sorting - AVPlayer not working correct w/ my array - swift -

i have ui collection retrieves data camera roll load videos collection. attempting when select video in collection, play in custom uiview avplayer; works great, except when play video not play correct video in array have appended video urls in to. play random video library , crash app pointing appending video urls , saying "fatal out of range". can't seem figure out why occurring. correctly printing out values of array count; think has how retrieving video.

here fetching video:

 let requestoptions = phimagerequestoptions() requestoptions.issynchronous = true requestoptions.deliverymode = .highqualityformat  let fetchoptions = phfetchoptions() fetchoptions.sortdescriptors = [nssortdescriptor(key: "creationdate", ascending: false)] if let fetchresult : phfetchresult = phasset.fetchassets(with: .video, options: fetchoptions) {     if fetchresult.count > 0 {         in 0..<fetchresult.count{              //used fetch image//             imgmanager.requestimage(for: fetchresult.object(at: i) phasset , targetsize: cgsize(width: 200, height: 200), contentmode: .aspectfit, options: requestoptions, resulthandler: {                 image, error in                 let imageofvideo = image! uiimage                 self.imagearray.append(imageofvideo)             })             //used fetch video//             imgmanager.requestavasset(forvideo: fetchresult.object(at: i) phasset, options: phvideorequestoptions(), resulthandler: {(avasset, audiomix, info) -> void in                 if let asset = avasset as? avurlasset {                     let videodata = nsurl(string: "\(asset.url)")                     let duration : cmtime = asset.duration                     let durationinsecond = cmtimegetseconds(duration)                     print(durationinsecond)                     self.videoarray.append(videodata!)                     print(self.videoarray)                 }              })         }      }     else{         //showallerttoimportimage()//a function show alert     } } } 

the loading of each cell -> don't think matter though

     func collectionview(_ collectionview: uicollectionview, cellforitemat indexpath: indexpath) -> uicollectionviewcell {     let cell = collectionview.dequeuereusablecell(withreuseidentifier: cellid, for: indexpath) as! videoselectioncvcell      cell.uploadedfile.image = imagearray[indexpath.row]     return cell } 

the didselect: ->> think issue is

func collectionview(_ collectionview: uicollectionview, didselectitemat indexpath: indexpath) {     displayview.frame = cgrect(x: self.view.frame.size.width / 2, y: self.view.frame.size.height / 2, width:self.view.frame.size.width / 1.15, height: self.view.frame.size.height / 1.3)     displayview.center = view.center     displayview.backgroundcolor = uicolor.clear     displayview.layer.cornerradius = displayview.layer.frame.size.width / 10     displayview.layer.bordercolor = uicolor.black.cgcolor     displayview.layer.borderwidth = 4     //displayview.avplayerlayer.cornerradius = displayview.avplayerlayer.frame.size.width/10     displayview.url = videoarray[indexpath.row] } 

the count

func collectionview(_ collectionview: uicollectionview, numberofitemsinsection section: int) -> int {     return imagearray.count } 

the custom player:

class videoplayback: uiview {  var url: nsurl! var avplayer: avplayer! var avplayerlayer: avplayerlayer! var cancelbutton: uibutton!  // empty implementation adversely affects performance during animation. override func draw(_ rect: cgrect) {      self.backgroundcolor = uicolor.black      avplayer = avplayer(url: url! url)     avplayer.actionatitemend = avplayeractionatitemend.none     avplayerlayer = avplayerlayer(player: avplayer)      notificationcenter.default.addobserver(self, selector: #selector(playeritemdidreachend(_:)), name: nsnotification.name.avplayeritemdidplaytoendtime, object: avplayer.currentitem)       avplayerlayer.frame = cgrect(x: 0, y: 0, width: self.frame.width, height: self.frame.height)     //avplayerlayer.frame = self.layer.bounds     self.layer.addsublayer(avplayerlayer)     avplayer.play()   }  func playeritemdidreachend(_ notification: notification) {     let playeritem = notification.object as! avplayeritem     playeritem.seek(to: kcmtimezero) } } 

here full collection view class in case.

https://paste.ee/p/jgzsu

again, think has how appending , retrieving videos.

instead of having 2 arrays, believe safer create small class or struct (i.e. media) hold image , video , create media array use collection view. because 2 methods fetching asynchronous never know index video/image combo assigned to. also, try nesting async calls same media instance used both calls keep data consistency.

here non tested example:

struct media {     var image:uiimage?     var videourl:url? }  var mediaarray = [media]()  in 0..<fetchresult.count{     let mediaitem = media()     //used fetch image//     imgmanager.requestimage(for: fetchresult.object(at: i) phasset , targetsize: cgsize(width: 200, height: 200), contentmode: .aspectfit, options: requestoptions, resulthandler: {         image, error in         let imageofvideo = image! uiimage         mediaitem.image = imageofvideo;         //used fetch video//         imgmanager.requestavasset(forvideo: fetchresult.object(at: i) phasset, options: phvideorequestoptions(), resulthandler: {(avasset, audiomix, info) -> void in             if let asset = avasset as? avurlasset {                 let videodata = url(string: "\(asset.url)")                 let duration : cmtime = asset.duration                 let durationinsecond = cmtimegetseconds(duration)                 print(durationinsecond)                 mediaitem.videourl = videodata!                 self.mediaarray.append(mediaitem)             }          })     }) }  

then use media array populate collectionview. don't forget unwrap data. don't use force unwrapping , (almost) never have crashes