video plays in wrong collection view cell - firebase

Question

I have a collection view that displays a video in each cell. It also contains a play button and an image which is displayed before the video is played. When I scroll up and down it theres no problem, but when I play a video it shows in the right cell but sometimes it also displays in another cell when I scroll down. I've tried using DispatchQueue(not sure if its the right thing to do) and that doesn't work so I'm stuck for ideas. I have another similar collection view that shows just images and it works perfectly but I'm having issues with this collection view because it displays videos instead. I've searched other questions but I can't find the answer I need to solve this issue. Help would much appreciated. Thanks in advance!
Collection view controller
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: homePostCellId, for: indexPath) as! videoListCollectionViewCell
cell.photoImageView.sd_setImage(with: URL(string: posts[indexPath.item].imageUrl!), placeholderImage: UIImage(named: “placeholder-image.png"))
let tapGesture : UITapGestureRecognizer = UITapGestureRecognizer.init(target: self, action: #selector(playVideo))
return cell
}
}
collection view Cell
class videoListCollectionViewCell: UICollectionViewCell {
var post: videoPost?
lazy var playButton: UIButton = {
let button = UIButton(type: .system)
button.translatesAutoresizingMaskIntoConstraints = false
let image = UIImage(named: "playButton7")
button.tintColor = UIColor.white
button.setImage(image, for: UIControlState())
button.addTarget(self, action: #selector(handlePlay), for: .touchUpInside)
return button
}()
lazy var asset: AVURLAsset = {
let videoUrlString = self.post?.videoUrl
let url = URL(string: videoUrlString!)
var asset: AVURLAsset = AVURLAsset(url: url!)
asset.resourceLoader.setDelegate(self, queue: DispatchQueue.main)
return asset
}()
var playerLayer: AVPlayerLayer?
var player: AVPlayer?
var observer:Any!
func handlePlay() {
// The video has been download already to the document directory
let filename = self.post?.postID
let path = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as String
let url = NSURL(fileURLWithPath: path)
let filePath = url.appendingPathComponent(filename!)?.path
let fileManager = FileManager.default
let RealURL = NSURL(fileURLWithPath: filePath!)
if fileManager.fileExists(atPath: filePath!) {
player = AVPlayer(url: RealURL as URL)
playerLayer = AVPlayerLayer(player: player)
playerLayer?.frame = photoImageView.bounds
photoImageView.layer.addSublayer(playerLayer!)
player?.play()
playButton.isHidden = true
print("Playing from saved disk")
NotificationCenter.default.addObserver(self, selector:#selector(self.playerDidFinishPlaying(note:)),name: NSNotification.Name.AVPlayerItemDidPlayToEndTime, object: player?.currentItem)
} else {
// The video hasn't been downloaded so it's loading from the URL
if let videoUrlString = post?.videoUrl, let url = URL(string: videoUrlString) {
player = AVPlayer(url: url)
playerLayer = AVPlayerLayer(player: player)
playerLayer?.frame = photoImageView.bounds
photoImageView.layer.addSublayer(playerLayer!)
player?.play()
activityIndicatorView.startAnimating()
playButton.isHidden = true
print("Attempting to play video")
self.observer = self.player?.addPeriodicTimeObserver(forInterval: CMTimeMake(1, 600), queue: DispatchQueue.main) {
[weak self] time in
if self?.player?.currentItem?.status == AVPlayerItemStatus.readyToPlay {
if (self?.player?.currentItem?.isPlaybackLikelyToKeepUp) != nil {
self?.activityIndicatorView.stopAnimating()
}
}
}
NotificationCenter.default.addObserver(self, selector:#selector(self.playerDidFinishPlaying(note:)),name: NSNotification.Name.AVPlayerItemDidPlayToEndTime, object: player?.currentItem)
}
}
}
func playerDidFinishPlaying(note: NSNotification){
print("Video Stopped”)
self.player?.pause()
playButton.isHidden = false
let exporter = AVAssetExportSession(asset: asset, presetName: AVAssetExportPresetHighestQuality)
let filename = self.post?.postID
let documentsDirectory = FileManager.default.urls(for: FileManager.SearchPathDirectory.documentDirectory, in: FileManager.SearchPathDomainMask.userDomainMask).last!
let archiveURL = documentsDirectory.appendingPathComponent(filename!)
exporter?.outputURL = archiveURL
exporter?.outputFileType = AVFileTypeMPEG4
let path = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as String
let url = NSURL(fileURLWithPath: path)
let filePath = url.appendingPathComponent(filename!)?.path
let fileManager = FileManager.default
if fileManager.fileExists(atPath: filePath!) {
} else {
exporter?.exportAsynchronously(completionHandler: {
print(exporter?.status.rawValue)
print(exporter?.error)
})
}
}