Question

我想直接播放来自画廊的所有视频，但在此代码中，每次播放最后一段视频，我应该如何逐一播放所有视频

 ALAssetsLibrary* library = [[ALAssetsLibrary alloc] init];

    [library enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
        if (group) {
            [group setAssetsFilter:[ALAssetsFilter allVideos]];
            [group enumerateAssetsUsingBlock:^(ALAsset *asset, NSUInteger index, BOOL *stop){

                if (asset)
                {

                    NSDictionary *meta = [[asset defaultRepresentation] metadata];

                    if ([[asset valueForProperty:ALAssetPropertyType] isEqualToString:ALAssetTypeVideo]) {
                        // asset is a video
                        NSLog(@"See Asset: %@", asset);

                        self.moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:[[asset defaultRepresentation] url]];
                        if (self.moviePlayer != nil)
                        {
                            [self stopPlayingVideo:nil];
                        }
                        if (self.moviePlayer != nil)
                        {
                            [[NSNotificationCenter defaultCenter]
                             addObserver:self
                             selector:@selector(videoHasFinishedPlaying:)
                             name:MPMoviePlayerPlaybackDidFinishNotification
                             object:self.moviePlayer];
                            NSLog(@"Successfully instantiated the movie player.");
                            /* Scale the movie player to fit the aspect ratio */
                            self.moviePlayer.scalingMode = MPMovieScalingModeNone;
                            /* Let's start playing the video in full screen mode */
                            self.moviePlayer.view.frame = CGRectMake(100, 50, 650, 500);
                            [self.moviePlayer play];
                            //        [self.moviePlayer.view setFrame:self.view.bounds];
                            [self.view addSubview:self.moviePlayer.view];
                            [self.moviePlayer setFullscreen:NO
                                                   animated:YES];

                            volumeView = [[MPVolumeView alloc] initWithFrame:CGRectMake(-410, 300, 140, 52)] ;

                            [self.view addSubview:volumeView];


                            CGAffineTransform trans = CGAffineTransformMakeRotation(M_PI_2);
                            volumeView.transform = trans;


                            for (id current in volumeView.subviews) {
                                if ([current isKindOfClass:[UISlider class]]) {
                                    volumeSlider = (UISlider *)current;

                                    volumeSlider.minimumTrackTintColor = [UIColor grayColor];
                                    volumeSlider.maximumTrackTintColor = [UIColor whiteColor];


                                    volumeSlider.value = volumeSlider.maximumValue;
                                    [btnVol setBackgroundImage:[UIImage imageNamed:@"mx_vol.png"] forState:UIControlStateNormal];

                                }
                            }


                            [self.moviePlayer setControlStyle:MPMovieControlStyleNone];
                        } else {
                            NSLog(@"Failed to instantiate the movie player.");
                        }
                        [_moviePlayer setRepeatMode:MPMovieRepeatModeOne];

                    }

                    //                    NSLog(@"%@",asset);
                                        NSLog(@"%@",meta);

                }
            }];
        }
    } failureBlock:^(NSError *error) {
        NSLog(@"error enumerating AssetLibrary groups %@\n", error);
    }];

Answer 1

你正在枚举区内播放视频（这是一个循环的东西，它遍历你的所有视频并在最后一个停止，这就是为什么它只播放最后一个）。

您需要先检索视频的网址：

NSMutableArray  *videos  = [[NSMutableArray alloc] init];
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];

[library enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop)
 {
     if (group)
     {
         [group setAssetsFilter:[ALAssetsFilter allVideos]];
         [group enumerateAssetsUsingBlock:^(ALAsset *asset, NSUInteger index, BOOL *stop)
          {
              if (asset)
              {
                  NSURL  *videoURL = [[asset valueForProperty:ALAssetPropertyURLs] valueForKey:uti];
                  [videos addObject:videoURL];
              }
          }];
      }
 }
  failureBlock:^(NSError *error)
 {
     NSLog(@"error enumerating AssetLibrary groups %@\n", error);
 }];

现在您需要播放第一个视频并收听MPMoviePlayerPlaybackDidFinishNotification并开始播放下一个视频。

播放来自gallery ios的所有视频

1 个答案: