Swift从零开始写一个简单的iOS播放器

语言版本: Swift4.2

先看一下效果图吧

简单播放器效果图

核心是AVPlayer,先用以下代码实现简单的视频播放

self.view.addSubview(displayView)
guard let url = URL(string: self.videoUrl) else {
    return
}
let videoAsset = AVAsset.init(url: url)
let videoPlayItem = AVPlayerItem(asset: videoAsset)
self.player = AVPlayer(playerItem: videoPlayItem)
let playerLayer = AVPlayerLayer(player: player)
playerLayer.frame = displayView.frame
displayView.layer.addSublayer(playerLayer)

然后就是对player的一些操作

self.player?.pause() //暂停
self.player?.play() // 播放

接下来就是播放时跳转到某一位置,我是通过自定义的进度条和滑动手势来做的实现

首先,视频一边播放小滑块需要实时滑动,通过以下代码实现

// 设置控制器数值
let interval: CMTime = CMTime(seconds: 1.0, preferredTimescale: CMTimeScale.init(1))
self.playerObserve = self.player?.addPeriodicTimeObserver(forInterval: interval, queue: DispatchQueue.main, using: { [weak self] (cmTime) in
    
    if (self?.isSliding ?? false) == false {
        let secondNow = CMTimeGetSeconds(cmTime)
        self?.allTime = CMTimeGetSeconds(videoPlayItem.asset.duration)
        
        guard let theAllTime = self?.allTime else {
            return
        }
        
        self?.leftTimeLabel.text = self?.formatPlayerTime(sourceTime: secondNow)
        self?.rightTimeLabel.text = self?.formatPlayerTime(sourceTime: theAllTime)
        let p = Float(secondNow / theAllTime)
        self?.videoProgressView.progress = p
        
        guard let thePoint = self?.sliderOrigiPoint,
            let theSize = self?.sliderSize,
            let theprogressWidth = self?.progressWidth else {
            return
        }
        
        self?.sliderView.frame = CGRect(x: thePoint.x +  CGFloat(p) * theprogressWidth , y: thePoint.y, width: theSize.width, height: theSize.height)
    }
    
})

其中需要注意的就是全局变量isSliding, 当用户在滑动开始的时候停止视频播放,滑动结束时在新的位置播放,具体如下:

    lazy var sliderView: UIImageView = {
        let a = UIImageView()
        a.image = UIImage(named: "sp_370_point", in: Bundle(for: self.classForCoder), compatibleWith: nil)
        let panGesture = UIPanGestureRecognizer(target: self, action: #selector(dragSlider(sender:)))
        a.isUserInteractionEnabled = true
        a.isMultipleTouchEnabled = true
        a.addGestureRecognizer(panGesture)
        return a
    }()

拖动时操作

    @objc private func dragSlider(sender: UIPanGestureRecognizer) {

        switch sender.state {
        case .began:
            lastLocation = sliderView.center
            self.player?.pause()
            self.isSliding = true
        case .ended:
            self.isSliding = false
            
            // 计算出进度,跳转进度
            let p = (self.sliderView.frame.origin.x - self.sliderOrigiPoint.x) / self.progressWidth
            let cmTime = CMTime(seconds: Double(p) * self.allTime, preferredTimescale: CMTimeScale(1))
            self.player?.seek(to: cmTime)
            
            self.player?.play()
        default:
            let translation  = sender.translation(in: self.view)
            let newCenterX = lastLocation.x + translation.x
            let judgeX = newCenterX - self.sliderSize.width / 2
            guard judgeX >= self.sliderOrigiPoint.x else {
                sliderView.center = CGPoint(x: self.sliderOrigiPoint.x + (self.sliderSize.width / 2), y: lastLocation.y)
                return
            }
            guard judgeX <= self.sliderOrigiPoint.x + self.progressWidth else {
                sliderView.center = CGPoint(x: self.sliderOrigiPoint.x + self.progressWidth + (self.sliderSize.width / 2), y: lastLocation.y)
                return
            }
            sliderView.center = CGPoint(x: lastLocation.x + translation.x, y: lastLocation.y)
        }
    }