以单个名称将多个对象保存到Coredata

Question

我正在研究一个Swift 3.0的项目，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的顶部使用可以在uitextfield中输入名称。我的要求是，一旦选择了这些行，则数据应以键入名称保存在Coredata中。截至目前，数据被保存为单个元素，因此我对以其名称的聚类数据遇到了麻烦。我怎么能实现这一目标？我保存并将数据提取为波纹管的方法。

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，并使用适当的键保存在字典中的所有字段。然后将DICE转换为数据并将其保存在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

首先从Coredata获取数据，然后再次将其转换为字典。

let unarchivedDictionary = NSKeyedUnarchiver.unarchiveObject(with: data)