewController
            // will be stored in passedValue on the CommentsTableViewController
            viewController.passedValue = valueToPass
            //print (viewController.passedValue ?? "")
        }
    }

}

Answer 1

为什么不像在 cellForRowAt 中那样只使用数据存储中的原始值？

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

    let place = places[indexPath.row]
    valueToPass = place.name
    performSegue(withIdentifier: "ShowCommentsTableViewController", sender: self)
}