title: How to show a message on screen for a few seconds?
body: <p>I want to display a message on screen after the user presses a button. I then want the message to disappear after about a second. Preferably it would fade away instead of a hard disappear.  </p>
  
  <p>I would rather not lock up the UI during the display of the message. In fact, I would like the timer to restart for the message if the button is pressed again. I'm unsure of whether to use NSTimer, dispatch_after, or if there are other options.  </p>
  
  <p>I currently plan to use an NSTimer and a UI label to achieve this, and I will just live with a hard disappear. Is that the best way to do it?</p>
  
  <p>EDIT: To clarify, the message will not necessarily be the same every single time that the button is pushed. I'm not entirely sure if this is relevant though.</p>