swift - 如何使用NSURL数组添加到收藏夹

Question

I'm trying to build an app stores specific sounds which user can play. I assure you I've searched for 2 days but I couldn't what I look for. (Or I couldn't successful with those tuts idk)

The app stores sounds like this:

var sound1 = NSURL(fileURLWithPath: Bundle.main.path(forResource: "Adios Amigos", ofType: "mp3")!)
var sound2 = NSURL(fileURLWithPath: Bundle.main.path(forResource: "ses2", ofType: "mp3")!)
var sound3 = NSURL(fileURLWithPath: Bundle.main.path(forResource: "ses3", ofType: "mp3")!)
var sound4 = NSURL(fileURLWithPath: Bundle.main.path(forResource: "ses4", ofType: "mp3")!)



    var soundArray: [NSURL] = [sound1, sound2, sound3, sound4]

here is my button that play sounds as random:

    @IBAction func Rastgele(sender: Any) {

            let randNo = Int(arc4random_uniform(UInt32(soundArray.count))) // 0...ArrayCount

            do {
                try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback)
                try AVAudioSession.sharedInstance().setActive(true)
                try audioPlayer = AVAudioPlayer(contentsOf: (soundArray[randNo] as NSURL) as URL)
                audioPlayer.prepareToPlay()
                audioPlayer.play()

                self.sesLabel.text = soundArray[randNo].deletingPathExtension?.lastPathComponent
                soundIndex = randNo} catch {
                print(error)
            }

}

and here is my IBAction button that I couldn't fill inside with code.

       @IBAction func Favori(_ sender: Any) {
// empty    
        }

I tried to use NSUserdefaults but I couldn't achieve what I want. I also tried to pull the array item from my array to insert another array but I faced many problems with because of type of array(NSURL)

So, 'Favori' button should store as Favorites then I can show favorited sounds in other table view.

Thanks in advance.

EDIT

I found a solution using Core Data and converting NSURLs to URL. Thanks to the @rmaddy for helpful comment. The working code is down below;

@IBAction func Favori(_ sender: Any) {



        // save core data
        let app = UIApplication.shared.delegate as! AppDelegate
        let context = app.persistentContainer.viewContext

        let newSound = NSEntityDescription.entity(forEntityName: "Sounds", in: context)
        let sound = NSManagedObject(entity: newSound!, insertInto: context)



        sound.setValue(soundArray[soundIndex].deletingPathExtension().lastPathComponent, forKey: "soundName")


        do {  try context.save()

            soundItems.append(sound)

            print(sound)
        }
        catch
        {
            print("error")
        }

    }

Answer 1

When you click on the button, save the URL into core data or a local data base using sqlite or a server. If you just want to pass it to another tableview without saving it (data will lost when you kill the app), you can pass that around using a delegate or notification center .