是否更改SwiftUI中的AVPlayer源？

import SwiftUI
import AVKit

struct PlayerView: UIViewControllerRepresentable {
    let player: AVPlayer
    
    func makeUIViewController(context: Context) -> AVPlayerViewController {
        let playerViewController = AVPlayerViewController()
        playerViewController.player = player
        return playerViewController
    }
    
    func updateUIViewController(_ uiViewController: AVPlayerViewController, context: Context) {
        // No need to update the view controller in this example
    }
}

struct ContentView: View {
    @State private var player: AVPlayer?
    
    var body: some View {
        VStack {
            if let player = player {
                PlayerView(player: player)
                    .frame(height: 300)
            } else {
                Text("No player available")
            }
            
            Button("Change Source") {
                // Change the AVPlayer's source
                let newURL = URL(string: "https://example.com/new-video.mp4")!
                let newPlayerItem = AVPlayerItem(url: newURL)
                player?.replaceCurrentItem(with: newPlayerItem)
            }
        }
        .onAppear {
            let url = URL(string: "https://example.com/video.mp4")!
            let playerItem = AVPlayerItem(url: url)
            player = AVPlayer(playerItem: playerItem)
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}