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我MPMoviePlayerController用来播放音频/视频，并希望在应用程序背景和锁定屏幕出现时继续播放。我将 MPNowPlayingInfoCenter 的 nowPlayingInfo 设置viewDidLoad在UIApplicationWillResignActiveNotification1 个通知中，并使用以下内容：

- (void)appWillResignActive {
  NSMutableDictionary *nowPlayingInfo = [[NSMutableDictionary alloc] init];
  [nowPlayingInfo setObject:_session[@"session"][@"title"] forKey:MPMediaItemPropertyTitle];
  [nowPlayingInfo setObject:_session[@"session"][@"author"] forKey:MPMediaItemPropertyArtist];
  [nowPlayingInfo setObject:_session[@"session"][@"album"] forKey:MPMediaItemPropertyAlbumTitle];
  [nowPlayingInfo setObject:[NSNumber numberWithDouble:_videoController.playableDuration] forKey:MPMediaItemPropertyPlaybackDuration];
  [nowPlayingInfo setObject:@(1.0f) forKey:MPNowPlayingInfoPropertyPlaybackRate];
  [nowPlayingInfo setObject:[NSNumber numberWithDouble:_videoController.currentPlaybackTime] forKey:MPNowPlayingInfoPropertyElapsedPlaybackTime];

  if (_session[@"session"][@"album_art"] != nil) {
    UIImage *albumArtImage = [UIImage imageNamed:_session[@"session"][@"album_art"]];
    MPMediaItemArtwork *albumArt = [[MPMediaItemArtwork alloc] initWithImage:albumArtImage];
    [nowPlayingInfo setObject:albumArt forKey:MPMediaItemPropertyArtwork];
  }

  [[MPNowPlayingInfoCenter defaultCenter] setNowPlayingInfo:nowPlayingInfo];
}

锁定屏幕显示当前信息，但根本没有播放。经过的时间似乎正确，但总可玩时间不正确。按播放也不会启动它。我不确定出了什么问题，有什么想法吗？

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