title: UITableViewCell doesn't get deselected when swiping back quickly
body: <p>I've now updated three of my apps to iOS 7, but in all three, despite them not sharing any code, I have the problem where if the user swipes to go back in the navigation controller (rather than tap the back button) quickly, the cell will remain in its selected state.</p>
  
  <p>For the three apps, one uses custom cells created programmatically, another uses custom cells created in a storyboard and the third uses default cells in a very basic subclass of UITableView, also in a storyboard. In all three cases, the cells don't deselect by themselves. If the user swipes slowly, or hits the back button, they deselect as normal.</p>
  
  <p>This is only happening in my iOS 7 apps, Apple's own apps and third party apps upgraded for iOS 7 all seem to be behaving normally (albeit with slight differences in how quickly the cells gets deselected).</p>
  
  <p>There must be something I'm doing wrong, but I'm not sure what?</p>