我发现，在执行swift文件时无法播放音频的主要问题是：* 命令行工具在AVAudioPlayer准备好播放之前退出 *（在异步操作完成之前）。
这是我的解决方案（使用DispatchGroup），它可以通过从命令行工具（无Playground）执行我的Swift文件（用Swift 5.x编写）来播放我的mp3文件。

import Foundation
import AVFoundation

var testAudio = AVAudioPlayer()

let path = FileManager.default.currentDirectoryPath + "/example.mp3"

let url = URL(fileURLWithPath: path)

let group = DispatchGroup()
group.enter()

DispatchQueue.main.async {
    do {
        testAudio = try AVAudioPlayer(contentsOf: url)
    } catch let err {
        print("Failed play audio: \(err)")
    }

    group.leave()
}

group.notify(queue: .main) {
    print("play audio")
    testAudio.play()
}

dispatchMain()

试试这个，

import UIKit
import AVFoundation

class ViewController: AVAudioPlayerDelegate{
var audioPlayer: AVAudioPlayer!  // Declaring this outside your function, as class variable is important! otherwise your player won't be able to play the sound.

override func viewDidLoad() {
    super.viewDidLoad()
    self.playSound("/Users/mtwomey/Desktop/test1/test1/a2002011001-e02.wav")
}

func playSound(soundPath: String)
{
    let sound = NSURL(fileURLWithPath: soundPath)
    do{
        audioPlayer = try AVAudioPlayer(contentsOfURL: sound, fileTypeHint: "wav")
        audioPlayer.prepareToPlay()
        audioPlayer.delegate = self
        audioPlayer.play()
    }catch {
        print("Error getting the audio file")
    }
}

或（如果您已经将档案放置在项目中）（请遵循此blog post以了解如何将档案放置在项目中）

import UIKit
import AVFoundation

class ViewController: AVAudioPlayerDelegate{
var audioPlayer: AVAudioPlayer!  // Declaring this outside your function, as class variable is important! otherwise your player won't be able to play the sound.

override func viewDidLoad() {
    super.viewDidLoad()
    self.playSound("sound-name")
}

func playSound(soundName: String)
{
    let sound = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource(soundName, ofType: "wav")!)
    do{
        audioPlayer = try AVAudioPlayer(contentsOfURL: sound, fileTypeHint: "wav")
        audioPlayer.prepareToPlay()
        audioPlayer.delegate = self
        audioPlayer.play()
    }catch {
        print("Error getting the audio file")
    }
}