title: Alpha does not work in UITableViewCell
body: <p>I am continuing an app for iOS directed to iPad. And <a href="https://stackoverflow.com/questions/34715017/selecting-a-cell-and-changing-the-alpha-of-all-cells-in-tableview-swift">asked a question</a> this morning on the site where I got the right answer to my question. But for some reason, the Alpha is not working in cells of my table.</p>
  
  <p>This is my View ties TableView:</p>
  
  <p><a href="https://i.stack.imgur.com/ceBvi.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ceBvi.png" alt="enter image description here"></a></p>
  
  <p>And this is my Swift code:</p>
  
  <pre><code>import UIKit
  
  class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
  
      let data:[String] = ["Row 0","Row 1", "Row 2","Row 3","Row 4","Row 5","Row 6"]
  
      @IBOutlet var tableView: UITableView!
      var rowSelected:Int! = nil
  
      override func viewDidLoad() {
          super.viewDidLoad()
      }
  
      func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -&gt; Int {
          return data.count
      }
  
      func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -&gt; UITableViewCell {
          let cell:Cell = self.tableView.dequeueReusableCellWithIdentifier("cell") as! Cell
          if rowSelected != nil {
              if rowSelected &gt; indexPath.row {
                  cell.alpha = 0.7
              } else if rowSelected == indexPath.row {
                  cell.alpha = 1.0
              } else {
                  cell.alpha = 0.3
              }
          }
  
          cell.labelText.text = self.data[indexPath.row]
  
          return cell
      }
  
      func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
          self.rowSelected = indexPath.row
  
          tableView.reloadRowsAtIndexPaths([indexPath], withRowAnimation: .Automatic)
      }
  }
  </code></pre>
  
  <p>When I select one row, nothing happens, the Alpha does not. In this example, I applied the Alpha directly in cell (I disabled the Opaque option in the cell - the cell is not opaque). <strong>In the original app I have 2 Labels, 2 buttons and a picture. To be more practical, necessary for the Alpha is used directly in the Cell.</strong></p>
  
  <p>Can someone help me?</p>