我正在尝试制作表格，但我不断收到错误

Question

我尝试了很多方法来修复这个错误。我对 IOS 编程比较陌生。

这是我不断收到的错误

（无效更新：无效的节数。更新后表视图中包含的节数（1）必须等于更新前表视图中包含的节数（0），加上或减去数字插入或删除的部分（0 插入，0 删除）； 34, 0}; 数据源: >") 代码是做个表格这里就是代码如下

import UIKit

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    var window: UIWindow?
    

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
        // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
        // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
        guard let _ = (scene as? UIWindowScene) else { return }
        
        let itemStore = ItemStore()
        
        let itemController = window!.rootViewController as! ItemsViewController
        
        itemController.itemStore = itemStore
    }

import UIKit

class Item: Equatable {
    var name: String
    var valueInDollars: Int
    var serialNumber: String?
    var dateCreated: Date
    
    init(name: String, serialNumber: String?, valueInDollars: Int) {
        self.name = name
        self.valueInDollars = valueInDollars
        self.serialNumber = serialNumber
        self.dateCreated = Date()
    }
    
    
    convenience init(random: Bool = false) {
        if random {
            let adjectives = ["Fluffy", "Rusty", "Shiny"]
            let nouns = ["Bear", "Spork", "Mac"]
            
            let randomAdjectives = adjectives.randomElement()!
            let randomNoun = nouns.randomElement()!
            
            let randomName = "\(randomAdjectives) \(randomNoun)"
            let randomValue = Int.random(in: 0..<100)
            let randomSerialNumber = UUID().uuidString.components(separatedBy: "-").first!
            
            self.init(name: randomName, serialNumber: randomSerialNumber, valueInDollars: randomValue)
            
        } else {
            self.init(name: "", serialNumber: nil, valueInDollars: 0)
        }
    }
    
    static func ==(lhs: Item, rhs: Item) -> Bool {
        return lhs.name == rhs.name && lhs.serialNumber == rhs.serialNumber && lhs.valueInDollars == rhs.valueInDollars && lhs.dateCreated == rhs.dateCreated
    }
    
}

class ItemStore {
    
    var allItems = [Item]()
    @discardableResult func createItem() -> Item {
        let newItem = Item(random: true)
        
        allItems.append(newItem)
        
        return newItem
    }
    
    func removeItem(_ item: Item) {
        if let index = allItems.firstIndex(of: item) {
            allItems.remove(at: index)
        }
    }
    
    func moveItem (from fromIndex: Int, to toIndex: Int) {
        if fromIndex == toIndex {
            return
        }
        
        let movedItem = allItems[fromIndex]
        
        allItems.remove(at: fromIndex)
        
        allItems.insert(movedItem, at: toIndex)
    }
/*
    init() {
        for _ in 0..<5 {
            createItem()
        }
    }
*/
}


class ItemsViewController: UITableViewController {

    var itemStore: ItemStore!
    
    @IBAction func toggleEditModel(_ sender: UIButton) {
        if isEditing {
            sender.setTitle("Edit", for: .normal)
            
            setEditing(false, animated: true)
        } else {
            sender.setTitle("Done", for: .normal)
            
            setEditing(true, animated: true)
        }
    }
    
    
    
    @IBAction func addNewItem(_ sender: UIButton) {
        
        let newItem = itemStore.createItem()
        
        if let index = itemStore.allItems.firstIndex(of: newItem) {
            let indexPath = IndexPath(row: index, section: 0)
            
            tableView.insertRows(at: [indexPath], with: .automatic)
        }
        
    }
    
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
    }


    override func numberOfSections(in tableView: UITableView) -> Int {
        // #warning Incomplete implementation, return the number of sections
        return itemStore.allItems.count
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return itemStore.allItems.count
    }
    
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        // #warning Incomplete implementation, return the number of rows
        let cell = tableView.dequeueReusableCell(withIdentifier: "UITableViewCell", for: indexPath)
        
        let item = itemStore.allItems[indexPath.row]
        
        cell.textLabel?.text = item.name
        cell.detailTextLabel?.text = "\(item.valueInDollars)"
        
        return cell
    }
    
    override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
        if editingStyle == .delete {
            let item = itemStore.allItems[indexPath.row]
            itemStore.removeItem(item)
            tableView.deleteRows(at: [indexPath], with: .automatic)
        }
    }
    
    override func tableView(_ tableView: UITableView, moveRowAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) {
        itemStore.moveItem(from: sourceIndexPath.row, to: destinationIndexPath.row)
    }

}

表格视图能够管理按部分组织的数据。您可以有任意数量的部分，每个部分可以包含不同数量的项目。 （想象一本按字母表字母组织的百科全书。每个部分都是字母表中的一个字母，并且包含以该字母开头的文章。）

Answer 1

您还可以创建包含单个部分的表格视图。在这种情况下，它只是一个简单的项目列表。

正如 Paulw11 所建议的，您的表格视图看起来包含一个部分。因此，您应该重写 numberOfSections 函数以始终返回 1:

    override func numberOfSections(in tableView: UITableView) -> Int {
        // #warning Incomplete implementation, return the number of sections
        return 1
    }