Ios 是否使用关系类在coredata中保存数据？

我有一个类

Place

&另一个类为

Address

。现在一个地方只有一个地址，因此我必须创建到一个关系。现在，当我尝试保存这个地方时，我无法执行此操作。下面是我为此功能编写的代码

if #available(iOS 10, *) {
            placeInfo =  NSEntityDescription.insertNewObject(forEntityName: "PlaceInfo", into: appDelegate.persistentContainer.viewContext) as? PlaceInfo
        } else {
            placeInfo = NSEntityDescription.insertNewObject(forEntityName: "PlaceInfo", into: appDelegate.managedObjectContext!) as? PlaceInfo
        }
            var cordinates:[String] = []
            placeInfo?.title = Place.shared.title ?? ""
            placeInfo?.desc = Place.shared.desc ?? ""
            placeInfo?.id = "Place_" + String(Utility.shared.currentTimeStamp())
             let spotLocation  = Place.shared.address

            if let lat = spotLocation?.lat, let long  = spotLocation?.long {
                cordinates = [lat.toString(),long.toString()]
            }
            let address  = NSEntityDescription.insertNewObject(forEntityName: "PlaceAddress", into: appDelegate.managedObjectContext!) as? PlaceAddress
            address?.street =  "Street"
            address?.landmark  = "LANDMARK"
            address?.city = "MYCITY"
            address?.state =   "SATTE"
            address?.state =  "INDIA"
            address?.pincode  =  "1256325"

            placeInfo?.isuploaded = true
            if let spotid = placeInfo?.id {
               // saveMediaToDB(id: spotid)
            }
            placeInfo?.address_rel = address

Placeinfo类

import Foundation
import CoreData


extension PlaceInfo {

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

    @NSManaged public var desc: String?
    @NSManaged public var hasmedia: Bool
    @NSManaged public var id: String?
    @NSManaged public var isuploaded: Bool
    @NSManaged public var title: String?
    @NSManaged public var address_rel: PlaceAddress?
    @NSManaged public var files_rel: NSSet?

}

// MARK: Generated accessors for files_rel
extension PlaceInfo {

    @objc(addFiles_relObject:)
    @NSManaged public func addToFiles_rel(_ value: FilesInfo)

    @objc(removeFiles_relObject:)
    @NSManaged public func removeFromFiles_rel(_ value: FilesInfo)

    @objc(addFiles_rel:)
    @NSManaged public func addToFiles_rel(_ values: NSSet)

    @objc(removeFiles_rel:)
    @NSManaged public func removeFromFiles_rel(_ values: NSSet)

}

<代码>导入基础 导入CoreData 分机位置信息{ @nonobjc公共类func fetchRequest（）->NSFetchRequest{ 返回NSFetchRequest（entityName:“PlaceInfo”） } @NSManaged public var desc:字符串？ @NSV管理的公共媒体：Bool @NSManaged公共变量id:String？ @NSManaged公共变量已上载：Bool @NSManaged公共变量标题：字符串？ @NSManaged公共变量地址\u rel:PlaceAddress？ @NSManaged公共var文件\u rel:NSSet？ } //标记：为文件生成的访问器\u rel 分机位置信息{ @objc（addFiles\u relObject:） @NSManaged public func addToFiles\u rel（\u值：FilesInfo） @objc（removeFiles_relObject:） @NSManaged public func removeFromFiles\u rel（\u值：FilesInfo） @objc（addFiles\u rel:） @NSManaged public func addToFiles\u rel（\u值：NSSet） @objc（删除文件） @NSManaged public func removeFromFiles\u rel（\u值：NSSet） }

---

您是否添加了下面的代码行

do {
    try managedObjectContext.save()
} catch {
    fatalError("Failure to save context: \(error)")
}

---

为什么您选择向下播放

as？PlaceInfo

和

作为？地点地址

？这些类肯定是在编译时存在的。强制向下广播不得失败，否则会显示开发人员/设计错误。然后你去掉所有难看的问号。如果可用（iOS 10，*）也应该对

PlaceAddress

初始值设定项进行条件编译。