如何根据 uitableview 行选择更改导航栏标题？

Question

我在我的视图控制器上添加了一个导航栏。但是当我运行我的代码时，这一行： let cell = sender as! UITableViewCell 有问题。知道如何根据我的选择添加或更改导航栏标题吗？我的 UITableView 是一个数组列表。虽然构建成功，但它一直显示

Thread 1: signal SIGABRT

除此之外，如何根据我在 UITableView 中的选择更改导航栏标题？

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

    if segue.destination is DetailVC {

        let destination = segue.destination as! DetailVC
        let cell = sender as! UITableViewCell
        destination.navigationItem.title = cell.textLabel?.text

        destination.developer = developerArray[(myTableView.indexPathForSelectedRow?.row)!]
        myTableView.deselectRow(at: myTableView.indexPathForSelectedRow!, animated: true)
    }
}

查看控制器代码

import UIKit


class Developers {
    var developerName: String?
    var developerEmail: String?
    var developerBalance: Float?
    var developerHP: String?

    init(dvName: String, dvHP: String) {
        self.developerName = dvName
        self.developerHP = dvHP
    }
}

class ViewController: UIViewController, UITableViewDelegate,  UITableViewDataSource {

    @IBOutlet weak var myTableView: UITableView!

   var developerArray = [Developers]()

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.

        //navigationItem.searchController = UISearchController(searchResultsController: nil)


        let developer = Developers(dvName: "Developer 0", dvHP: "Phone Number: #0")
        developerArray.append(developer)

        let developer1 = Developers(dvName: "Developer 1", dvHP: "Phone Number: #1")
        developerArray.append(developer1)

        let developer2 = Developers(dvName: "Developer 2", dvHP: "Phone Number: #2")
        developerArray.append(developer2)

        let developer3 = Developers(dvName: "Developer 3", dvHP: "Phone Number: #3")
        developerArray.append(developer3)

        let developer4 = Developers(dvName: "Developer 4", dvHP: "Phone Number: #4")
        developerArray.append(developer4)

        let developer5 = Developers(dvName: "Developer 5", dvHP: "Phone Number: #5")
        developerArray.append(developer5)

        let developer6 = Developers(dvName: "Developer 6", dvHP: "Phone Number: #6")
        developerArray.append(developer6)

        myTableView.dataSource = self
        myTableView.delegate = self

    }

    //MARK:- UITableView methods

    func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }

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

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        var cell = tableView.dequeueReusableCell(withIdentifier: "MyCell")
        if cell == nil {

            cell = UITableViewCell(style: .subtitle, reuseIdentifier: "MyCell")
        }

            cell?.textLabel?.text = developerArray[indexPath.row].developerName
            cell?.detailTextLabel?.text = developerArray[indexPath.row].developerHP

            return cell!
    }

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

        let detailVC = DetailVC()
        detailVC.titleStringViaSegue = self.developerArray[indexPath.row].developerName
        self.navigationController?.pushViewController(detailVC, animated: true)

        performSegue(withIdentifier: "DevToDetail", sender: self)
    }

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if let destination = segue.destination as? DetailVC {
            destination.developer = developerArray[(myTableView.indexPathForSelectedRow?.row)!]
            myTableView.deselectRow(at: myTableView.indexPathForSelectedRow!, animated: true)
        }
    }
}

Answer 1

在目标控制器上创建 navigationTitle 属性。

 class Destination: UIViewController {
        var navigationTitle  = ""

        override func viewDidLoad() {
            super.viewDidLoad()
            self.navigationItem.title =  navigationTitle

       }

    }

在推送目标控制器时检查标题是否可用

if segue.destination is DetailVC {

            let destination = segue.destination as! DetailVC

            if let cell = sender as? UITableViewCell , let title = cell.textLabel?.text {
                destination.navigationTitle = title
            }


            destination.developer = developerArray[(myTableView.indexPathForSelectedRow?.row)!]
            myTableView.deselectRow(at: myTableView.indexPathForSelectedRow!, animated: true)
        }

Answer 2

这是您的 DetailVC

class DetailVC: UIViewController {
    @IBOutlet weak var productLabel: UILabel!
    var titleStringViaSegue: String!

    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.backgroundColor = .white
        self.title = self.titleStringViaSegue
    }
}

像这样更改您的 didselect 方法。

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        let destination = storyboard.instantiateViewController(identifier: "DetailVC") as! DetailVC
        destination.titleStringViaSegue = developerArray[indexPath.row].name
        self.navigationController?.pushViewController(destination, animated: true)
}

您可以像这样提供故事板 ID。

Answer 3

使用tableView的didSelect功能：

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let destination = storyboard.instantiateViewController(identifier: "<StoryboardID>") as! Destination //StoryboardID of Destination
    destination.navigationTitle = developerArray[indexPath.row]
    self.navigationController?.pushViewController(vc, animated: true)
}

如何根据 uitableview 行选择更改导航栏标题？

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