如何解决Swift 5-如何获得AVPlayer持续时间
我正在尝试使用AVPlayer [不是AVAudioPlayer]来获取音频的持续时间,但是它总是获取NaN。
这是我在做什么:
let urlString = dataModel.currentPodcast.url.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)
let asset = AVAsset(url: URL.init(string: urlString!)!)
playerItem = AVPlayerItem(asset: asset)
DispatchQueue.main.async {
player = AVPlayer(playerItem: playerItem)
}
self.epTotalTime.text = self.secondsToFormattedString(player.currentItem.asset.duration)
所以我尝试这样做:
durationObserver = playerItem?.observe(\AVPlayerItem.status,changeHandler: { observedPlayerItem,change in
if (observedPlayerItem.status == AVPlayerItem.Status.readyToPlay) {
self.epTotalTime.text = self.secondsToFormattedString(totalSeconds: CMTimeGetSeconds(observedPlayerItem.asset.duration))
}
})
在这里,totalSeconds仍然是NaN:
private func secondsToFormattedString(totalSeconds: Float64) -> String {
guard !(totalSeconds.isNaN || totalSeconds.isInfinite) else {
return "--:--"
}
let hours:Int = Int(totalSeconds.truncatingRemainder(dividingBy: 86400) / 3600)
let minutes:Int = Int(totalSeconds.truncatingRemainder(dividingBy: 3600) / 60)
let seconds:Int = Int(totalSeconds.truncatingRemainder(dividingBy: 60))
if hours > 0 {
return String(format: "%i:%02i:%02i",hours,minutes,seconds)
} else {
return String(format: "%02i:%02i",seconds)
}
}
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