experiment-weak-or-strong-self-capture

PlayerViewController.swift

//
//  PlayerViewController.swift
//  Player
//
//  Created by Maris Lagzdins on 12/01/2022.
//

import UIKit

class PlayerViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()

        let player = Player()
        player.onReadyToPlay = {
            print("Player is ready to play.")
        }
        player.download()

        print("Player view did load.")
    }
}

struct DataLoader {
    func asyncLoad(closure: @escaping (Data) -> Void) {
        // asynchronously loads data.
    }
}

class Player {
    private let loader = DataLoader()
    private let queue = DispatchQueue(label: "Player.Process.Queue")

    var onReadyToPlay: (() -> Void)?

    func play() {
        print("Play player.")
    }

    func download() {
        queue.async { [weak self] in
            guard let self = self else { return }

            print("Download the audio.")

            self.loader.asyncLoad { data in

                print("Prepare the audio for playback.")

                self.onReadyToPlay?()
            }
        }
    }
}