ios - 以单一名称将多个对象保存到核心数据

Question

我正在使用 swift 3.0 开发一个项目，其中我有一个带有多个选择选项的 UITableView(每行都有一个 URL)。因此，在 UITableView 之上，使用可以在 UITextfield 中输入名称。我的要求是，一旦选择了这些行，数据就应该以键入的名称保存在 Coredata 中。截至目前，数据已保存为单独的元素，因此我无法以其名称对数据进行聚类。我怎么能做到这一点？？。我保存和提取数据的方法如下。

保存

public static func savePlaylistDetails(audio:AudioDetails, playListName: String) {

    let appDelegate = UIApplication.shared.delegate as! AppDelegate
    let context = appDelegate.persistentContainer.viewContext

    let newPlaylist = NSEntityDescription.insertNewObject(forEntityName: PlayList_DETAILS_ENTITY, into: context)


    newPlaylist.setValue(playListName, forKey:"playlistName");
    newPlaylist.setValue(audio.mediaId, forKey:"trackID");

    do{
        try context.save();
        print("Saved.....")
    }
    catch{
        print("There was an error")
    }
}

获取保存的数据

    public static func getPlayList() -> [PlayListDetails]?{
    let appDelegate = UIApplication.shared.delegate as! AppDelegate;
    let context = appDelegate.persistentContainer.viewContext;

    let request = NSFetchRequest<NSFetchRequestResult>(entityName: PlayList_DETAILS_ENTITY)
    request.returnsObjectsAsFaults = false

    do{
        let results = try context.fetch(request)
        if(results.count > 0 ){
            for result in results as! [NSManagedObject]{
                let playListDetails:PlayListDetails? = result as? PlayListDetails
                print("Title: \(playListDetails?.playlistName)")


            }
            return results as? [PlayListDetails]
        }else{
            print("No results")
        }

    }catch{
        print("Error in fetching items")
    }
    return nil;
}

Answer 1

创建一个字典并使用适当的键将所有字段保存在字典中。然后将dict转成data保存在coreData中保存..

let data = NSKeyedArchiver.archivedData(withRootObject: dictionary)
 let appDelegate = UIApplication.shared.delegate as! AppDelegate
    let context = appDelegate.persistentContainer.viewContext

    let newPlaylist = NSEntityDescription.insertNewObject(forEntityName: PlayList_DETAILS_ENTITY, into: context)


    newPlaylist.setValue(data , forKey:"playlistData");

检索

先从CoreData中获取数据，然后再转换成Dictionary。

let unarchivedDictionary = NSKeyedUnarchiver.unarchiveObject(with: data)