在iOS 3.2(iPad)中正确显示和关闭全屏MPMoviePlayerController

import MediaPlayer

var moviePlayer: MPMoviePlayerController?

func playVideo(url: URL) {
    moviePlayer = MPMoviePlayerController(contentURL: url)
    moviePlayer?.prepareToPlay()
    moviePlayer?.view.frame = view.bounds
    moviePlayer?.scalingMode = .aspectFit
    moviePlayer?.controlStyle = .fullscreen
    moviePlayer?.shouldAutoplay = true
    moviePlayer?.setFullscreen(true, animated: true)
    view.addSubview(moviePlayer!.view)
}

playVideo(url: URL(string: "https://example.com/video.mp4")!)

NotificationCenter.default.addObserver(self, selector: #selector(videoPlaybackDidFinish), name: .MPMoviePlayerPlaybackDidFinish, object: nil)

@objc func videoPlaybackDidFinish(notification: Notification) {
    if let reason = notification.userInfo?[MPMoviePlayerPlaybackDidFinishReasonUserInfoKey] as? Int {
        if reason == MPMovieFinishReason.playbackEnded.rawValue {
            moviePlayer?.setFullscreen(false, animated: true)
            moviePlayer?.stop()
            moviePlayer?.view.removeFromSuperview()
            moviePlayer = nil
        }
    }
}

deinit {
    NotificationCenter.default.removeObserver(self, name: .MPMoviePlayerPlaybackDidFinish, object: nil)
}