音频无法在设备上运行。适用于模拟器

Question

我创建了一个Sound类，并在我的场景文件中放置了一个方法，以便在视图开始时调用音频。

我还在构建阶段链接了AudioToolbox.framework。

所有在我的模拟器上运行正常，但声音在实际设备上无法播放。

static let sharedInstance = Sound()

private let music = "filename.mp3"

private var player = AVAudioPlayer()
private var initialized = false

func playMusic() {
    let url = URL(fileURLWithPath: Bundle.main.path(forResource: "filename", ofType: nil)!)

    do {
        player = try AVAudioPlayer(contentsOf: url)
    } catch let error as NSError {
        NSLog("Error playing music: %@", error)
    }

    player.numberOfLoops = -1
    player.prepareToPlay()
    player.play()

    initialized = true

}