上下刷视频刷的快的话，必crash

[yuanzhiying]

func respondWithDataForRequest(loadingRequest:AVAssetResourceLoadingRequest) -> Bool {
let mimeType = self.response?.mimeType ?? ""
let contentType = UTTypeCreatePreferredIdentifierForTag(kUTTagClassMIMEType, mimeType as CFString, nil)
loadingRequest.contentInformationRequest?.isByteRangeAccessSupported = true
loadingRequest.contentInformationRequest?.contentType = contentType?.takeRetainedValue() as String?
// 崩溃位置 ---
loadingRequest.contentInformationRequest?.contentLength = (self.response?.expectedContentLength)!

    var startOffset:Int64 = loadingRequest.dataRequest?.requestedOffset ?? 0
    if loadingRequest.dataRequest?.currentOffset != 0 {
        startOffset = loadingRequest.dataRequest?.currentOffset ?? 0
    }
    
    if Int64(data?.count ?? 0)  < startOffset {
        return false
    }
    
    let unreadBytes:Int64 = Int64(data?.count ?? 0) - (startOffset)
    let numberOfBytesToRespondWidth:Int64 = min(Int64(loadingRequest.dataRequest?.requestedLength ?? 0), unreadBytes)
    if let subdata = (data?.subdata(in: Int(startOffset)..<Int(startOffset + numberOfBytesToRespondWidth)))  {
        loadingRequest.dataRequest?.respond(with: subdata)
        let endOffset:Int64 = startOffset + Int64(loadingRequest.dataRequest?.requestedLength ?? 0)
        return Int64(data?.count ?? 0) >= endOffset
    }
    return false
}

[TJDaDa]

1. 不要在set里面创建对象, 滑动cell会导致偶尔没释放内存增加堆栈闪退.

• self?.urlAsset = AVURLAsset.init(url: url, options: nil)
  self?.urlAsset?.resourceLoader.setDelegate(self, queue: DispatchQueue.main)
  if let asset = self?.urlAsset {
  self?.playerItem = AVPlayerItem.init(asset: asset)
  self?.playerItem?.addObserver(self!, forKeyPath: "status", options: [.initial, .new], context: nil)
  self?.player = AVPlayer.init(playerItem: self?.playerItem)
  self?.playerLayer.player = self?.player

2. 要在初始化里面创建对象, set里面只赋值, 滑动cell就不用每次释放对象了.

• func initSubView() {
  playerLayer = AVPlayerLayer.init(player: player)
  playerLayer!.videoGravity = .resizeAspect
  self.layer.addSublayer(self.playerLayer!)

   player = AVPlayer()
   playerLayer!.player = player
  

  }

      if let url = sourceURL {
           let urlAsset = AVAsset(url: url)
           let playerItem = AVPlayerItem(asset: urlAsset)
           player!.replaceCurrentItem(with: playerItem)
           player?.currentItem!.addObserver(self, forKeyPath: "status", options: [.initial, .new], context: nil)
           addProgressObserver()
       }