在我的数组数组中删除一个条目时，程序在 swift 中崩溃

Question

我有一个程序可以 sorts/displays 不同类别的表情符号。该程序有一个编辑按钮，用户可以在其中删除或移动“条目”，然后当他们单击“完成”时，程序会重新调整。数组应该更新，每个部分底部的运行总数也应该更新。

我不确定问题出在哪里。错误信息是：

"由于未捕获的异常 'NSInternalInconsistencyException'，正在终止应用程序，原因：'无效更新：无效的部分数。更新 (3) 后 table 视图中包含的部分数必须是等于更新前 table 视图中包含的节数 (4)，加上或减去插入或删除的节数（插入 0 个，删除 0 个）。

当前代码：

 import UIKit

class EmojiTableViewController: UITableViewController {

    var emojis: [[Emoji]] = [
            
            [Emoji(symbol: "", name: "Grinning Face", description: "A typical smiley face.", usage: "happiness"),
            Emoji(symbol: "", name: "Confused Face", description: "A confused, puzzled face.", usage: "unsure what to think; displeasure"),
            Emoji(symbol: "", name: "Heart Eyes", description: "A smiley face with hearts for eyes.", usage: "love of something; attractive"),
            Emoji(symbol: "", name: "Police Officer", description: "A police officer wearing a blue cap with a gold badge. He is smiling, and eager to help.", usage: "person of authority")],
            
            
            [Emoji(symbol: "", name: "Turtle", description: "A cute turtle.", usage: "Something slow"),
            Emoji(symbol: "", name: "Elephant", description: "A gray elephant.", usage: "good memory")],
            
            
            [Emoji(symbol: "", name: "Spaghetti", description: "A plate of spaghetti.", usage: "spaghetti")],
             
             
            [Emoji(symbol: "", name: "Die", description: "A single die.", usage: "taking a risk, chance; game"),
            Emoji(symbol: "⛺️", name: "Tent", description: "A small tent.", usage: "camping"),
            Emoji(symbol: "", name: "Stack of Books", description: "Three colored books stacked on each other.", usage: "homework, studying"),
            Emoji(symbol: "", name: "Broken Heart", description: "A red, broken heart.", usage: "extreme sadness"),
            Emoji(symbol: "", name: "Snore", description: "Three blue \'z\'s.", usage: "tired, sleepiness"),
            Emoji(symbol: "", name: "Checkered Flag", description: "A black and white checkered flag.", usage: "completion")]
        ]
    
    let myTitles: [String] = ["PEOPLE", "ANIMALS", "FOOD", "OTHER"]
    
    override func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
            let headerView = UIView.init(frame: CGRect.init(x: 0, y: 0, width: tableView.frame.width, height: 50))
            
            let label = UILabel()
            label.frame = CGRect.init(x: 5, y: 5, width: headerView.frame.width-10, height: headerView.frame.height-10)
            label.text = myTitles[section]
            label.font = .systemFont(ofSize: 14)
            label.textColor = .gray
            headerView.addSubview(label)
            
            return headerView
        }
        
    override func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
            return 40
        }
    
    override func tableView(_ tableView: UITableView, viewForFooterInSection section: Int) -> UIView? {
            let headerView = UIView.init(frame: CGRect.init(x: 0, y: 0, width: tableView.frame.width, height: 50))
            
            let label = UILabel()
            label.frame = CGRect.init(x: 5, y: 5, width: headerView.frame.width-10, height: headerView.frame.height-10)
            label.text = ("Total Emojis: \(emojis[section].count)")
            label.font = .systemFont(ofSize: 12)
            label.textColor = .gray
            headerView.addSubview(label)
            
            return headerView
        }
        
    override func tableView(_ tableView: UITableView, heightForFooterInSection section: Int) -> CGFloat {
            return 40
        }
    
    override func viewDidLoad() {
        super.viewDidLoad()

        // Uncomment the following line to preserve selection between presentations
        // self.clearsSelectionOnViewWillAppear = false

        // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
        self.navigationItem.rightBarButtonItem = self.editButtonItem
    }

    @IBAction func refreshData(_ sender: UIRefreshControl) {
        tableView.reloadData()
        sender.endRefreshing()
    }

    // MARK: - Table view data source

    override func numberOfSections(in tableView: UITableView) -> Int {
        return emojis.count
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return emojis[section].count

    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
            let cell = tableView.dequeueReusableCell(withIdentifier: "emojiCell", for: indexPath)

            let emoji = emojis[indexPath.section][indexPath.row]
            cell.textLabel?.text = "\(emoji.symbol) - \(emoji.name)"
            cell.detailTextLabel?.text = emoji.description

            return cell
        }
    
    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        print("You clicked at \(indexPath)")
    }
    
    override func tableView(_ tableView: UITableView, accessoryButtonTappedForRowWith indexPath: IndexPath) {
        print("You clicked emoji \(emojis[indexPath.row])")
    }


    /*
    // Override to support conditional editing of the table view.
    override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
        // Return false if you do not want the specified item to be editable.
        return true
    }
    */

    // Override to support editing the table view.
    override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
        if editingStyle == .delete {
            // Delete the row from the data source
            emojis.remove(at: indexPath.row)
            tableView.deleteRows(at: [indexPath], with: .fade)
        }
    }

    // Override to support rearranging the table view.
    override func tableView(_ tableView: UITableView, moveRowAt fromIndexPath: IndexPath, to: IndexPath) {
        let movingEmoji = emojis.remove(at: fromIndexPath.row)
        emojis.insert(movingEmoji, at: to.row)
    }

    /*
    // Override to support conditional rearranging of the table view.
    override func tableView(_ tableView: UITableView, canMoveRowAt indexPath: IndexPath) -> Bool {
        // Return false if you do not want the item to be re-orderable.
        return true
    }
    */

    
    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        // Get the new view controller using segue.destination.
        // Pass the selected object to the new view controller.
        if let vc = segue.destination as? EmojiDetailViewController {
            if let indexPath = tableView.indexPathForSelectedRow {
                vc.emoji = emojis[indexPath.section][indexPath.row]
            }
        }
    }
    

}

Answer 1

在这里您删除了整个部分，但只删除了 1 行来刷新 table，因此替换

// Override to support editing the table view.
override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
    if editingStyle == .delete {
        // Delete the row from the data source
        emojis.remove(at: indexPath.row)
        tableView.deleteRows(at: [indexPath], with: .fade)
    }
}

有

// Override to support editing the table view.
override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
    if editingStyle == .delete {
        // Delete the row from the data source
        emojis[indexPath.section].remove(at: indexPath.row)
        tableView.deleteRows(at: [indexPath], with: .fade)
    }
}

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