title: UIActivityIndicatorView, display during image download on current view
body: <p>I have a button and, when pressed, it downloads several images from the web in order to display them in another view.  However, at the moment, when I press the button, the button goes to its highlighted state and seems to get  stuck there while the images download (and essentially the next view is prepared).  I'm not fussed about the button being stuck in highlighted mode (in fact I prefer it that way). </p>
  
  <p>However, what I would like is for a UIActivityView to be displayed on the view where the button is displayed while the next view loads (and the images are downloaded from the web, as this takes a while)...How would I go about implementing this logically?</p>
  
  <p>Thanks,</p>
  
  <p>Jack</p>