首次加载iOS核心数据数据库失败

在我的iOS应用程序中,我的数据库位于 Application support/myDatabase 文件夹Hare是用于创建此文件夹(如果不存在)的代码:

class MyDatabaseURLHelper {
  private databaseBase: URL {
    let baseDir: FileManager.SearchPathDirectory = 
      .applicationSupportDirectory
    let subDir = "myDatabase"
    var url = FileManager.default.urls(
      for: baseDir,
      in: .userDomainMask).first!.appendPathComponent(subDir)
    return url
  }

  func databaseURL() -> URL? {
    var url: URL? = databaseBase
    let dbName = "MyDatabaseFile"
    if !FileManager.default.fileExists(atPath: url.path) { 
      do {
        try FileManager.default.createDirectory(
          atPath: databaseBase.path, 
          withIntermediateDirectories: true, 
          attributes: nil)
      } catch {
        url = nil
    }
    return url?.appendPathComponent(dbName)
  }
}

我已经测试了以上代码。如果数据库子文件夹不存在(第一次),则会创建该数据库子文件夹,并且数据库url看起来很好。

以下是我加载数据库的代码片段:

let modelName = "MyDatabase"
let container = NSPersistentContainer(name: modelName)
let url = MyDatabaseURLHelper().databaseURL()!
let storeDesription = NSPersistentStoreDescription(url: url)
storeDesription.shouldInferMappingModelAutomatically = true
storeDesription.shouldMigrateStoreAutomatically = true
container.persistentStoreDescriptions = [storeDesription]
container.loadPersistentStores() {
  (storeDescription, error) in
    if let error = error as NSError? {
      let msg = "Unresolved error \(error), \(error.userInfo)"
      fatalError(msg) // <- I got exception here! if database file does not exist first time.
    }
}
return container // No errors if database exists

我的应用程序对现有用户运行正常,因为他们有数据库文件。然而,对于新用户来说,我的应用程序崩溃了。新用户在第一次运行时没有数据库。我在Xcode模拟器中验证了相同的结果。

以下是错误消息:

*"Unresolved error Error Domain=NSCocoaErrorDomain Code=256 \"The file “MyDatabase” couldn’t be opened.\" UserInfo={NSFilePath=/Users/.../Application/8DBC6D4F-967C-433D-9B28-60451CDAECDB/Library/Application Support/myDatabase, \"NSSQLiteErrorDomain\": 14]"*   

不确定最近的iOS(15.4)中发生了什么变化。加载持久性存储缺少什么?