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如何在与 coredata NSManagedObject 映射时编码/解码 swift4 codable 中的 NSOrderedSet 变量？

import CoreData
import Foundation

@objc(TestObject)
public class TestObject:NSManagedObject,Encodable
{

@nonobjc public class func fetchRequest() -> NSFetchRequest<TestObject> {
    return NSFetchRequest<TestObject>(entityName: "TestObject")
}


@NSManaged public var testName: String?
@NSManaged public var devices: NSOrderedSet?  // of entity type "Device"

enum CodingKeys: String, CodingKey {
    case testName
    case devices

}
public func encode(to encoder: Encoder) throws {
     var container = encoder.container(keyedBy:CodingKeys.self)
    try container.encode(testName,forKey:.testName)
    try container.encode(devices,forKey:.devices)
}
}

public required convenience init(from decoder: Decoder) throws { …

UICollectionView 中的水平滚动仅返回一行，我需要制作一个包含 2 行的水平滚动集合视图，如下图所示

[1]：https://i.stack.imgur.com/Vs1kt.png：[1]