如何在其他视图中使用Swift中的AVPlayer暂停和播放音乐

import AVFoundation

class PlayerManager {
    static let shared = PlayerManager()
    private init() {}
    
    var player: AVPlayer?
    
    func play(url: URL) {
        let playerItem = AVPlayerItem(url: url)
        player = AVPlayer(playerItem: playerItem)
        player?.play()
    }
    
    func pause() {
        player?.pause()
    }
}

class FirstViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 播放音乐
        if let musicURL = URL(string: "https://example.com/music.mp3") {
            PlayerManager.shared.play(url: musicURL)
        }
    }
    
    @IBAction func pauseButtonTapped(_ sender: UIButton) {
        // 暂停音乐
        PlayerManager.shared.pause()
    }
}

class SecondViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 这里也可以控制音乐播放，因为使用的是同一个单例实例
    }
    
    @IBAction func playButtonTapped(_ sender: UIButton) {
        // 继续播放音乐
        PlayerManager.shared.player?.play()
    }
}