비디오 뷰어의 미리보기 이미지를 테이블 뷰 목록에로드하는 방법 비동기식

Question

비디오 URL에 묶음에서 미리보기 이미지를로드하는 데모를 만들었습니다. 이제로드 된 모든 미리보기 이미지를 내 tableview 목록에 표시하고 싶지만 문제가 있습니다. tablview 모든 축소판 이미지를 다운로드 할 때까지 내 tableview 잘 (스크롤링) 비동기 스레드를 사용하지만 20-25 초 후에 모든 축소판 이미지를로드 할 교수형있어.

여기 SDWebImages처럼 나에게 뭔가를 내가 원하는 가능한 솔루션을 제공하십시오 내 코드

@IBOutlet weak var tableviewList:UITableView! 
    var listArray:[String] = ["https://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4", 
           "http://techslides.com/demos/sample-videos/small.mp4", 
           "http://jplayer.org/video/m4v/Big_Buck_Bunny_Trailer.m4v", 
           "https://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4", 
           "http://techslides.com/demos/sample-videos/small.mp4", 
           "http://jplayer.org/video/m4v/Big_Buck_Bunny_Trailer.m4v", 
           "https://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4", 
           "http://techslides.com/demos/sample-videos/small.mp4", 
           "http://jplayer.org/video/m4v/Big_Buck_Bunny_Trailer.m4v" 
           ] 

    override func viewDidLoad() { 

     super.viewDidLoad() 
     self.tableviewList.register(UINib(nibName: "ListTableViewCell", bundle: nil), forCellReuseIdentifier: "ListTableViewCell") 

     for aryString in self.listArray 
     { 
      self.createThumbnailOfVideoFromFileURL(aryString) 
     } 
    } 
    override func didReceiveMemoryWarning() { 
     super.didReceiveMemoryWarning() 
     // Dispose of any resources that can be recreated. 
    } 

    public func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
    { 
      return self.listArray.count 
    } 

    public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell 
    { 
      let cell = tableView.dequeueReusableCell(withIdentifier: "ListTableViewCell", for: indexPath) as! ListTableViewCell 

     let strUrl = self.listArray[indexPath.row] 

     DispatchQueue.global(qos: .userInitiated).async { 
      // Download file or perform expensive task 
      cell.imageviewThumb?.image = self.getThumbnailFrom(path: URL.init(string:strUrl)!) 
      DispatchQueue.main.async { 
       // Update the UI 
      } 
     } 

     cell.selectionStyle = UITableViewCellSelectionStyle.none 

      return cell 
    } 

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) { 

     let stringUrl:String = self.listArray[indexPath.row] 
     let videoUrl = NSURL(string:stringUrl) 
     let player = AVPlayer(url:videoUrl as! URL) 
     let playerviewController = AVPlayerViewController() 
     playerviewController.player = player 

     self.present(playerviewController, animated: true, completion: { 
      playerviewController.player?.play() 
     }) 
    } 

    public func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat 
    { 
     return 300 
    } 

    func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool { 

    return true 

    } 

    func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) { 
     if (editingStyle == UITableViewCellEditingStyle.delete) { 
      // handle delete (by removing the data from your array and updating the tableview) 
     } 
    } 


    func getThumbnailFrom(path: URL) -> UIImage? { 
     do { 

      let asset = AVURLAsset(url: path , options: nil) 
      let imgGenerator = AVAssetImageGenerator(asset: asset) 
      imgGenerator.appliesPreferredTrackTransform = true 
      let cgImage = try imgGenerator.copyCGImage(at: CMTimeMake(0, 1), actualTime: nil) 
      let thumbnail = UIImage(cgImage: cgImage) 
      return thumbnail 

     } catch let error { 
      print("*** Error generating thumbnail: \(error.localizedDescription)") 
      return nil 
     } 
    } 

이지만하지 비디오 썸네일에 대한 이미지 만에 유용합니다. 나는 빠른 3.0 솔루션 .Thanks 사전에

Answer 1

나에게 답장을주기 위해이

do { 
      let asset = AVURLAsset(url: url , options: nil) 
      let imgGenerator = AVAssetImageGenerator(asset: asset) 
      imgGenerator.appliesPreferredTrackTransform = true 
      let cgImage = try imgGenerator.copyCGImage(at: CMTimeMake(0, 1), actualTime: nil) 
      thumbnail = UIImage(cgImage: cgImage) 





     } catch let error { 
      print("*** Error generating thumbnail: \(error.localizedDescription)") 
     } 

    }