I'm working on an app to play multiple mp3 files simultaneously - I'm kind of there but I can't get the audio to loop. I really didn't think this wouuld be the hardest part of the code, does anyone have any pointers? Everything I try just crashes or fails.

Here is where I am (this took me so long to just get this far!)

import SwiftUI
import AVFoundation
import AVKit

struct ContentView: View {
    // Declare  audio players
    let player1 = AVPlayer()

    // Load the MP3 files into the players
    func loadFiles() {
        // Declare path to audio file - duplicate for each file
        let file1 = Bundle.main.path(forResource: "heavyrain", ofType: "mp3") ?? ""
        let file1URL = URL(fileURLWithPath: file1)
        let playerItem1 = AVPlayerItem(url: file1URL)
        player1.replaceCurrentItem(with: playerItem1)

    }

    // Declare variables to store the volume levels for each player
    @State private var player1Volume: Float = 1.0
    @State private var isPlaying = false

    var body: some View {
        VStack {
            // Create audio controller - duplicate for each player
            VStack {
                HStack {
                    Text("Heavy rain")
                    Spacer()
                    Button(action: {
                                       if self.isPlaying {
                                           self.player1.pause()
                                           self.isPlaying = false
                                       } else {
                                           self.player1.play()
                                           self.isPlaying = true
                                       }
                                   }) {
                                       if isPlaying {
                                           Image(systemName: "stop.fill")
                                       } else {
                                           Image(systemName: "play.fill")
                                       }
                                   }
                    //Slider to control the volume of player
                    Slider(value: $player1Volume, in: 0...1, step: 0.1) {
                        Text("Player 1 Volume")
                    }
                    .onReceive([self.player1Volume].publisher.first()) { value in
                        self.player1.volume = value
                    }
                }
            }
        }
        .padding()
        .onAppear(perform: loadFiles)
    }
}

Have a look here: https://developer.apple.com/documentation/avfaudio/avaudioplayer/1386071-numberofloops

and accordingly I guess you should add to your code the below

func loadFiles() {
        // Declare path to audio file - duplicate for each file
        let file1 = Bundle.main.path(forResource: "heavyrain", ofType: "mp3") ?? ""
        let file1URL = URL(fileURLWithPath: file1)
        let playerItem1 = AVPlayerItem(url: file1URL)
        player1.replaceCurrentItem(with: playerItem1)
        player1.numberOfLoops = -1

    }

Thank you, I changed from AVPlayer to AVAudioPlayer and now can use the numberOfLoops option. Weirdly AVPlayer doesnt have the loop ability.