title: Move position of Label in iOS 8
body: <p>I´m trying to move the position of a Label but it does not work.</p>
  
  <p>What i´ve done so far is to add a Label zu my view, add the constraints for initial position.</p>
  
  <p>within viewDidLoad() i now want to move the label to another position.</p>
  
  <p>The basic idea is to have three labels and according to some states, change the order of the labels.</p>
  
  <p>i tried this within viewDidLoad():</p>
  
  <pre><code>var point1 = beacon1Label.center as CGPoint
  var point2 = beacon2Label.center as CGPoint
  var point3 = beacon3Label.center as CGPoint
  
  beacon3Label.center = point1
  beacon1Label.center = point2
  </code></pre>
  
  <p>but the position does not change. Do i have to disable the constraints to work like this?</p>