Add and remove observer from multiple AVPlayerItem on UITableViewCell

Question

i am trying to make a table view that plays multiple videos with AVPlayer and AVPlayerItem and i needed to addObserver to each AVPlayerItem

Answer 1

So the best solution that ever worked for me is to subclass the AVPlayerItem and use protocol to delegate back to any class that conforms to AMPlayerItemDelegate

here is how i did it

protocol AMPlayerItemDelegate {
    func playbackLikelyToKeepUp()
}

class AMPlayerItem: AVPlayerItem {

   var delegate : MyPlayerItemDelegate?

   init(URL: NSURL) {
       super.init(asset: AVAsset(URL: URL) , automaticallyLoadedAssetKeys:[])
       self.addMyObservers()
   }

   deinit {
       self.removeMyObservers()
   }

   func addMyObservers() {
       print("Adding")
       self.addObserver(self, forKeyPath: "playbackLikelyToKeepUp", options: [.New], context: nil)
   }

   func removeMyObservers() {
       print("Removing")
       self.removeObserver(self, forKeyPath: "playbackLikelyToKeepUp", context: nil)
   }

   override func observeValueForKeyPath(keyPath: String?, ofObject object: AnyObject?, change: [String : AnyObject]?, context: UnsafeMutablePointer<Void>) {
       if keyPath == "playbackLikelyToKeepUp" {
           self.delegate?.playbackLikelyToKeepUp()
       }
   }

}

Answer 2

Try to override 'prepareForReuse' function in your UITableViewCell subclass, and remove observer in that place.

override func prepareForReuse() {
    super.prepareForReuse()

    //remove observer here...
}