如何与自定义 UITableViewCell class 交互？

Question

我使用自定义 UITableViewCell class 创建了 table 视图。因此，当点击导航栏中的按钮时，我的应用程序应该将 UIStepper 设置为隐藏。比它应该按 Stepper 的值更新计数标签我的应用程序的使命是查看您家中的药品数量和清单。因此，当点击该行的步进器时更新每个医疗人员的计数。

import UIKit
class MedicinesListPage: UIViewController, UITableViewDelegate, UITableViewDataSource {
    
    @IBOutlet weak var tableView: UITableView!
    
    struct Medicine {
        var name: String
        var count: Int
    }
    var medicines = [
        Medicine(name: "Парацетамол", count: 1),
        Medicine(name: "Ибуфен", count: 2),
        Medicine(name: "Цитрамон", count: 1),
        Medicine(name: "Смекта", count: 1),
        Medicine(name: "Мезин", count: 1),
        Medicine(name: "Терафлю", count: 1),
        Medicine(name: "Спирт", count: 1),
        Medicine(name: "Бинт", count: 1),
        Medicine(name: "Мукалтин", count: 1),
        Medicine(name: "Стрепсилс", count: 1)
    ]
    
    
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let rightButton = UIBarButtonItem(title: "Add", style: UIBarButtonItem.Style.plain, target: self, action:(#selector(showEditing)))
        
        navigationItem.rightBarButtonItem = rightButton
        
        tableView.delegate = self
        tableView.dataSource = self
        
    }
    @objc func showEditing(){
        
// should unhide stepper 
    }
    
    
    


    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        tableView.deselectRow(at: indexPath, animated: true)
        
    }
    func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        return 65
    }
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return medicines.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell =  tableView.dequeueReusableCell(withIdentifier: "medicalTableViewCell") as? medicalTableViewCell
        cell?.configureCell(name: medicines[indexPath.row].name, count: medicines[indexPath.row].count)
        return cell!
    }
}

UITableViewCell class

import UIKit

final class medicalTableViewCell: UITableViewCell{
    
 
    
    @IBOutlet weak var medicalName: UILabel!
    @IBOutlet weak var medicalCount: UILabel!
    @IBOutlet weak var stepper: UIStepper!
    
    override func awakeFromNib() {
        super.awakeFromNib()
        
        
    }
    
    
    @IBAction func stepperTapped(_ sender: UIStepper) {
        // should update count of medicals
    }
    
    
    public func configureCell(name: String, count: Int){
        
        medicalName.text = name
        medicalCount.text = String(count)
        
        
    }
    
}

Answer 1

var medicalNames: [String] = ["item 1", "item 2", "item 3"]
var medicalCount: [Int] = [5,2,7]

这是糟糕的设计 - 将其改为结构数组：

struct Medicine { 
   let name: String
   var count: Int
}

let medicines = [
   Medicine(name: "foo", count: 1), Medicine(name: "bar", count: 2)
]

完成后，您可以轻松添加一个 Bool 标志，例如 stepperHidden，它控制步进器是否在您的 configureCell 方法中可见。如果您希望隐藏所有步进器，请将所有标志设置为 true 并调用 tableView.reloadData()

您的 tableView 方法如下所示：

 func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell =  tableView.dequeueReusableCell(withIdentifier: "medicalTableViewCell") as! medicalTableViewCell
    let medicine = medicines[indexPath.row]
    cell?.configureCell(with: medicine)
    return cell
}

相应地，

public func configureCell(_ medicine: Medicine){
    medicalName.text = medicine.name
    medicalCount.text = "\(medicine.count)"
    // stepper.isHidden = medicine.stepperHidden
}

Answer 2

据我了解，您有一个 TableViewController 带有海关 UITableView 单元格。每个单元格都包含药物名称、编号和 UIStepper（允许更改该药物的编号）。您的目标是在每次点击 UIStepper 时更新 medicalCountLabel。

（从评论里的对话来看，我是这么实现的）

自定义 UITableViewCell Class

import UIKit

class TableViewCell: UITableViewCell {
    //MARK: - Properties
    @IBOutlet weak var nameLabel: UILabel!
    @IBOutlet weak var countLabel: UILabel!
    @IBOutlet weak var stepper: UIStepper!
    
    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
    }

    override func setSelected(_ selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)

        // Configure the view for the selected state
    }
    
    //MARK: - Actions
    
    @IBAction func stepperTapped(_ sender: UIStepper) {
        countLabel.text = Int(sender.value).description
    } //this is where you update `medicalCountLabel`
    
}

TableViewController Class:

import UIKit

class TableViewController: UITableViewController {
    //MARK: - Properties
    var medicines = [Medicine(name: "Парацетамол", count: 4), Medicine(name: "Ибуфен", count: 7),Medicine(name: "Цитрамон", count: 4),Medicine(name: "Смекта", count: 9), Medicine(name: "Мезин", count: 2)]

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

    // MARK: - Table view data source

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

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

    
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        guard let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as? TableViewCell else{
            fatalError("The dequeued cell is not an instance of TableViewCell.")
        }

        // Configure the cell
        let medicine = medicines[indexPath.row]
        cell.nameLabel.text = medicine.name
        cell.countLabel.text = String(medicine.count)
        cell.stepper.value = Double(medicine.count)
        return cell
    }
}

Medicine Class（在你的情况下，你只是使用 struct 完成它，这也很好；但我创建了一个单独的 swift 文件）：

import UIKit
class Medicine{
    var name: String
    var count: Int
    
    init(name: String, count: Int){
        self.name = name
        self.count = count
    }
}

如何与自定义 UITableViewCell class 交互？

How to interact with custom UITableViewCell class?

uitableview

ios

swift