[我的应用程序在您尝试删除项目时崩溃，并且没有显示所有三个警报字段？

Question

我不知道为什么我的应用崩溃了，我有几个问题

1。为什么当我尝试从tableview删除项目时崩溃，也一旦崩溃，它就会删除它下面的所有单元格

2。我的警报具有3个输入字段，但tableviewcell中仅第一个显示，我希望它显示项目价格和销售价格。当前仅显示项目。

如果有人可以帮助我解决此问题，将不胜感激

import UIKit

let defaults = UserDefaults(suiteName: "com.Saving.Data")

class ViewController: UIViewController {

    @IBOutlet weak var tableView: UITableView!

    var items = [String]()

    override func viewDidLoad() {
        super.viewDidLoad()
        getData()
    }
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(true)
        getData()
    }
    override func viewDidDisappear(_ animated: Bool) {
        super.viewDidDisappear(true)
        storeData()
    }
    override var prefersStatusBarHidden: Bool {
        return true
    }

    @IBAction func addButtonTapped(_ sender: Any) {
        let alert = UIAlertController(title: "Product Information", message: nil, preferredStyle: .alert)
            alert.addTextField { (itemTF) in
                itemTF.placeholder = "Item"
        }
        _ = UIAlertController(title: "", message: nil, preferredStyle: .alert)
            alert.addTextField { (priceTF) in
                priceTF.placeholder = "Price"
        }
        _ = UIAlertController(title: "", message: nil, preferredStyle: .alert)
            alert.addTextField { (saleTF) in
                saleTF.placeholder = "Sale Price"
        }

        let action = UIAlertAction(title: "Add", style: .default) { (_) in
                guard let product = alert.textFields?.first?.text else { return }
                print(product)
                self.add(product)
        }

        alert.addAction(action)
        present(alert, animated: true)
        storeData()

   }

   func add(_ product: String) {
       let index = 0
       items.insert(product, at: index)

       let indexPath = IndexPath(row: index, section: 0)
       tableView.insertRows(at: [indexPath], with: .left)
       storeData()
   }

   func storeData() {
       defaults?.set(items, forKey: "savedData")
       defaults?.synchronize()
   }

   func getData() {
       let data = defaults?.value(forKey: "savedData")
       if data != nil {
           items = data as! [String]
       } else{}
   }
}


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

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

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = UITableViewCell()
        let product = items[indexPath.row]
        cell.textLabel?.text = product

        cell.contentView.backgroundColor = UIColor(red:0.92, green:0.92, blue:0.92, alpha:1.0)
        cell.textLabel?.textColor = UIColor(red:0.13, green:0.13, blue:0.13, alpha:1.0)
        tableView.separatorColor = UIColor(red:0.13, green:0.13, blue:0.13, alpha:1.0)

        return cell
    }

    func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
        guard editingStyle == .delete else { return }
        items.remove(at: indexPath.row)
        storeData()
    }
}

Answer 1

您可以在alertView中添加3个文本字段。

code：

@IBAction func addButtonTapped(_ sender: Any) {
    let alert = UIAlertController(title: "Product Information", message: nil, preferredStyle: .alert)
    alert.addTextField { (itemTF) in
        itemTF.placeholder = "Item"
    }

    alert.addTextField { (textField) in
        textField.placeholder = "Price"
    }

    alert.addTextField { (textField) in
        textField.placeholder = "Sale Price"
    }

    let action = UIAlertAction(title: "Add", style: .default) { (_) in
        guard let product = alert.textFields?.first?.text else { return }
        print(product)
        self.add(product)
    }

    alert.addAction(action)
    present(alert, animated: true)
}