视频无法正常运行视频崩溃

Question

我的应用程序崩溃我看到了所有教程，但它一直崩溃。 什么是问题？ 我使用故事板，然后连接按钮就可以了。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;
}