如何在 tableViewCell 中控制 AVPlayer（通过滑块和搜索播放、暂停、进度）？

Question

我正在尝试使用 AVPlayerLayer 和 AVPlayer 使 tableViewCell 内的视图播放视频。它在按钮点击时播放和暂停。 这已成功完成。 但现在我想展示视频的进度。当我点击播放和暂停按钮时，我可以通过自定义委托在我的 tableView 类中获取currentTime()。但我需要继续观察进展。我没有找到任何代表（可能是我弄错了文档中列出的代表）。如何实现我的目标？

这是我的 playerView 类：

import UIKit
import AVKit
import AVFoundation

class CustomPlayerView: UIView {

    override static var layerClass: AnyClass {
        return AVPlayerLayer.self
    }

    var playerLayer: AVPlayerLayer {
        return layer as! AVPlayerLayer
    }

    var player: AVPlayer? {
        get {
            return playerLayer.player
        }
        set {
            playerLayer.player = newValue
        }
    }
}

这是 tableViewCell 类：

import UIKit
import AVFoundation
import AVKit

class VideoCell: UITableViewCell {

    @IBOutlet weak var myPlayerView: CustomPlayerView!
    @IBOutlet var playButton: UIButton!
    @IBOutlet var mySlider: UISlider!

    var videoPlayDelegate: videoDidplay!

    override func awakeFromNib() {
        super.awakeFromNib()
    }

}

以下是 cellForRow 和自定义委托函数：

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "vidCell", for: indexPath) as! VideoCell
        let vidUrl = aRR_VidURL[indexPath.row]
        let avPlayer = AVPlayer(url: URL(string: vidUrl)!)
        cell.myPlayerView.playerLayer.player = avPlayer
        cell.playButton.tag = indexPath.row
        cell.playButton.addTarget(self, action: #selector(playAction(sender:)), for: .touchUpInside)
        return cell
    }

@objc fileprivate func playAction(sender: UIButton) {
        let cell = tableView.cellForRow(at: IndexPath(row: sender.tag, section: 0)) as! VideoCell
        cell.videoPlayDelegate = self
        if sender.currentTitle == "Play" {
            cell.myPlayerView.player?.play()
            sender.setTitle("Pause", for: .normal)
            cell.videoPlayDelegate.videoPlaying(cell: cell, playerView: cell.myPlayerView)
        } else if sender.currentTitle == "Pause" {
            cell.myPlayerView.player?.pause()
            sender.setTitle("Play", for: .normal)
            cell.videoPlayDelegate.videoPlaying(cell: cell, playerView: cell.myPlayerView)
        }
    }

protocol videoDidplay {
    func videoPlaying(cell: VideoCell, playerView: CustomPlayerView)
}

谢谢！

Answer 1

您必须为滑块编写一个函数，就像为按钮操作编写的一样。 可能是这样的：

cellForRow 方法更改为：

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "vidCell", for: indexPath) as! VideoCell
        let vidUrl = aRR_VidURL[indexPath.row]
        let avPlayer = AVPlayer(url: URL(string: vidUrl)!)
        cell.myPlayerView.playerLayer.player = avPlayer  
        cell.slider.addTarget(self, action: #selector(playbackSliderValueChanged), for: .valueChanged)
        cell.playButton.tag = indexPath.row
        cell.playButton.addTarget(self, action: #selector(playAction(sender:)), for: .touchUpInside)
        return cell
    }

滑块功能：

func playbackSliderValueChanged(sender: UISlider)
{
    let position = (sender as AnyObject).convert(CGPoint.zero, to: self.tableView)
    let indexPath = self.tableView.indexPathForRow(at: position)!
    let cell = tableView.cellForRow(at: IndexPath(row: indexPath.row, section: 0)) as! VideoCell

    if let duration = cell.myPlayerView.player?.currentItem?.duration
    {
        let totalSeconds = CMTimeGetSeconds(duration)
        let value = Float64(sender.value) * totalSeconds
        let seekTime = CMTime(value: Int64(value), timescale:1)
        cell.myPlayerView.player?.seek(to: seekTime)
    }

    if cell.myPlayerView.player!.rate == 0
    {
        cell.myPlayerView.player?.play()
    }
    else
    {
        cell.myPlayerView.player?.pause()

    }
}