ios - 视频不工作 视频崩溃了

Question

我的应用程序崩溃了，我已经看过所有教程，但它一直崩溃。有什么问题？我使用情节提要，然后连接按钮，就是这样。它崩溃了

- (IBAction)playMove;
{
    NSURL *url =[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"1" ofType:@"mp4"]];
    MPMoviePlayerViewController *player = [[MPMoviePlayerViewController alloc]initWithContentURL:url];
    [self presentMoviePlayerViewControllerAnimated:player];
    player.moviePlayer.movieSourceType = MPMovieSourceTypeFile;
    [player.moviePlayer play];
    player =nil;
}