OSStatus错误1685348671 AVAudioPlayer

Question

我试图用Alamofire下载mp3文件并将其保存到所需的位置。然后，从那个位置，我试图播放该文件，但它给了我一个错误。

这是下载功能

func downloadSong(song: Song, completion: @escaping(Bool) ->()) { 

     var headers: HTTPHeaders = [:] 

     if let authorizationHeader = Request.authorizationHeader(user: Constants.authName, password: Constants.authKey) { 
      headers[authorizationHeader.key] = authorizationHeader.value 
     } 

     let destination: DownloadRequest.DownloadFileDestination = { _, _ in 
      let documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first! 
      let fileURL = documentsURL.appendingPathComponent("\(song.getID()).mp3") 

      return (fileURL, [.removePreviousFile, .createIntermediateDirectories]) 
     } 

     Alamofire.download(APIEndpoint.Song(id: song.getID(), token: self.authToken!).path(), method: .get, headers: headers, to: destination).response { (response) in 
      if response.error == nil, let filePath = response.destinationURL?.path { 
       print(filePath) 
       completion(true) 
      } else { 
       completion(false) 
      } 
     } 

    } 

这是一个播放功能

func playSong() { 

     guard let songs = currentPlaylist?.getSongs() else { return } 

     let song = songs[0] 

     let documentsDirectoryURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first! 

     let destinationUrl = documentsDirectoryURL.appendingPathComponent("\(song.getID()).mp3") 
     print(destinationUrl) 

     if FileManager.default.fileExists(atPath: destinationUrl.path) { 
      print("The file already exists at path") 

      do { 
       try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback) 
       try AVAudioSession.sharedInstance().setActive(true) 

       player! = try AVAudioPlayer(contentsOf: destinationUrl, fileTypeHint: AVFileTypeMPEGLayer3) 

       player!.play() 
      } catch let error as NSError { 
       print("error: \(error.localizedDescription)") 
      } 
     } 

    } 

我想知道下载文件并保存它，然后发挥它的最佳实践。

Answer 1

我发现，我输入了错误的API网址，所以它给了我无效的无效文件。