コードは以下のようになっています。 MediaViewController.swift

import UIKit import MediaPlayer var printnumber: Int = 1 class MediaViewController: UITableViewController, MPMediaPickerControllerDelegate { fileprivate let numberOfRingtones = 3 var mediaItem: MPMediaItem? var mediaLabel: String! var mediaID: String! override func viewDidLoad() { super.viewDidLoad() } override func viewWillDisappear(_ animated: Bool) { //performSegue(withIdentifier: Id.soundUnwindIdentifier, sender: self) }

...

 func mediaPicker(_ mediaPicker: MPMediaPickerController, didPickMediaItems mediaItemCollection:MPMediaItemCollection) -> Void { if !mediaItemCollection.items.isEmpty { let aMediaItem = mediaItemCollection.items[0] self.mediaItem = aMediaItem mediaID = (self.mediaItem?.value(forProperty: MPMediaItemPropertyPersistentID)) as? String self.dismiss(animated: true, completion: nil) } } func mediaPickerDidCancel(_ mediaPicker: MPMediaPickerController) { self.dismiss(animated: true, completion: nil) } }

AlarmAddEditViewController.swift

 @IBAction func unwindFromMediaView(_ segue: UIStoryboardSegue) { let src = segue.source as! MediaViewController segueInfo.mediaLabel = src.mediaLabel segueInfo.mediaID = src.mediaID }

(edited)