视图控制器不显示来自 TableViewController 的数据

Question

我创建了一个 TableViewController，它从数组中加载单元格的数据。（除加载速度外工作正常，有什么提示吗？）

我的问题是我还创建了一个连接有按钮的视图控制器。我希望按钮根据上一个视图中选择的单元格加载数据。

我在 YouTube 上观看了几个视频，它们都展示了相同的处理方法，但是当我尝试在我的代码中使用这个理论时，它不起作用。

这里是原来的TableViewController代码

//  CatagoryTableViewController.swift

import UIKit

var list = [Categories]()

var myIndex = 0

class CatagoryTableViewController: UITableViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        list.append(Categories(categoryText: "In The Mix", choiceA: "Ivy Smith", choiceB: "Shay West", choiceC: "Donald Allen", choiceD: "Zay (Wooo)"))
        list.append(Categories(categoryText: "Best Male Organization",choiceA: "People Standing United", choiceB: "Young Kings Movement", choiceC: "Gentlemen Qualities", choiceD: "" ))
        list.append(Categories(categoryText: "Best Female Organization", choiceA: "RSVP", choiceB: "STARS", choiceC: "NCNW", choiceD: "BSLS"))
        list.append(Categories(categoryText: "Best Dancer", choiceA: "Ansord Rashied", choiceB: "Donald Allen", choiceC: "Isis Ferguson", choiceD: "Jada Mosoey"))
        list.append(Categories(categoryText: "Most Likely To Brighten Your Day", choiceA: "Bar'rae Choice", choiceB: "Tytiana Jackson", choiceC: "Ivery Tanner", choiceD: "Chinonye Agu"))
        list.append(Categories(categoryText: "Best Modeling Troop", choiceA: "Ziana Fashion Club", choiceB: "We R 1 Family", choiceC: "", choiceD: ""))
        list.append(Categories(categoryText: "Best Male Friend Group", choiceA: "Quincy, Kraig, and Kiefer", choiceB: "WOOO", choiceC: "Kevin, Ivery, Kendell, and Marc", choiceD: "Dre, Eli, Jafari, and Ryan"))
        list.append(Categories(categoryText: "Best Female Friend Group", choiceA: "Omolara, Xela, Reggie, and Shania", choiceB: "Dior, Ashleigh, Tanya, Asha, Jazamine, and Aliea", choiceC: "Damo, Dani, Ty,Tati, and Ivy", choiceD: "Ahmani, Leshay, and Nyia"))
        list.append(Categories(categoryText: "Best Dressed Male", choiceA: "Dane Tyree", choiceB: "Ajamu Davis", choiceC: "Taj Green", choiceD: "Isiah Thomas"))
        list.append(Categories(categoryText: "Best Dressed Female", choiceA: "Imani Stamford", choiceB: "Ivy Smith", choiceC: "Tyler Murray", choiceD: "Kam"))
        list.append(Categories(categoryText: "Best DJ", choiceA: "Dj Topchoice", choiceB: "Dj Mizzy", choiceC: "Dj Che", choiceD: ""))
        list.append(Categories(categoryText: "Best Clothing Line", choiceA: "Visonary Society", choiceB: "Rare World", choiceC: "Handwritten", choiceD: "Soigne Y Pree"))
        list.append(Categories(categoryText: "Best Clothing Line", choiceA: "2016", choiceB: "2015", choiceC: "2014", choiceD: "2013"))
        list.append(Categories(categoryText: "Best Miss Lincoln", choiceA: "2016", choiceB: "2015", choiceC: "2014", choiceD: "2013"))
        list.append(Categories(categoryText: "Best Mr Lincoln", choiceA: "2016", choiceB: "2015", choiceC: "2014", choiceD: "2013"))
    }

    override func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }
    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
      let count = list.count
            return count
        }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "CustomCell", for: indexPath)

     let category = list[indexPath.row]
      cell.textLabel?.text = category.categoryName
        return cell
    }

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

        myIndex = indexPath.row
        performSegue(withIdentifier: "showNominees", sender: self)

    }
}

此处，如果视图控制器应显示基于所选单元格的数据。我没有错误，但当程序为运行.

时按钮仍然显示按钮

//  ViewController.swift
  
import UIKit

class ViewController: UIViewController {
    
    @IBOutlet weak var optionA: UIButton!
    @IBOutlet weak var optionB: UIButton!
    @IBOutlet weak var optionC: UIButton!
    @IBOutlet weak var optionD: UIButton!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        let nominees = list[myIndex]
        print(nominees)
        optionA.titleLabel?.text = nominees.optionA
        optionB.titleLabel?.text = nominees.optionB
        optionC.titleLabel?.text = nominees.optionC
        optionD.titleLabel?.text = nominees.optionD
    }
}
 */

Answer 1

首先在您的 tableViewController 中声明您的列表变量。添加这个：

      self.performSegue(withIdentifier: "showNominees", sender: indexPath)

在 viewDidLoad 方法之外，但在您的第二个 viewController 方法内创建提名变量。使用 prepare for segue 方法：

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
            if segue.identifier == "showNominees" {
               if let vc = segue.destination as? ViewController {
                    guard let indexPath = sender as? IndexPath else { return }
                    vc.nominees = self.list[indexPath.row]
                  }            
            }
        }

大家已经提到你应该使用 setTitle :

self.optionA.setTitle(nominees.choiceA, for: .normal)

它应该可以工作 now.Hopefully。如果有帮助，请告诉我。

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