ios - 迭代视频数组 iOS

Question

我有一组 URL 扩展。目标是分段的:

1. 将扩展名添加到基本网址以创建特定视频的网址。

2. 使用 YTViewExtractor 在 MPMovieViewController 中播放视频。

3. 当 MPMovieFinishReasonPlaybackEnded = TRUE 或按下下一个按钮时，重复数组中的下一个 URL 扩展

这是我迄今为止的工作:

int i;
for (i=0; i < [_uriToBeAppended count]; i++)
{

    NSString *uriString = [_uriToBeAppended  objectAtIndex:i];
    NSString *urlString = [NSString stringWithFormat:@"http://vimeo.com/%@", uriString];

    NSLog(@"URL String: %@", urlString);

    [YTVimeoExtractor fetchVideoURLFromURL:urlString
                                   quality:YTVimeoVideoQualityMedium
                         completionHandler:^(NSURL *videoURL, NSError *error, YTVimeoVideoQuality quality) {
                             if (error) {
                                 // handle error
                                 NSLog(@"Video URL: %@", [videoURL absoluteString]);
                             } else {
                                 // run player
                                 self.moviePlayer = [[MPMoviePlayerViewController alloc] initWithContentURL:videoURL];
                                 [self.moviePlayer.moviePlayer prepareToPlay];
                                 [self presentViewController:self.moviePlayer animated:YES completion:nil];
                             }
                         }];
}

日志:

    2014-10-11 22:30:05.528 Voulette[668:162653] URL String: http://vimeo.com/96558506
.
.
2014-10-11 22:30:05.577 Voulette[668:162653] URL String: http://vimeo.com/6615855



2014-10-11 22:30:06.997 Voulette[668:162653] -[UIApplication beginIgnoringInteractionEvents] overflow. Ignoring.
.
.
2014-10-11 22:30:09.700 Voulette[668:162653] -[UIApplication beginIgnoringInteractionEvents] overflow. Ignoring.



2014-10-11 22:30:10.063 Voulette[668:162653] -[UIApplication endIgnoringInteractionEvents] called without matching -beginIgnoringInteractionEvents. Ignoring.
.
.
2014-10-11 22:30:10.189 Voulette[668:162653] -[UIApplication endIgnoringInteractionEvents] called without matching -beginIgnoringInteractionEvents. Ignoring.



2014-10-11 22:30:11.519 Voulette[668:162653] Warning: Attempt to present <MPMoviePlayerViewController: 0x1568fcd0> on <ViewController: 0x1554e3e0> whose view is not in the window hierarchy!
.
.
2014-10-11 22:30:11.729 Voulette[668:162653] Warning: Attempt to present <MPMoviePlayerViewController: 0x16818810> on <ViewController: 0x1554e3e0> whose view is not in the window hierarchy!



2014-10-11 22:30:11.739 Voulette[668:162653] -[UIApplication beginIgnoringInteractionEvents] overflow. Ignoring.
2014-10-11 22:30:11.742 Voulette[668:162653] Warning: Attempt to present <MPMoviePlayerViewController: 0x1681d690> on <ViewController: 0x1554e3e0> whose view is not in the window hierarchy!
.
.
2014-10-11 22:30:11.887 Voulette[668:162653] -[UIApplication beginIgnoringInteractionEvents] overflow. Ignoring.
2014-10-11 22:30:11.903 Voulette[668:162653] Warning: Attempt to present <MPMoviePlayerViewController: 0x157b1e70> on <ViewController: 0x1554e3e0> whose view is not in the window hierarchy!



2014-10-11 22:30:12.674 Voulette[668:162653] -[UIApplication endIgnoringInteractionEvents] called without matching -beginIgnoringInteractionEvents. Ignoring.
.
.
2014-10-11 22:30:12.699 Voulette[668:162653] -[UIApplication endIgnoringInteractionEvents] called without matching -beginIgnoringInteractionEvents. Ignoring.

日志表明 for 循环在继续执行循环中包含的下一个操作之前，会遍历数组中所有元素的每个操作。

我所拥有的并没有产生所需的输出，我很感激任何反馈或建议。

Answer 1

由于电影的播放是一个异步事件，您的循环将在第一部电影几乎还没有开始之前(可能在实际之前)一直执行。您需要将代码放在电影播放结束时调用的方法中，并使用计数器来跟踪要选择的 url，而不是使用循环。

-(void)playNextMovie {
    static int i = 0;
    if (i < _uriToBeAppended.count) {
        NSString *uriString = [_uriToBeAppended  objectAtIndex:i];
        NSString *urlString = [NSString stringWithFormat:@"http://vimeo.com/%@", uriString];

        NSLog(@"URL String: %@", urlString);

        [YTVimeoExtractor fetchVideoURLFromURL:urlString
                                   quality:YTVimeoVideoQualityMedium
                         completionHandler:^(NSURL *videoURL, NSError *error, YTVimeoVideoQuality quality) {
                             if (error) {
                                 // handle error
                                 NSLog(@"Video URL: %@", [videoURL absoluteString]);
                             } else {
                                 // run player
                                 self.moviePlayer = [[MPMoviePlayerViewController alloc] initWithContentURL:videoURL];
                                 [self.moviePlayer.moviePlayer prepareToPlay];
                                 [self presentViewController:self.moviePlayer animated:YES completion:nil];
                             }
                         }];
        i++;
    }

}

调用此方法来开始您的第一部电影，然后在调用 MPMoviePlayerPlaybackDidFinishNotification 时再次调用它。