[英]IOS-SWIFT- How to resolve the warning from the Apple Documentation Code about KVO? Why Xcode auto correction introduced an error?
[英]Swift iOS -CMTimeMakeWithSeconds: warning: error of -0.433 introduced due to very low timescale
我正在使用AVPlayer播放视频。 我遵循了此视频教程, 让我们构建该应用程序
我使用UISlider / scrubber以及视频的当前帧/时间。
我有一个10.43秒的视频,并且我使用了快进功能,将我带到了尽头。
@objc fileprivate func fastForwardButtonTapped() {
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)
}
视频播放到最后,但问题是滑块仅到达10秒点,而我无法到达最后的0.43秒。 我收到以下警告消息:
滑块的值是在player?.addPeriodicTimeObserver()
确定的player?.addPeriodicTimeObserver()
因此,当我按快进而不是滑块到达终点时,它会停止几个点的距离(注意空白):
如何获得更准确的值,以便滑块可以一直擦洗到底?
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>)
使用这种方法,您可以在其上设置容差以补偿截断的溢出,在我的情况下,截断的溢出是额外的-0.433秒。
在第一个参数中,您输入了寻找的时间;在第二个和第三个参数中, kCMTimeZero
。 像这样:
// seekTime is the time I’m seeking to
player.seek(to: seekTime, toleranceBefore: kCMTimeZero, toleranceAfter: kCMTimeZero)
我也遵循了这个答案 ,诀窍在于,当我为第二个参数初始化搜索时间时,必须投入1000才能正常工作。 像这样:
let seekTime: CMTime = CMTimeMakeWithSeconds(duration, 1000)
这是我的快进按钮的代码:
@objc fileprivate func fastForwardButtonTapped() {
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)
}
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