Swift

Question

我正在尝试制作视频播放器，我需要通过 UISlider 和 UILabel（用于更新时间）来显示进度。这是我的代码

let videoPlayer = AVPlayer()
var videoPlayerSlider: UISlider = UISlider()
var videoPlayerLabel: UILabel = UILabel()

    func updateVideoPlayerSlider() {
        guard let currentTime = videoPlayer.currentTime else {
            return
        }
        let mins = currentTime / 60
        let secs = currentTime.truncatingRemainder(dividingBy: 60)
        let timeformatter = NumberFormatter()
        timeformatter.minimumIntegerDigits = 2
        timeformatter.minimumFractionDigits = 0
        timeformatter.roundingMode = .down
        guard let minsStr = timeformatter.string(from: NSNumber(value: mins)), let secsStr = timeformatter.string(from: NSNumber(value: secs)) else {
            return
        }
        videoPlayerLabel.text = "\(minsStr).\(secsStr)"
        videoPlayerSlider.value = Float(videoPlayer.currentTime())
    }

显示 2 个错误。

1.（在函数的第一行）条件绑定的初始化器必须有可选类型，而不是 '() -> CMTime

2.（在函数的最后一行）无法使用类型为“(CMTime)”

的参数列表调用类型 'Float' 的初始值设定项

如有任何帮助，我们将不胜感激。

Answer 1

let videoPlayer = AVPlayer()
var videoPlayerSlider: UISlider = UISlider()
var videoPlayerLabel: UILabel = UILabel()

func updateVideoPlayerSlider() {
    // 1 . Guard got compile error because `videoPlayer.currentTime()` not returning an optional. So no just remove that.
    let currentTimeInSeconds = CMTimeGetSeconds(videoPlayer.currentTime())
    // 2 Alternatively, you could able to get current time from `currentItem` - videoPlayer.currentItem.duration

    let mins = currentTimeInSeconds / 60
    let secs = currentTimeInSeconds.truncatingRemainder(dividingBy: 60)
    let timeformatter = NumberFormatter()
    timeformatter.minimumIntegerDigits = 2
    timeformatter.minimumFractionDigits = 0
    timeformatter.roundingMode = .down
    guard let minsStr = timeformatter.string(from: NSNumber(value: mins)), let secsStr = timeformatter.string(from: NSNumber(value: secs)) else {
        return
    }
    videoPlayerLabel.text = "\(minsStr).\(secsStr)"
    videoPlayerSlider.value = Float(currentTimeInSeconds) // I don't think this is correct to show current progress, however, this update will fix the compile error

    // 3 My suggestion is probably to show current progress properly
    if let currentItem = videoPlayer.currentItem {
        let duration = currentItem.duration
        if (CMTIME_IS_INVALID(duration)) {
            // Do sth
            return;
        }
        let currentTime = currentItem.currentTime()
        videoPlayerSlider.value = Float(CMTimeGetSeconds(currentTime) / CMTimeGetSeconds(duration))
    }
}

希望对您有所帮助

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