如何使用 Swift 中的按钮从数组更新 tableView 中的单元格？

Question

So, I was trying to make Birthday App which notes name and birthday of the written textField values. When i press button, those values are saved in two separated Arrays. Those names will be seen on the tableView. I can't see nameArray values on cells but the program builds successfully.

My question is how can update tableView cell names with the values of my nameArray?

Thanks in advance

import UIKit

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate{
    
    @IBOutlet weak var nameTF: UITextField!
    @IBOutlet weak var birthdayTF: UITextField!
    @IBOutlet weak var firstTV: UITableView!
    
    var nameArray = [String]()
    var birthdayArray = [String]()
    
    let rowName = UITableViewCell()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        
        firstTV.delegate = self
        firstTV.dataSource = self
    }

    @IBAction func saveButton(_ sender: Any) {
       
        nameArray.append(nameTF.text!)
        birthdayArray.append(birthdayTF.text!)
        
    }

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

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
       
        rowName.textLabel?.text = nameArray[indexPath.row]
        return rowName
    }
}

Answer 1

You need to go through a few tutorials on using table views and reusable table view cells.

I'm going to assume that, in Storyboard, you added a cell to the table view and set its Style to Basic. You need to give that prototype cell an Identifier -- such as "cell":

Then, in your cellForRowAt function, dequeue a reusable instance of that cell.

Here's your modified code:

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate{
    
    @IBOutlet weak var nameTF: UITextField!
    @IBOutlet weak var birthdayTF: UITextField!
    @IBOutlet weak var firstTV: UITableView!
    
    var nameArray = [String]()
    var birthdayArray = [String]()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        
        firstTV.delegate = self
        firstTV.dataSource = self
    }
    
    @IBAction func saveButton(_ sender: Any) {
        
        nameArray.append(nameTF.text!)
        birthdayArray.append(birthdayTF.text!)
        
        firstTV.reloadData()
    }
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return nameArray.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
        cell.textLabel?.text = nameArray[indexPath.row]
        return cell
    }
}