NSNotification，没有收到回调

Question

无法弄清楚为什么我没有得到回电 - 有什么建议吗？

-(void) playMovieWithURL:(NSURL *)url {

    [currentVC.view removeFromSuperview];

    MPMoviePlayerViewController *movieControl = [[MPMoviePlayerViewController alloc] initWithContentURL:url];

    //register for playback finished call
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(movieFinished:) name:MPMoviePlayerDidExitFullscreenNotification object:movieControl];

    [self presentMoviePlayerViewControllerAnimated:movieControl];       
}

-(void) movieFinished:(NSNotification *)aNotification {

    NSLog(@"received callback that movie finished");

    MPMoviePlayerController *movie = [aNotification object];

    [movie.view removeFromSuperview];

    [[NSNotificationCenter defaultCenter] removeObserver:self name:MPMoviePlayerDidExitFullscreenNotification object:movie];

    [movie release];

    [self.view addSubview:currentVC.view];      
}

Answer 1

狂野猜测，但也许你想要MPMoviePlayerPlaybackDidFinishNotification而不是MPMoviePlayerDidExitFullscreenNotification？

Answer 2

MPMoviePlayerController发布通知 MPMoviePlayerViewController不发布通知

所以我想在这种特殊情况下我会切换到使用MPMoviePlayerControllers。

Answer 3

我对MP API了解不多，但您正在以合理的方式注册通知。您确定MPMoviePlayerDidExitFullscreenNotification是您想要的通知吗？那（仅凭名称）似乎不等同于“电影完成”。