ios - 表格 View 单元格中的播放按钮显示错误的视频，因为它没有获得正确的单元格

Question

我有一个表格 View Controller ，我在其中通过单击单元格中的按钮播放视频。

当我尝试在第一个单元格中播放视频时，它会在第二个单元格中播放视频。

我假设问题是因为它无法识别播放视频的正确单元格。

以下是我的代码

var cell : ViewTableCell?

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


        let resusableIdentifier: String = "ViewControllerCell"
        cell = (tableView.dequeueReusableCell(withIdentifier: resusableIdentifier) as? ViewTableCell)

        if cell == nil {
            cell = ViewTableCell(style:UITableViewCellStyle.default, reuseIdentifier: resusableIdentifier)
        }

        cell?.videoName.text = ArtistFeeds.sharedInstance.videoFeeds[indexPath.row].videoTitle


        cell?.playButton.addTarget(self, action: #selector(TrendViewController.onTapPlayButton), for: .touchUpInside)

        cell?.playButton.tag = indexPath.row

        cell?.videoView.bringSubview(toFront: (cell?.videoName)!)
        return cell!
    }
    func onTapPlayButton(sender: subclassedUIButton){

        let indexOfButton = sender.indexPath
        let url = Bundle.main.path(forResource:ArtistFeeds.sharedInstance.videoFeeds[indexOfButton!].videoUrl, ofType:"mp4")

        let path = NSURL.fileURL(withPath: url!)
        let currentCell = trendTableView.cellForRow(at: indexOfButton) as! ViewTableCell
        currentCell.videoPlayerItem = AVPlayerItem.init(url: path)
        currentCell.startPlayback()

    }

当我在 cellForRowAt indexPath 函数中播放时，上面的代码可以正确播放视频

当我尝试通过点击按钮播放时，它会在不同的单元格中播放视频。

同样在 onTapPlayButton() 中我得到以下错误

无法转换“Int”类型的值？到预期的参数类型 'IndexPath'

任何帮助将不胜感激。谢谢。

下面是更新后的代码

class ViewTableCell: UITableViewCell {
var avPlayer: AVPlayer?
    var avPlayerLayer: AVPlayerLayer?
    var paused: Bool = false
    var videoPlayerItem: AVPlayerItem? = nil {
        didSet {

            avPlayer?.replaceCurrentItem(with: self.videoPlayerItem)
        }
    }

    var tapAction: ((ViewTableCell) -> Void)?

    @IBAction func playButtonAction(_ sender: UIButton) {
        tapAction?(self)
    }
func setupMoviePlayer(view:UIView){
        self.avPlayer = AVPlayer.init(playerItem: self.videoPlayerItem)
        avPlayerLayer = AVPlayerLayer(player: avPlayer)
        avPlayerLayer?.videoGravity = AVLayerVideoGravityResizeAspect
        avPlayer?.volume = 3
        avPlayer?.actionAtItemEnd = .none
        avPlayerLayer?.frame = view.bounds
        self.backgroundColor = .clear
        view.layer.insertSublayer(avPlayerLayer!, at: 0)

        let interval = CMTime(value: 1, timescale: 2)
        avPlayer?.addPeriodicTimeObserver(forInterval: interval, queue: DispatchQueue.main, using :{ (progressTime) in
            let seconds = CMTimeGetSeconds(progressTime)

            if let duration = self.avPlayer?.currentItem?.duration{
                let durationSeconds = CMTimeGetSeconds(duration)
                self.videoSlider.value = Float(seconds/durationSeconds)
            }
        })

    }

    func stopPlayback(){
        self.avPlayer?.pause()
    }

    func startPlayback(){
        self.avPlayer?.play()
    }

    override func awakeFromNib() {
        super.awakeFromNib()
        self.setupMoviePlayer(view: videoView)
        // Initialization code
    }
}

广告 View Controller 类

var cell : TrendViewTableCell?
var currentCell = TrendViewTableCell()

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


        let resusableIdentifier: String = "ViewControllerCell"
        cell = (tableView.dequeueReusableCell(withIdentifier: resusableIdentifier) as? ViewTableCell)

        if cell == nil {
            cell = ViewTableCell(style:UITableViewCellStyle.default, reuseIdentifier: resusableIdentifier)
        }

        cell?.videoName.text = ArtistFeeds.sharedInstance.videoFeeds[indexPath.row].videoTitle
        cell?.tapAction = { (cell) in

            self.onTapPlayButton(cell)

        }
        cell?.playButton.addTarget(self, action: #selector(TrendViewController.onTapPlayButton), for: .touchUpInside)
        return cell!
    }

func onTapPlayButton(_ selectedCell:ViewTableCell){

        if let index = self.trendTableView.indexPath(for: selectedCell){
            //put your code to execute here
            let url = Bundle.main.path(forResource:ArtistFeeds.sharedInstance.videoFeeds[index.row].videoUrl, ofType:"mp4")

            let path = NSURL.fileURL(withPath: url!)
            currentCell = tableView.cellForRow(at: index) as! ViewTableCell
            currentCell.videoPlayerItem = AVPlayerItem.init(url: path)
            let playImage = UIImage(named: "image_video_play") as UIImage?
            let pauseImage = UIImage(named: "image_video_pause") as UIImage?
            if currentCell.avPlayer?.rate == 1.0 {
                currentCell.stopPlayback()
                currentCell.playButton.setImage(playImage, for: .normal)

            } else {
                currentCell.startPlayback()
                currentCell.playButton.setImage(pauseImage, for: .normal)
            }
        }
    }

在上面更新的代码中，当我播放视频并滚动表格 View 时，同一视频会在当前正在播放视频的单元格的第三个单元格中播放。

Answer 1

要补救这种情况，您应该做的是在 UITableViewCell 中添加一个委托(delegate)。确保协议(protocol)继承“类”，并使委托(delegate)“弱”以防止引用循环。您可以在 cellForRowAt 委托(delegate)函数中设置委托(delegate)，并在单元格本身内添加/删除播放按钮。每当按下按钮时，委托(delegate)将通过传递行号、电影 ID 或您认为适合您需要的任何内容来通知包含 UITableView 的类。然后您可以打开正确的电影。