将数据从表格单元格发送到视图控制器时委托属性为零

如何解决将数据从表格单元格发送到视图控制器时委托属性为零

我的委托模式有问题，我试图将数据从表视图单元格发送到另一个视图控制器，但是当我在第二个控制器（接收器）中设置委托属性时，它为零，谁能向我解释一下，我是新手

协议和发送者类：

import UIKit

protocol SendDataDelegate {
    func updateProperties(_ data: CellData)
}

class ViewController: UIViewController {
        
    @IBOutlet weak var tableView: UITableView!
        
    var arr: [CellData] = [
        CellData(img: UIImage(named: "1")!,str1: "welcome1",str2: "hello1"),CellData(img: UIImage(named: "2")!,str1: "welcome2",str2: "hello2"),CellData(img: UIImage(named: "3")!,str1: "welcome3",str2: "hello3"),CellData(img: UIImage(named: "4")!,str1: "welcome4",str2: "hello4"),CellData(img: UIImage(named: "5")!,str1: "welcome5",str2: "hello5"),CellData(img: UIImage(named: "6")!,str1: "welcome6",str2: "hello6"),CellData(img: UIImage(named: "7")!,str1: "welcome7",str2: "hello7"),CellData(img: UIImage(named: "8")!,str1: "welcome8",str2: "hello8"),CellData(img: UIImage(named: "9")!,str1: "welcome9",str2: "hello9"),CellData(img: UIImage(named: "10")!,str1: "welcome10",str2: "hello10")
    ]
    
    var delegate: SendDataDelegate?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        setupTableView()
    }
        
    fileprivate func setupTableView() {
        tableView.dataSource = self
        tableView.delegate   = self
        tableView.register(
            UINib(nibName: Constants.cellNibName,bundle: nil),forCellReuseIdentifier: Constants.cellIdentifier
        )
    }
}

extension ViewController: UITableViewDataSource {
    
    func tableView(_ tableView: UITableView,numberOfRowsInSection section: Int) -> Int {
        return arr.count
    }
    
    func tableView(_ tableView: UITableView,cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(
            withIdentifier: Constants.cellIdentifier,for: indexPath
        ) as! TableCell
        cell.picture.image = arr[indexPath.row].img
        cell.label1.text   = arr[indexPath.row].str1
        cell.label2.text   = arr[indexPath.row].str2
        return cell
    }
    
    func tableView(_ tableView: UITableView,heightForRowAt indexPath: IndexPath) -> CGFloat {
        return CGFloat(300.0)
    }
}

extension ViewController: UITableViewDelegate {
    
    func tableView(_ tableView: UITableView,didSelectRowAt indexPath: IndexPath) {
        tableView.deselectRow(at: indexPath,animated: true)
        
        let storyboard = UIStoryboard(name: Constants.storyboardName,bundle: nil)
        let nextController = storyboard.instantiateViewController(
            withIdentifier: Constants.destinationController
        ) as! SecondController
        
        var data = arr[indexPath.row]
        delegate?.updateProperties(data)
        present(nextController,animated: true,completion: nil)
    }
    
}

这里是接收器类：

import UIKit

class SecondController: UIViewController {
        
    @IBOutlet weak var picture: UIImageView! {
        didSet {
            picture.image = img
        }
    }
    @IBOutlet weak var label11: UILabel! {
        didSet {
            label11.text = s1
        }
    }
    @IBOutlet weak var label22: UILabel! {
        didSet {
            label22.text = s2
        }
    }

    var s1 = ""
    var s2 = ""
    var img = UIImage()
        
    override func viewDidLoad() {
        super.viewDidLoad()
    
        view.backgroundColor = .systemRed
        
        let controller = UIStoryboard(name: Constants.storyboardName,bundle: nil).instantiateViewController(
        withIdentifier: Constants.firstController
        ) as! ViewController
        controller.delegate = self
        print(s1)
    }
    
}

extension SecondController: SendDataDelegate {
    
    func updateProperties(_ data: CellData) {
        self.s1 = data.str1
        self.s2 = data.str2
        self.img = data.img
    }
    
}

解决方法

这里不需要委托，只需要传递模型项

        stage('Static Analysis') {
            steps {
                script{
                    bat'call  "C:\\Program Files\\Cppcheck\\cppcheck.exe" D:\\Source\\Game  --xml --xml-version=2 . 2> cppcheck.xml'
                }
            }
        }

里面nextController.sendedItem = arr[indexPath.row]

SecondController 

里面的var sendedItem:CellData? 设置值

编辑：

viewDidLoad

,

好的，我想通了，在这个函数的发送者类中：

extension ViewController: UITableViewDelegate {
    
    func tableView(_ tableView: UITableView,didSelectRowAt indexPath: IndexPath) {
        tableView.deselectRow(at: indexPath,animated: true)
        
        let storyboard = UIStoryboard(name: Constants.storyboardName,bundle: nil)
        let nextController = storyboard.instantiateViewController(
            withIdentifier: Constants.destinationController
        ) as! SecondController
        
        var data = arr[indexPath.row]
        delegate?.updateProperties(data)
        present(nextController,animated: true,completion: nil)
    }
    
}

我在将数据传递给 updateProperties() 函数之前添加了这一行 delegate = nextController 并且有效