title: UITableviewCell accessoryView can't be changed
body: <p>I need to change the accessoryView to proper UIImageView</p>
  
  <pre><code>func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -&gt; UITableViewCell {
  
       var cell = tableView .dequeueReusableCellWithIdentifier("ActivitySectionCell") as! ActivitySectionCell
       var imageNameOfAccessory = expandedSections.containsIndex(indexPath.section) ? "collapse" : "edit"
       cell.accessoryView = UIImageView(image: UIImage(named: imageNameOfAccessory))
       return cell
  }
  
  
  func tableView(tableViewMethod: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
              tableViewMethod.deselectRowAtIndexPath(indexPath, animated: true)
  
                 var cell = tableView(self.tableViewMain, cellForRowAtIndexPath: indexPath) as! ActivitySectionCell
                 if currentlyExpanded {
                      var imageNameOfAccessory = !currentlyExpanded ? "collapse" : "edit"
                      cell.accessoryView = UIImageView(image: UIImage(named: imageNameOfAccessory))
                  }
                  else {
                      var imageNameOfAccessory = !currentlyExpanded ? "collapse" : "edit"
                      cell.accessoryView = UIImageView(image: UIImage(named: imageNameOfAccessory))
                  }
  
  
      }
  </code></pre>
  
  <p>I checked in debug, sometimes I set "collapse" image, sometimes "edit" image, but after that I always see "edit" image in the cell.</p>
  
  <p>So when I set accessoryView at the very beginning , I can't change it after that (actually I can change the view pointer, but after that on the screen I don't see any changes)</p>