Queuing several video in AVQueuePlayer (for Playground)

QueuingVideoViewController.swift

import UIKit
import AVFoundation
import PlaygroundSupport

struct AVPlayerQueueBuilder {

    static func from(_ urls: [URL]) -> [AVPlayerItem] {
        return urls.map { return AVPlayerItem(url: $0) }
    }
}

class QueuingVideoViewController: UIViewController {

    let player: AVQueuePlayer = {
        let items = AVPlayerQueueBuilder.from(Settings.videoUrls)
        let player = AVQueuePlayer(items: items)
        return player
    }()

    lazy var playerLayer = AVPlayerLayer(player: player)

    enum Settings {

        static let screenW: CGFloat = 375
        static let playerHeight: CGFloat = Settings.screenW * (9/16)
        static let videoUrls = [
            URL(string: "http://download.appboomclap.co.kr/ad/ad_1.mp4")!,
            URL(string: "http://download.appboomclap.co.kr/ad/ad_1.mp4")!,
        ]
    }

    let playerView: UIView = {
        let view = UIView()
        view.translatesAutoresizingMaskIntoConstraints = false
        view.backgroundColor = .black
        return view
    }()

    override func viewDidLoad() {
        super.viewDidLoad()

        view.backgroundColor = .gray

        navigationItem.title = "QueuingVideo"
        navigationController?.navigationBar.isTranslucent = false

        view.addSubview(playerView)

        setupPlayerView()
        player.play()
    }

    private func setupPlayerView() {

        NSLayoutConstraint.activate([
            playerView.topAnchor.constraint(equalTo: view.topAnchor),
            playerView.leftAnchor.constraint(equalTo: view.leftAnchor),
            playerView.rightAnchor.constraint(equalTo: view.rightAnchor),
            playerView.heightAnchor.constraint(equalToConstant: Settings.playerHeight),
        ])

        playerView.layer.addSublayer(playerLayer)
    }

    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        playerLayer.frame = playerView.bounds
    }
}

let viewController = QueuingVideoViewController()
PlaygroundPage.current.liveView = viewController