Continuous loop playback on AVAudioPlayer make memory leak?

Sorry. I forgot attaching my code. 　

VIEW

import SwiftUI

struct ContentView: View {
   
  let apm = AudioPlayManager()
   
  var body: some View {
    Button(action: {
      self.apm.startPlayAudio(){ audioMangeCompletion in 
        print("play is finished")
      }
    }, label: {
      Text("Push")
    })
  }
}

AudioPlayManager

import SwiftUI
import AVFoundation


public class AudioPlayManager{
   
  let items:[String] = ["sound01", "sound02", "sound03"]
  let isLoopPlay = true
  var playingIndex = 0
   
  let apm = AudioPlayFunction.shared
   
  func startPlayAudio(completion: @escaping (Bool) -> Void){
     
    playAudio() { isAudioPlayComplete in
      completion(true)
    }
  }
   
  private func playAudio(completion: @escaping (Bool) -> Void){
    let i = playingIndex
     
    print("i: \(i) items.count: \(items.count)")
     
    if(i >= items.count && isLoopPlay){
      playingIndex = 0
      let fileURL = URL(fileURLWithPath: Bundle.main.path(forResource: items[0], ofType: "mp3") ?? "")
      print("fileURL: \(fileURL)")
      apm.playMP3(url: fileURL){ playMP3complete in
        self.playingIndex += 1
        self.playAudio() { playAudioCompletion in
          completion(true)
        }
      }
    } else {
      let fileURL = URL(fileURLWithPath: Bundle.main.path(forResource: items[i], ofType: "mp3") ?? "")
      print("fileURL: \(fileURL)")
      apm.playMP3(url: fileURL){ playMP3complete in
        self.playingIndex += 1
        self.playAudio() { playAudioCompletion in
          completion(true)
        }
      }
    }
  }
   
}

AudioPlayFunction

import Foundation
import AVFoundation

class AudioPlayFunction: NSObject, AVAudioPlayerDelegate {
  static let shared = AudioPlayFunction()
   
  var audioPlayer: AVAudioPlayer?
  private var observer: NSObjectProtocol?
   
  override init() {
    super.init()
  }
   
  func playMP3(url: URL, completion: @escaping (Bool) -> Void){
    do {
      print("url: \(url)")
      audioPlayer = try AVAudioPlayer(contentsOf: url, fileTypeHint: AVFileType.mp3.rawValue)
      audioPlayer?.delegate = self
      audioPlayer?.play()
      print("sound is playing")
    } catch let error {
      print("Sound Play Error -> \(error)")
    }
     
    if(observer == nil){
      print("create observer")
      observer = NotificationCenter.default.addObserver(forName: NSNotification.Name("audioStatus"), object: nil, queue: .main){ (_) in
         
        let speechStatus = UserDefaults.standard.value(forKey: "audioStatus") as? Bool ?? false
         
        if speechStatus {
          print("audio completion signal is received")
          completion(true)
        }
         
      }
    }
     
  }
       
  func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool) {
    print("Audio Play Stop ")
    UserDefaults.standard.set(true, forKey: "audioStatus")
    NotificationCenter.default.post(name:NSNotification.Name("audioStatus"), object: nil)
  }
   
  public func stopSpeech(){
    self.audioPlayer?.stop()
     
    print("User stop audio play")
    UserDefaults.standard.set(true, forKey: "audioStatus")
    NotificationCenter.default.post(name:NSNotification.Name("audioStatus"), object: nil)
     
  }
}

Thanks

I solved this problem. This audioplayback design was not good. Recursive call increase memory. So, I find out another design approach. Dependency Injection. And, then memory problem has been solved!