iPadSwiftPlaygroundsPlayAudioSwiftUI.swift

import AVFoundation
import SwiftUI
import PlaygroundSupport

struct SwiftUIAudioPlayerView: View {
    
    /// the player that will play the audio. It can't be a local variable.
    /// Must have the `@State` attribute, because we need modify it later on
    @State var audioPlayer: AVAudioPlayer?
    
    /// the path for the audio. 'forResource' is the name of the file. 'withExtension' is the file format.
    let audioURL = Bundle.main.url(forResource: "intro", withExtension: "mp3") 
    
    var body: some View {
        Button(action: {
            self.playAudio() /// play audio when pressed
        }) {
            Text("Play Audio!") /// what the button looks like
        }
    }

    /// function to play the audio
    func playAudio() {
        /// `audioURL` is an optional, so we need to unwrap it
        if let musicPath = audioURL {
            
            /// making an AVAudioPlayer can throw an error, so we wrap it in a do-catch block
            do {
                try self.audioPlayer = AVAudioPlayer(contentsOf: musicPath)
                self.audioPlayer?.numberOfLoops = -1 /// infinite loop
                self.audioPlayer?.play()
            } catch {
                print("Couldn't play audio. Error: \(error)")
            }
        } else {
            print("No audio file found")
        }
    }
}

let audioPlayerView = SwiftUIAudioPlayerView()
PlaygroundPage.current.setLiveView(audioPlayerView)