title: How to make a label fade in or out in swift
body: <p>I am looking to make a label fade in, in <code>viewDidLoad()</code>, and then after a timer is at 3 fade out.  I am not familiar with the <code>fadein</code> or <code>fadeout</code> functions.</p>
  
  <p>How would I go about doing this?</p>