在UICollectionView上使用AVPlayer和AVPlayerLayer显示多个视频

我正在使用带有水平滚动的UICollectionView Cell上的AVPlayer和AVPlayerLayer类在全屏幕上显示“n”个视频的应用程序 . 我在UIScrollView上启用了set paging . 因为我只需要播放当前位置播放器，否则“上一个和下一个”小区播放器应该处于“暂停”状态 .

我正在以url格式获取视频 . 所以最初我需要下载，之后它将开始播放 . 因此，每个人都不需要从URL下载视频 . 所以我决定将下载的视频缓存在本地 . 所以我下载并将其存储在本地文件中 . 然后我从本地加载视频如果它存在于本地文件中 .

问题：

（一个） . “播放和暂停”在相关索引上无法正常工作 . 最初“0”指数被播放 . 当我滚动到下一个索引此时应该正在播放当前的索引播放器时，下一个索引播放器应该处于“暂停”状态 . 它没有正确同步 .

（b）中 . 我可以看到之前的播放器视频片段，直到下一个播放器开始播放 .

（C） . 所有观看的音频同时在后台播放以及释放播放器时也是如此 . （我的意思是，我可以在驳回一些观点或查看控制器之后听到）

（d）需要保持内存泄漏问题 .

我在下面尝试了源代码的方式，

- (void)setVideoLoading:(NSString *)videoUrl{

    NSString *urlString = videoUrl;

    SHAREDATA.videoUrl = [NSURL URLWithString:urlString];

    AVURLAsset *asset = [AVURLAsset URLAssetWithURL:SHAREDATA.videoUrl options:nil];

    NSArray *requestedKeys = @[@"playable"];

    //Tells the asset to load the values of any of the specified keys that are not already loaded.
    [asset loadValuesAsynchronouslyForKeys:requestedKeys completionHandler:^{

        dispatch_async(dispatch_get_main_queue(), ^{

            AVPlayerItem *item = [AVPlayerItem playerItemWithAsset: asset];

            if (self.avPlayer)
            {
                /* Remove existing player item key value observers and notifications. */

                [self.avPlayer removeObserver:self forKeyPath:@"status" context:nil];

                [[NSNotificationCenter defaultCenter] removeObserver:self
                                                                name:AVPlayerItemDidPlayToEndTimeNotification
                                                              object:self.avPlayer.currentItem];
            }

            self.avPlayer = [AVPlayer playerWithPlayerItem:item];

            self.avPlayerLayer = [AVPlayerLayer playerLayerWithPlayer:self.avPlayer];

            if (_typeOfContentMode == UIViewContentModeScaleAspectFit) {

                self.avPlayerLayer.videoGravity = AVLayerVideoGravityResizeAspect;
            }
            else if (_typeOfContentMode == UIViewContentModeScaleAspectFill)
            {
                self.avPlayerLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
            }


            self.avPlayerLayer.frame = CGRectMake(0, 0, _videoBackgroundView.frame.size.width, _videoBackgroundView.frame.size.height);

            [_videoBackgroundView.layer addSublayer:self.avPlayerLayer];

            self.avPlayer.actionAtItemEnd = AVPlayerActionAtItemEndNone;

            self.avPlayer.muted = NO;

            [self.avPlayer addObserver:self
                                forKeyPath:@"status"
                                   options:NSKeyValueObservingOptionInitial | NSKeyValueObservingOptionNew
                                   context:nil];
        });
    }];

下面是KVO方法 .

- (void)observeValueForKeyPath:(NSString *)keyPath
                      ofObject:(id)object
                        change:(NSDictionary *)change
                       context:(void *)context {

    if (object == self.avPlayer && [keyPath isEqualToString:@"status"]) {

        if (self.avPlayer.status == AVPlayerStatusReadyToPlay) {

            [_videoProgressView setProgress:0 animated:NO];

            [self setVideoPlayEnabled];

            [self setAutoUpdateTimer];

            [[NSNotificationCenter defaultCenter] removeObserver:self name:AVPlayerItemDidPlayToEndTimeNotification object:[self.avPlayer currentItem]];

            [[NSNotificationCenter defaultCenter] addObserver:self
                                                     selector:@selector(playerItemDidReachEnd:)
                                                         name:AVPlayerItemDidPlayToEndTimeNotification
                                                       object:[self.avPlayer currentItem]];
        }
        else if (self.avPlayer.status == AVPlayerStatusFailed ||
                 self.avPlayer.status == AVPlayerStatusUnknown) {

            [SVProgressHUD dismiss];

            if (self.avPlayer.rate>0 && !self.avPlayer.error)
            {
                [self.avPlayer setRate:0.0];

                [self.avPlayer pause];
            }
        }
    }
}

- (void)playerItemDidReachEnd:(NSNotification *)notification {

    [SVProgressHUD dismiss];

    AVPlayerItem *p = [notification object];

    [p seekToTime:kCMTimeZero completionHandler:^(BOOL finished)
     {             
         [self.avPlayer play];
     }];
}

我从“cellForItemAtIndexPath”传递url，我将当前播放器暂停在“didEndDisplayingCell”上 .

然后在“scrollViewDidEndDecelerating”中，我刚检查了我的customCell类的其他全局实例（在全局变量上声明）并暂停该单元格当前播放器 .

但主要目的是scrollViewDidEndDecelerating，我正在获得当前可见的单元格 .

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    if (self.lastPlayingCell) {

        [self.lastPlayingCell.avPlayer pause];
    }

    // Play/Pause Video
    CGRect visibleRect = (CGRect){.origin = self.videoCollectionView.contentOffset, .size = self.videoCollectionView.bounds.size};

    CGPoint visiblePoint = CGPointMake(CGRectGetMidX(visibleRect), CGRectGetMidY(visibleRect));

    _visibleIndexPath = [self.videoCollectionView indexPathForItemAtPoint:visiblePoint];

    DetailsCollectionCell *cell = (DetailsCollectionCell *)[self.videoCollectionView cellForItemAtIndexPath:_visibleIndexPath];

    if (![cell isEqual: self.lastPlayingCell]) {

        [self.avPlayer play];

        self.lastPlayingCell = cell;//assigned to current visible cell to lastplayingcell instance. 
    }
}

我在这里告知一件事，我只是将AVPlayer显示为UIView类的子视图 . 当我点击视频拇指图像（UITableView上发布的视频信息列表的前一个视图）时，我的意思是UITable选择功能，我只是显示UIView移动它的“Y”位置值（就像现在的视图控制器一样） .

所以我可以在“Facebook messanger app camera access view”中移动该视图“Top＆down”方向 .

因此，当我关闭视图时，我需要释放AVPlayer，在所有已观看视频的背景上停止音频并删除已注册的观察者类，如下所示 .

- (void)setRemoveRegisteredObserversAndPlayerRelatedElements
{
    [self.avPlayer removeObserver:self forKeyPath:@"status" context:nil];

    [[NSNotificationCenter defaultCenter] removeObserver:self name:AVPlayerItemDidPlayToEndTimeNotification object:[self.avPlayer currentItem]];

    [self.avPlayerLayer.player pause];

    [self.avPlayer pause];

    self.avPlayer = [AVPlayer playerWithURL:[NSURL URLWithString:@""]];

    [self.avPlayerLayer removeFromSuperlayer];

    self.avPlayerLayer.player = nil;

    self.avPlayerLayer = nil;

    self.avPlayer = nil;
}

任何想法解决这些问题并在当前索引上顺利播放视频，停止音频并处理内存泄漏 .

任何人分享或提出一些建议来实现这一目标 .

cellForItemAtIndexPath

- (UICollectionViewCell *) collectionView: (UICollectionView *) collectionView cellForItemAtIndexPath: (NSIndexPath *) indexPath
{
    videoDetailsCollectionCell *videoDetailCell = [collectionView dequeueReusableCellWithReuseIdentifier:kVideoDetailsCollectionCell forIndexPath:indexPath];

    NSDictionary *publishedVideoObject = [self.videoDetailArray objectAtIndex:indexPath.row];

    [videoDetailCell loadVideoURL:publishedVideoObject];

    return videoDetailCell;
}

我已经添加了ZOWVideoPlayer库文件中的所有类文件 .

Latest Edit:

#pragma mark - Load video url for their current index cell
- (videoDetailsCollectionCell *)videoCellFor:(UICollectionView *)collectionView withIndex:(NSIndexPath *)indexPath
{
    videoDetailsCollectionCell * videoCell = [collectionView dequeueReusableCellWithReuseIdentifier:kCustomVideoCell forIndexPath:indexPath];

    //[videoCell.videoView.videoPlayer resume];

    return videoCell;
}

在CellForItemAtIndexPath方法中

NSDictionary *publicationObject = [videoDetailArray objectAtIndex:indexPath.row];

    videoDetailsCollectionCell * cell = [self videoCellFor:collectionView withIndex:indexPath];

    cell.mediaUrl = [NSString replaceEmptyStringInsteadOfNull:[NSString stringWithFormat:@"%@",publicationObject.video]];

    return cell;

然后在 scrollViewDidScroll ，如前所述，我是 Pause last played videos .

然后在 scrollViewDidEndDecelerating 我跟随下面的答案部分，除了使用 UICollectionView 而不是 IndexedCollectionView 类来检索页面计数信息 .

最后我停止了所有播放的视频如下，

- (void)setPauseTheLastViewedPlayerAudio {

        // Pause last played videos
        if (self.lastPlayedVideo) {

            [self.lastPlayedVideo mute];

            [self.lastPlayedVideo stopVideoPlay];
        }

        _videoDetailArray = nil;

        [_videoCollectionView reloadData];
    }

因为我应该使用 UIPanGestureRecognizer 来解除用手指从上到下移动的玩家视图 .