在Swift项目的iOS中将MPMoviePlayerController全屏按钮图标更改为标题图标

import UIKit
import MediaPlayer

class ViewController: UIViewController {
    var moviePlayer: MPMoviePlayerController?
    var fullscreenButton: UIButton?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建MPMoviePlayerController
        let videoURL = URL(string: "https://example.com/video.mp4")
        moviePlayer = MPMoviePlayerController(contentURL: videoURL)
        
        // 设置MPMoviePlayerController的frame
        moviePlayer?.view.frame = CGRect(x: 0, y: 0, width: view.frame.width, height: view.frame.height)
        view.addSubview(moviePlayer!.view)
        
        // 创建全屏按钮
        fullscreenButton = UIButton(type: .custom)
        fullscreenButton?.frame = CGRect(x: 10, y: 10, width: 30, height: 30)
        fullscreenButton?.setImage(UIImage(systemName: "square.and.arrow.up"), for: .normal)
        fullscreenButton?.addTarget(self, action: #selector(fullscreenButtonTapped), for: .touchUpInside)
        view.addSubview(fullscreenButton!)
    }
    
    @objc func fullscreenButtonTapped() {
        moviePlayer?.fullscreen = !moviePlayer!.fullscreen
    }
}