獲取所有來自音樂庫的歌曲ios swift 3 xcode 8.2.1

Question

我想從音樂庫中獲取所有歌曲並在我的表格視圖中顯示，然後在表格視圖中選擇多首歌曲並在AVAudioPlayer中播放。但我無法從音樂庫中獲取歌曲並在我的表格視圖中顯示。我訪問了很多鏈接，但沒有爲我工作，請幫助我。這裏是我的代碼

@IBAction func selectMusicFromGallery(_ sender: Any) 
{ 
    mediaPicker = MPMediaPickerController(mediaTypes: .music) 
    mediaPicker.allowsPickingMultipleItems = false 
    mediaPicker.delegate = self 
    // mediaPicker.prompt = "Select Songs" 
    self.present(mediaPicker, animated: true, completion: nil) 
} 

func mediaPicker(_ mediaPicker: MPMediaPickerController, didPickMediaItems mediaItemCollection: MPMediaItemCollection) 
{ 
    let mediaItems = MPMediaQuery.songs().items 
    let mediaCollection = MPMediaItemCollection(items: mediaItems!) 
    let player = MPMusicPlayerController.systemMusicPlayer() 
    player.setQueue(with: mediaCollection) 
    player.play() 
} 

Answer 1

您可以使用此SongQuery.swift類

// // SongQuery.swift //

import Foundation 
import MediaPlayer 

struct SongInfo { 

    var albumTitle: String 
    var artistName: String 
    var songTitle: String 

    var songId : NSNumber 
} 

struct AlbumInfo { 

    var albumTitle: String 
    var songs: [SongInfo] 
} 

class SongQuery { 

    func get(songCategory: String) -> [AlbumInfo] { 

     var albums: [AlbumInfo] = [] 
     let albumsQuery: MPMediaQuery 
     if songCategory == "Artist" { 
      albumsQuery = MPMediaQuery.artists() 

     } else if songCategory == "Album" { 
      albumsQuery = MPMediaQuery.albums() 

     } else { 
      albumsQuery = MPMediaQuery.albums() 
     } 


     // let albumsQuery: MPMediaQuery = MPMediaQuery.albums() 
     let albumItems: [MPMediaItemCollection] = albumsQuery.collections! as [MPMediaItemCollection] 
     // var album: MPMediaItemCollection 

     for album in albumItems { 

      let albumItems: [MPMediaItem] = album.items as [MPMediaItem] 
      // var song: MPMediaItem 

      var songs: [SongInfo] = [] 

      var albumTitle: String = "" 

      for song in albumItems { 
       if songCategory == "Artist" { 
        albumTitle = song.value(forProperty: MPMediaItemPropertyArtist) as! String 

       } else if songCategory == "Album" { 
        albumTitle = song.value(forProperty: MPMediaItemPropertyAlbumTitle) as! String 


       } else { 
        albumTitle = song.value(forProperty: MPMediaItemPropertyAlbumTitle) as! String 
       } 

       let songInfo: SongInfo = SongInfo(
        albumTitle: song.value(forProperty: MPMediaItemPropertyAlbumTitle) as! String, 
        artistName: song.value(forProperty: MPMediaItemPropertyArtist) as! String, 
        songTitle: song.value(forProperty: MPMediaItemPropertyTitle) as! String, 
        songId:  song.value(forProperty: MPMediaItemPropertyPersistentID) as! NSNumber 
       ) 
       songs.append(songInfo) 
      } 

      let albumInfo: AlbumInfo = AlbumInfo(

       albumTitle: albumTitle, 
       songs: songs 
      ) 

      albums.append(albumInfo) 
     } 

     return albums 

    } 

    func getItem(songId: NSNumber) -> MPMediaItem { 

     let property: MPMediaPropertyPredicate = MPMediaPropertyPredicate(value: songId, forProperty: MPMediaItemPropertyPersistentID) 

     let query: MPMediaQuery = MPMediaQuery() 
     query.addFilterPredicate(property) 

     var items: [MPMediaItem] = query.items! as [MPMediaItem] 

     return items[items.count - 1] 

    } 

} 

併爲您的視圖控制器代碼顯示歌曲在桌子視圖控制器中

import UIKit 
import MediaPlayer 
import AVFoundation 

class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource { 

    @IBOutlet var tableView : UITableView? 
    let myTableView: UITableView = UITableView(frame: CGRect.zero, style: .grouped) 

    var albums: [AlbumInfo] = [] 
    var songQuery: SongQuery = SongQuery() 
    var audio: AVAudioPlayer? 

    override func viewDidLoad() { 

     super.viewDidLoad() 
     self.title = "Songs" 
     MPMediaLibrary.requestAuthorization { (status) in 
      if status == .authorized { 
       self.albums = self.songQuery.get(songCategory: "") 
       DispatchQueue.main.async { 
        self.tableView?.rowHeight = UITableViewAutomaticDimension; 
        self.tableView?.estimatedRowHeight = 60.0; 
        self.tableView?.reloadData() 
       } 
      } else { 
       self.displayMediaLibraryError() 
      } 
     } 

    } 

    func displayMediaLibraryError() { 

     var error: String 
     switch MPMediaLibrary.authorizationStatus() { 
     case .restricted: 
      error = "Media library access restricted by corporate or parental settings" 
     case .denied: 
      error = "Media library access denied by user" 
     default: 
      error = "Unknown error" 
     } 

     let controller = UIAlertController(title: "Error", message: error, preferredStyle: .alert) 
     controller.addAction(UIAlertAction(title: "OK", style: .cancel, handler: nil)) 
     controller.addAction(UIAlertAction(title: "Open Settings", style: .default, handler: { (action) in 
      if #available(iOS 10.0, *) { 
       UIApplication.shared.open(URL(string: UIApplicationOpenSettingsURLString)!, options: [:], completionHandler: nil) 
      } else { 
       // Fallback on earlier versions 
      } 
     })) 
     present(controller, animated: true, completion: nil) 
    } 

    override func didReceiveMemoryWarning() { 

     super.didReceiveMemoryWarning() 

    } 

    func numberOfSections(in tableView: UITableView) -> Int { 
     return albums.count 
    } 

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 

     return albums[section].songs.count 
    } 

    func tableView(_ tableView: UITableView, cellForRowAt indexPath:IndexPath) -> UITableViewCell { 

     let cell = tableView.dequeueReusableCell(
      withIdentifier: "MusicPlayerCell", 
      for: indexPath) as! MusicPlayerCell 
     cell.labelMusicTitle?.text = albums[indexPath.section].songs[indexPath.row].songTitle 
     cell.labelMusicDescription?.text = albums[indexPath.section].songs[indexPath.row].artistName 
     let songId: NSNumber = albums[indexPath.section].songs[indexPath.row].songId 
     let item: MPMediaItem = songQuery.getItem(songId: songId) 

     if let imageSound: MPMediaItemArtwork = item.value(forProperty: MPMediaItemPropertyArtwork) as? MPMediaItemArtwork { 
      cell.imageMusic?.image = imageSound.image(at: CGSize(width: cell.imageMusic.frame.size.width, height: cell.imageMusic.frame.size.height)) 
     } 
     return cell; 
    } 

    func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? { 

     return albums[section].albumTitle 
    } 
} 

**

不要忘記添加框架MediaPlayer.framework， MediaToolbox.framework，AudioToolbox.framework

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