Question

我正在尝试加载预先填充的领域数据库：

数据库看起来像这样： Image Link

我将文件拖到Xcode管理中，如下所示： Message Link

然后我的项目树看起来像这样：Project Tree Link

在Swift中，AppDelegate中的以下代码用于迁移

import UIKit
import RealmSwift

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

var window: UIWindow?


func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {


    let defaultPath = Realm.Configuration.defaultConfiguration.fileURL

    let oldPath = Bundle.main.url(forResource: "person", withExtension: "realm")

    if let bundlePath = oldPath {
        do {
            try? FileManager.default.removeItem(at: defaultPath!)
            try FileManager.default.copyItem(at: bundlePath, to: defaultPath!)
        } catch {
            print(error)
        }
    }

    let config = Realm.Configuration(
        schemaVersion: 2,
        migrationBlock: { migration, oldSchemaVersion in

            if oldSchemaVersion < 1 {
                migration.enumerateObjects(ofType: Book1.className(), { (oldObject, newObject) in
                    let answer = oldObject!["answer"] as! String?
                    let name = oldObject!["name"] as! String?

                    newObject?["answer"] = answer
                    newObject?["name"] = name


                })

            }
    }, deleteRealmIfMigrationNeeded: false, objectTypes: [Book1.self])

    Realm.Configuration.defaultConfiguration = config

    // Override point for customization after application launch.
    return true
}

这是Book1课程：

import Foundation
import RealmSwift

class Book1: Object {

    @objc dynamic var name: String? = nil
    @objc dynamic var answer: String? = nil

}

这是ViewController中包含表格的代码：

import UIKit
import RealmSwift

class ViewController: UIViewController {

@IBOutlet weak var myTable: UITableView!

let cellID = "cell"

var realm: Realm!

var output : Results<Book1> {
    return realm.objects(Book1.self)
}

override func viewDidLoad() {
    super.viewDidLoad()
    realm = try! Realm()

}

}

// MARK: Table

extension ViewController: UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return output.count
}

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

    cell.textLabel?.text = output[indexPath.row].name

    return cell
}
}

当我运行应用程序时，出现以下错误

线程1：致命错误：'试试！'表达式意外地引发了错误：错误Domain = io.realm Code = 1“Property'Book1.name'不存在”UserInfo = {NSLocalizedDescription = Property'Book1.name'不存在，错误代码= 1}

知道为什么吗？我检查了应用程序复制的默认数据库，它是正确的数据库。

领域代码1错误

0 个答案: