swiftAVPlayerLayer视频进度条如何操作纯代码

要操作AVPlayerLayer视频进度条，你需要进行以下步骤：

导入AVFoundation框架：

import AVFoundation

创建一个AVPlayer对象和一个AVPlayerLayer对象：

let player = AVPlayer()
let playerLayer = AVPlayerLayer(player: player)

设置AVPlayerLayer对象的frame和视频填充模式：

playerLayer.frame = CGRect(x: 0, y: 0, width: 300, height: 200)
playerLayer.videoGravity = .resizeAspect

将AVPlayerLayer对象添加到你的视图中：

view.layer.addSublayer(playerLayer)

创建一个UISlider对象用于展示视频进度条，并设置其frame和其他属性：

let slider = UISlider(frame: CGRect(x: 0, y: 250, width: 300, height: 20))
slider.minimumValue = 0
slider.maximumValue = 1
slider.addTarget(self, action: #selector(handleSliderValueChanged(_:)), for: .valueChanged)
view.addSubview(slider)

实现方法handleSliderValueChanged(_:)

@objc func handleSliderValueChanged(_ sender: UISlider) {
    let value = sender.value
    let duration = CMTimeGetSeconds(player.currentItem?.duration ?? CMTime.zero)
    let seekTime = CMTime(seconds: duration * Double(value), preferredTimescale: 1)
    player.seek(to: seekTime)
}

在你需要播放视频的地方，设置AVPlayer对象的URL，并调用play()方法开始播放：

let videoURL = URL(string: "your_video_url")
let playerItem = AVPlayerItem(url: videoURL)
player.replaceCurrentItem(with: playerItem)
player.play()

这样就可以通过滑动进度条来控制视频的进度了