ios - How can I download Images off the web and load it in a UICollectionView then pass an array of images to the next view? -

so parsing json custom objects. inside these objects have url string make asynchronous call grab these images. load collection view.

my problems are:

1) how can load these images on cells without them disappearing or appearing on different cells scroll?

2) when tap on cell has pass on view , show on imageview

3) after image shows must have array of images in previous collection view switching amongst each other in same order.

please help!

also no third party libraries please!

 import uikit  class homepagecollectionviewcontroller: uicollectionviewcontroller {      var imagecache = nscache()      var hingeimagesarray = [hingeimage]()     var arraytoholdconvertedurltouiimages = [uiimage]()     var task: nsurlsessiondatatask?     //full of urls    var hingeimageurls = [string]()       var testimagearray = [uiimage]()      override func viewdidload() {         super.viewdidload()          // makes network call hingeimages         refreshitems()        }          override func numberofsectionsincollectionview(collectionview: uicollectionview) -> int {         return 1     }      override func collectionview(collectionview: uicollectionview, numberofitemsinsection section: int) -> int {         return hingeimagesarray.count       }       override func collectionview(collectionview: uicollectionview, cellforitematindexpath indexpath: nsindexpath) -> uicollectionviewcell {         let cell = collectionview.dequeuereusablecellwithreuseidentifier("imagereusecell", forindexpath: indexpath) as! imagecollectionviewcell          let image = hingeimagesarray[indexpath.row]           if let imageurl = image.imageurl {              if let url = nsurl(string: imageurl) {                    //check cached images , if found set them cells - works if images go off screen                 if let myimage = imagecache.objectforkey(image.imageurl!) as? uiimage {                      cell.collectionviewimage.image = myimage                      print(myimage)                  }else {                    // request images asynchronously collection view not slow down/lag                 self.task = nsurlsession.sharedsession().datataskwithurl(url, completionhandler: { (data, response, error) -> void in                             // check if there data returned                         guard let data = data else {                             return                         }                          // create image object our data , assign cell                           if let hingeimage = uiimage(data: data){                             self.testimagearray.append(hingeimage)                            //cache images/set key                           self.imagecache.setobject(hingeimage, forkey: image.imageurl!)                               dispatch_async(dispatch_get_main_queue(), { () -> void in                                     cell.collectionviewimage.image = hingeimage                                  })                         }                  })                  task?.resume()                 }             }          }          return cell     }                     override func collectionview(collectionview: uicollectionview, didselectitematindexpath indexpath: nsindexpath) {          if let cell = collectionview.cellforitematindexpath(indexpath) {              performseguewithidentifier("nextview", sender: cell)          }else{             print("no good")         }     }            override func prepareforsegue(segue: uistoryboardsegue, sender: anyobject?) {              if let indexpath = self.collectionview?.indexpathforcell(sender as! imagecollectionviewcell) {              if segue.identifier == "nextview" {                  let galleryviewcontroller = segue.destinationviewcontroller as! galleryviewcontroller                  //we passing url next screen making request show them                let imageurl = hingeimagesarray[indexpath.row]                   //passesd single image url                 galleryviewcontroller.imageurlfromotherscreen = imageurl.imageurl                       //pasing array of urls                  galleryviewcontroller.arrayofimageurlsfromotherview = hingeimageurls                  //let myindex = testimagearray[indexpath.row]                      //let image = arraytoholdconvertedurltouiimages[indexpath.row]                  //galleryviewcontroller.selectedimagefrompreviousscreen = image                 // galleryviewcontroller.arrayofimageobjects = arraytoholdconvertedurltouiimages                  //print(arraytoholdconvertedurltouiimages)               }           }      }          //execute json request     func refreshitems() {          hingeclient.executejsonnetworkrequest { (hingeimages, error) in              guard let images = hingeimages else {                 print("error getting images json")                 return             }               //loop through array , append urls new array             moreimages in hingeimages! {                  self.hingeimageurls.append(moreimages.imageurl!)              }                 self.hingeimagesarray = images                self.collectionview?.reloaddata()           }     }           } 

//more code illustrate how setting imageview.

 func moretest() {          dispatch_async(dispatch_get_global_queue(dispatch_queue_priority_default, 0)) {             urls in self.arrayofimageurlsfromotherview {              if let url = nsurl(string: urls) {              if let data = nsdata(contentsofurl: url) {              if let hingeimage = uiimage(data: data) {                   self.convertedurltoimages.append(hingeimage)                  dispatch_async(dispatch_get_main_queue(), {                     if self.galleryimageview.image == nil {                      self.galleryimageview.image = self.convertedurltoimages[0]                   }else{                       print("not empty")                 }                     })              }           }       }               }      }      }