title: Collection View Cells alpha is changing after scroll
body: <p>I created a Collection View where the cells have a view inside. The views have a alpha value of 0.65. When I scroll, the view gets brighter. Maybe the views will be stacked on top of each other?</p>
  
  <p>MY CODE:</p>
  
  <pre><code>func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -&gt; UICollectionViewCell {
      let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! LevelStufenCell
  
      cell.levelViewBack = UIView()
      cell.levelViewBack.frame = CGRect(x: 0, y: 0, width: cell.frame.height, height: cell.frame.width)
      cell.levelViewBack.layer.cornerRadius = cell.levelViewBack.frame.height * (36 / 198)
      cell.levelViewBack.backgroundColor = UIColor.white
      cell.levelViewBack.alpha = 0.65
      cell.insertSubview(cell.levelViewBack, at: 10)
  
      return cell
  }
  </code></pre>