我正在使用swift 3.0中的一個項目,其中有一個帶有多選項(每行有一個URL)的UITableView選項。因此,在TableView之上使用可以在文本字段中輸入名稱。我的要求是,一旦這些行被選中,數據應該以鍵入名稱保存在coredata中。到目前爲止,數據被保存爲獨立的元素,所以我在使用其名稱進行數據聚類時遇到了麻煩。我怎麼能做到這一點?我保存並提取數據的方法如下。如何使用單一名稱將多個對象保存到CoreData
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")
}
}
提取保存的數據
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;
}