>我正在使用AVPlayer播放mp3音频文件。我正在使用我测试过的网址并且工作正常。我需要使用 AVPlayer,因为我需要以编程方式设置 UISlider,而 AVPlayer 很方便。UISlider 在播放音频时工作和更新。音频可能正在播放,但我听不到声音。我这样说是因为UISlider正在工作。
更新:在模拟器上构建应用时,可以听到音频。在设备上构建它时出现问题 - 我的是 XS MAX。
链接到屏幕记录 ->访问: https://streamable.com/nkbn8
我尝试在AVAudioPlayer和音频播放中使用相同的URL,您可以听到它。
private func setupAudioContent() {
let urlString = "https://s3.amazonaws.com/kargopolov/kukushka.mp3"
if let url = NSURL(string: urlString) {
audioPlayer = AVPlayer(url: url as URL)
let playerLayer = AVPlayerLayer(player: audioPlayer)
self.layer.addSublayer(playerLayer)
playerLayer.frame = self.frame
audioPlayer?.play()
audioPlayer?.volume = 1.0
audioPlayer?.addObserver(self, forKeyPath: "currentItem.loadedTimeRanges", options: .new, context: nil)
let interval = CMTime(value: 1, timescale: 2)
audioPlayer?.addPeriodicTimeObserver(forInterval: interval, queue: DispatchQueue.main, using: { (progressTime) in
let currentTime = CMTimeGetSeconds(progressTime)
let currentTimeSecondsString = String(format: "%02d", Int(currentTime.truncatingRemainder(dividingBy: 60)))
let currentTimeMinutesString = String(format: "%02d", Int(currentTime / 60))
self.currentTimeLabel.text = "(currentTimeMinutesString):(currentTimeSecondsString)"
if let duration = self.audioPlayer?.currentItem?.duration {
let durationsSeconds = CMTimeGetSeconds(duration)
self.audioSlider.value = Float(currentTime / durationsSeconds)
}
})
}
}
override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
if keyPath == "currentItem.loadedTimeRanges" {
isAudioPlaying = true
if let duration = audioPlayer?.currentItem?.duration {
let seconds = CMTimeGetSeconds(duration)
let secondsText = Int(seconds) % 60
let minutesText = String(format: "%02d", Int(seconds) / 60)
audioLengthLabel.text = "(minutesText):(secondsText)"
}
}
}
@objc func handleSliderChange() {
if let duration = audioPlayer?.currentItem?.duration {
let totalSeconds = CMTimeGetSeconds(duration)
let value = Float64(audioSlider.value) * totalSeconds
let seekTime = CMTime(value: Int64(value), timescale: 1)
audioPlayer?.seek(to: seekTime, completionHandler: { (completedSeek) in
})
}
}
预期结果:听到音频播放
实际结果:听不到音频播放。似乎音频正在播放,只是没有声音。
使用 AVPlayer 时,您应该确保您的设备未处于静音模式,因为即使您的音量达到最大,这也会导致无法输出音频。
如果您想使设备保持静音模式并仍然播放音频,则可以在.play()之前使用以下代码:
do {
try? AVAudioSession.sharedInstance().setCategory(.playback, mode: .default, options: [])
}
catch {
// report for an error
print(error)
}