title: Can't programmatically set NSLayoutConstraint multiplier in swift... "Cannot assign to the result of this expression
body: <p>I am trying to programmatically set the constraint for a multiplier in swift, and when I set the value, it just gives me the error, "Cannot assign to the result of this expression"...</p>
  
  <p>I declared the NSLayoutConstraint with an IBOutlet, and then set the multiplier, same as I did with the constant for another, which works fine, but this one won't accept it...</p>
  
  <pre><code>@IBOutlet weak var clockWidthConstraint: NSLayoutConstraint!
  
  override func updateViewConstraints() {
      super.updateViewConstraints()
  
      confirmTopConstraint.constant = 40.0
      clockWidthConstraint.multiplier = 0.1  // Gives me the error!
  
      }
  </code></pre>
  
  <p>Any ideas?</p>