[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播放視頻。 我遵循了此視頻教程, 讓我們構建該應用程序
我使用UISlider / scrubber以及視頻的當前幀/時間。
我有一個10.43秒的視頻,並且我使用了快進功能,將我帶到了盡頭。
@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)
}
視頻播放到最后,但問題是滑塊僅到達10秒點,而我無法到達最后的0.43秒。 我收到以下警告消息:
滑塊的值是在player?.addPeriodicTimeObserver()
確定的player?.addPeriodicTimeObserver()
因此,當我按快進而不是滑塊到達終點時,它會停止幾個點的距離(注意空白):
如何獲得更准確的值,以便滑塊可以一直擦洗到底?
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
有一個seek
方法:
player.seek(to: <CMTime>, toleranceBefore: <CMTime>, toleranceAfter: <CMTime>)
使用這種方法,您可以在其上設置容差以補償截斷的溢出,在我的情況下,截斷的溢出是額外的-0.433秒。
在第一個參數中,您輸入了尋找的時間;在第二個和第三個參數中, kCMTimeZero
。 像這樣:
// seekTime is the time I’m seeking to
player.seek(to: seekTime, toleranceBefore: kCMTimeZero, toleranceAfter: kCMTimeZero)
我也遵循了這個答案 ,訣竅在於,當我為第二個參數初始化搜索時間時,必須投入1000才能正常工作。 像這樣:
let seekTime: CMTime = CMTimeMakeWithSeconds(duration, 1000)
這是我的快進按鈕的代碼:
@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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