Clash Royale CLAN TAG

Update alpha of image inside UICollectionViewCell

I have a list of an object that have image inside it, I upload the image in this object to firebase storage after showing it inside a collectionviewcell, every thing is work correctly but I need change the alpha of image inside the uicollectionviewcell according to progress of uploading it to firebase storage, what I try the following:

class MediaItem :Codable
{
var id : Int? = 0
var url : String? = ""
var pickedImage = UIImage()
var currentState:State = .none
var progress:Float = 0

func start () {
currentState = .uploading
var data = Data()
data = UIImageJPEGRepresentation(self.pickedImage, 0.8)!
// Create a root reference
let storageRef = Storage.storage().reference()
let imageName = NSUUID().uuidString
// Create a reference to the file you want to upload
let imageRef = storageRef.child("images/(imageName).jpg")

// Upload the file to the path "images/
let uploadTask = imageRef.putData(data, metadata: nil) { (metadata, error) in
guard let metadata = metadata else {
// Uh-oh, an error occurred!
return
}
}
_ = uploadTask.observe(.progress) { snapshot in
self.progress = (Float(100.0 * Double(snapshot.progress!.completedUnitCount)
/ Double(snapshot.progress!.totalUnitCount))/100) //Float(snapshot.progress!.completedUnitCount)
print("self.progress",self.progress)
}
uploadTask.observe(.success) { snapshot in
self.currentState = .uploaded
self.url = imageName
}
uploadTask.observe(.failure) { snapshot in
self.currentState = .none
print("Failuer")
}
}
}


When pick an image:

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
dismiss(animated: true, completion:nil)
let tempMediaItem = MediaItem()

if let pickedImage = (info[UIImagePickerControllerOriginalImage] as? UIImage)
{
tempMediaItem.pickedImage = pickedImage
}

else if let videoUrl = info[UIImagePickerControllerMediaURL] as? NSURL{
print("videourl: ", videoUrl)
//trying compression of video
// let data = NSData(contentsOf: videoUrl as URL)!
tempMediaItem.pickedImage = firstFrame(videoUrl as URL)!
}
else
{
print("Something went wrong")
return
}

tempMediaItem.start()
arrayOfImages?.append(tempMediaItem)
collView.reloadData()
}


And in UICollectionView, cellForItemAt indexPath :

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "editPostCell", for: indexPath) as! editPostCell

cell.workImage.image = arrayOfImages?[indexPath.row].pickedImage


// cell.workImage.alpha = 0.1
if arrayOfImages?[indexPath.row].currentState == .none
{
arrayOfImages?[indexPath.row].start()
}
cell.workImage.alpha = CGFloat((arrayOfImages?[indexPath.row].progress)!)
return cell
}


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