title: Update Label.text setNeedsDisplay() not working - Swift
body: <p>I have a complex table of calculations that loops for every day of the year. At the end of each day's loop I want to update the screen. These are all myLabel.text output. view.setNeedsDisplay() ain't working. Do I need to call it externally or use something else? E.g.</p>
  
  <pre><code>for var day = 1; day &lt; 366; day++ {
       dayLabel.text = String(format: "%i", day)
       view.setNeedsDisplay()
  }
  </code></pre>