如何使用swift在进度条上显示AVAudioPlayer？

Question

我正在用AVAudioPlayer播放一首歌。我需要一个进度条来显示歌曲的进度。

我的问题是进度条不能正常工作。在2-3秒内，它完成了它的进度。

func playMusic() {

    do {
        player = try AVAudioPlayer(contentsOf: (currentSong?.mediaURL)!)
        guard let player = player else { return }

        player.prepareToPlay()
        player.play()


        updater = CADisplayLink(target: self, selector: #selector(self.musicProgress))
        updater.frameInterval = 1
        updater.add(to: RunLoop.current, forMode: RunLoop.Mode.common)

        playButton.setImage(UIImage.init(named: "pause"), for: .normal)
    } catch let error as NSError {
        print(error.description)
    }
}

@objc func musicProgress()  {

    let normalizedTime = Float(self.player?.currentTime as! Double * 100.0 / (self.player?.duration as! Double) )
    self.progressMusic.progress = normalizedTime
}

Answer 1

问题就在这里：

let normalizedTime = Float(self.player?.currentTime as! Double * 100.0 / (self.player?.duration as! Double) )

这样，您将获得一个介于0.0和100.0之间的值，但是根据UIProgressView文档，progress必须介于0.0和1.0之间。试一试

let normalizedTime = Float(self.player?.currentTime as! Double / (self.player?.duration as! Double) )