迭代視頻數組iOS

Question

我有一個URL擴展數組。目標是分段的：

1. 將擴展名添加到基本URL以創建特定視頻的URL。使用YTViewExtractor在MPMovieViewController

2. 播放視頻。

3. 重複用於在陣列下一URL擴展時MPMovieFinishReasonPlaybackEnded = TRUE或當下次按鈕被按下

這是迄今我的工作：

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]; 
          } 
         }]; 
} 

日誌：

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. 

日誌表明for循環遍歷所有元素的每個動作然後繼續執行循環中包含的下一個操作。

我有什麼是不能產生所需的輸出，我很感激任何反饋或建議。

Answer 1

由於影片的播放是一個異步事件，你的循環將通過之前的第一部電影纔剛剛開始，甚至（可能之前實際）執行的所有道路。您需要將代碼放入您在電影完成時調用的方法中，並使用計數器來跟蹤要選擇哪個網址而不是使用循環。

-(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++; 
    } 

} 

調用此方法來開始你的第一部電影，然後再調用它時，MPMoviePlayerPlaybackDidFinishNotification被調用。