title: Prevent UIButton's setTitle:forState: animation
body: <p>I am using a <code>NSTimer</code> to update a <code>UIButton</code>'s title every second.</p>
  
  <p>It works but the text in the title blinks (animates to alpha <code>0</code> and back) automatically.</p>
  
  <p>I tried to use <code>button.layer.removeAllAnimations()</code> with no luck, and no exceptions, so QuartzCore seems to be correctly linked.</p>
  
  <hr>
  
  <p>Current non-working paranoid code:</p>
  
  <pre><code>UIView.setAnimationsEnabled(false)
  UIView.performWithoutAnimation {
      button.setTitle(time, forState: .Normal)
      button.layer.removeAllAnimations()
          }
  UIView.setAnimationsEnabled(true)
  </code></pre>