Adding an overlay to a grid tableView
<p>I have a tableview which each row has 4 images. I have implemented a share option which will allow the user to select multiple images. How can I add an overlay or some kind of visual effect to show that the image is selected?</p>

<p><img src="http://i.stack.imgur.com/RpFQT.png" alt="enter image description here"></p>

<p>I would like to add some overlay to display that an image is selected, but How would this be done without adding a new set of subview for each thumbnail? And once that is done, how would the selection of the new views be linked back to the images behind them so that they can be added to an array?</p>

<p>Or is there an easier way to do this?</p>

<p>Thanks</p>
