我正在使用AVPlayer播放视频。我按照这个视频教程Let's Build That App
我使用UISlider / scrubber来跟随视频的当前帧/时间。
我有一个10.43秒的视频,我使用快进功能,将我带到最后。
@objc fileprivate func handleFastForward(){
guard let playerItem = playerItem else { return }
guard let player = player else { return }
let duration: Float64 = CMTimeGetSeconds(playerItem.duration)
let seekTime: CMTime = CMTimeMakeWithSeconds(duration, 1)
player.seek(to: seekTime)
}
视频进入最后但问题是滑块只能达到10秒点,我无法让它到达最后的.43秒。我收到一条警告信息:
滑块的值是在player?.addPeriodicTimeObserver()
中确定的。因此,当我按下快进而不是滑块到达最后时,它会停止几个点(注意空白区域):
如何获得更准确的值,以便我的滑块可以一直擦洗到最后?
playerItem?.addObserver(self, forKeyPath: #keyPath(AVPlayerItem.status),
options: [.old, .new],
context: &playerItemContext)
let interval = CMTime(value: 1, timescale: 2)
timeObserverToken = player?.addPeriodicTimeObserver(forInterval: interval, queue: DispatchQueue.main, using: {
[weak self] (progressTime) in
let seconds = CMTimeGetSeconds(progressTime)
let secondsString = String(format: "%02d", Int(seconds) % 60)
let minutesString = String(format: "%02d", Int(seconds) / 60)
self?.currentTimeLabel.text = "\(minutesString):\(secondsString)"
if let duration = self?.playerItem!.duration{
let durationSeconds = CMTimeGetSeconds(duration)
self?.slider.value = Float(seconds / durationSeconds) // SLIDER IS UPDATED HERE
}
})
我做了一些研究,AVPlayer
有一个seek
方法:
player.seek(to: <CMTime>, toleranceBefore: <CMTime>, toleranceAfter: <CMTime>)
使用此方法,您可以在其上设置公差以补偿截断溢出,在我的情况下,这是额外的-0.433秒。
在第一个参数中,您将时间放在了kCMTimeZero
中的第二个和第三个参数中。像这样:
// seekTime is the time I’m seeking to
player.seek(to: seekTime, toleranceBefore: kCMTimeZero, toleranceAfter: kCMTimeZero)
我也跟着this answer,诀窍是当我初始化第二个参数的寻道时间时,我必须把1000放在一起工作。像这样:
let seekTime: CMTime = CMTimeMakeWithSeconds(duration, 1000)
这是我的快进按钮的代码:
@objc fileprivate func handleFastForward(){
guard let playerItem = playerItem else { return }
guard let player = player else { return }
let duration: Float64 = CMTimeGetSeconds(playerItem.duration)
let seekTime: CMTime = CMTimeMakeWithSeconds(duration, 1000)
player.seek(to: seekTime, toleranceBefore: kCMTimeZero, toleranceAfter: kCMTimeZero)
}