核心数据中的可转换属性无法导出/与 iCloud 同步

我在用NSPersistentCloudKitContainer。 所有数据均在 iCloud 中同步。卸载应用程序后，它会正确同步。

但是，需要对敏感数据进行加密。我将密码属性设置为可转换。因此在本地工作得很好。但是当我删除该应用程序时。再次安装。所有其他属性（字符串、整数）正确同步，但可转换属性未导出/同步。

Here is my Model

public class EmployeeEntity: NSManagedObject {

    @NSManaged public var password: NSObject?

    @NSManaged public var firstName: String?
    @NSManaged public var lastName: String?
    @NSManaged public var idNumber: String?
    @NSManaged public var modifiedDate: Date?
    @NSManaged public var password: String?
    @NSManaged public var title: String?

    static var entityName: String { return "EmployeeEntity" }
}


extension EmployeeEntity {

    static func getListItemFetchRequest() -> NSFetchRequest<EmployeeEntity>{
        let request = EmployeeEntity.fetchRequest() as! NSFetchRequest<EmployeeEntity>
        request.sortDescriptors = [NSSortDescriptor(key: "createdDate", ascending: false)]
        return request
    }
}

import UIKit

class EncryptionTransformer: ValueTransformer {

    override class func allowsReverseTransformation() -> Bool{
        return true
    }
    override class func transformedValueClass() -> AnyClass {
        return NSData.self
    }
    override func transformedValue(_ value: Any?) -> Any?{
        guard let date = value as? String else {return nil}

        return date.data(using: .utf8)?.base64EncodedData()
    }

    override func reverseTransformedValue(_ value: Any?) -> Any?{
        guard let data = value as? String, let decoded = Data(base64Encoded: data) else {return nil}

        return String(data: decoded, encoding: .utf8)
    }
}

您知道为什么 Transformable 值没有从 iCloud 保存/同步吗？