这很简单，而且可以完成工作!

import AVFoundation
var player: AVAudioPlayer!
            
    let url = Bundle.main.url(forResource: "sound_name", withExtension: "mp3")
     
    player = try! AVAudioPlayer(contentsOf: url!)
    player.play()

首先导入这些库

import AVFoundation

import AudioToolbox    

像这样设置委托

   AVAudioPlayerDelegate

在按钮动作或其他动作上写这样漂亮的代码:

guard let url = Bundle.main.url(forResource: "ring", withExtension: "mp3") else { return }
    do {
        try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback)
        try AVAudioSession.sharedInstance().setActive(true)
        player = try AVAudioPlayer(contentsOf: url, fileTypeHint: AVFileType.mp3.rawValue)
        guard let player = player else { return }

        player.play()
    }catch let error{
        print(error.localizedDescription)
    }

100%的工作在我的项目和测试

import UIKit
import AVFoundation

class ViewController: UIViewController{

    var player: AVAudioPlayer?

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @IBAction func notePressed(_ sender: UIButton) {

        guard let url = Bundle.main.url(forResource: "note1", withExtension: "wav") else { return }

        do {
            try AVAudioSession.sharedInstance().setCategory((AVAudioSession.Category.playback), mode: .default, options: [])
            try AVAudioSession.sharedInstance().setActive(true)


            /* The following line is required for the player to work on iOS 11. Change the file type accordingly*/
            player = try AVAudioPlayer(contentsOf: url, fileTypeHint: AVFileType.wav.rawValue)

            /* iOS 10 and earlier require the following line:
             player = try AVAudioPlayer(contentsOf: url, fileTypeHint: AVFileTypeMPEGLayer3) *//

            guard let player = player else { return }

            player.play()

        } catch let error {
            print(error.localizedDescription)
        }

    }

}

var soundEffect = AVAudioPlayer()

func playSound(_ buttonTag : Int){

    let path = Bundle.main.path(forResource: "note\(buttonTag)", ofType : "wav")!
    let url = URL(fileURLWithPath : path)

    do{
        soundEffect = try AVAudioPlayer(contentsOf: url)
        soundEffect?.play()
        // to stop the spound .stop()
    }catch{
        print ("file could not be loaded or other error!")
    }
}

工作在swift 4最新版本。ButtonTag是界面上按钮上的一个标签。笔记在与Main.storyboard平行的文件夹中的一个文件夹中。每个音符都被命名为note1、note2等。ButtonTag给出了被点击按钮的数字1、2等，并将其作为参数传递

Swift 4、4.2和5

播放来自URL和项目的音频(本地文件)

import UIKit
import AVFoundation

class ViewController: UIViewController{

var audioPlayer : AVPlayer!

override func viewDidLoad() {
        super.viewDidLoad()
// call what ever function you want.
    }

    private func playAudioFromURL() {
        guard let url = URL(string: "https://geekanddummy.com/wp-content/uploads/2014/01/coin-spin-light.mp3") else {
            print("error to get the mp3 file")
            return
        }
        do {
            audioPlayer = try AVPlayer(url: url as URL)
        } catch {
            print("audio file error")
        }
        audioPlayer?.play()
    }

    private func playAudioFromProject() {
        guard let url = Bundle.main.url(forResource: "azanMakkah2016", withExtension: "mp3") else {
            print("error to get the mp3 file")
            return
        }

        do {
            audioPlayer = try AVPlayer(url: url)
        } catch {
            print("audio file error")
        }
        audioPlayer?.play()
    }

}

Swift 4和iOS 12测试:

import UIKit
import AVFoundation
class ViewController: UIViewController{
    var player: AVAudioPlayer!
    override func viewDidLoad() {
        super.viewDidLoad()
    }

    func playTone(number: Int) {
        let path = Bundle.main.path(forResource: "note\(number)", ofType : "wav")!
        let url = URL(fileURLWithPath : path)
        do {
            player = try AVAudioPlayer(contentsOf: url)
            print ("note\(number)")
            player.play()
        }
        catch {
            print (error)
        }
    }

    @IBAction func notePressed(_ sender: UIButton) {
        playTone(number: sender.tag)
    }
}