title: How to deactivate my constraints?
body: <p>
  I have a UITextView created programmatically in swift and this is what I have in my viewDidLoad() for my controller. </p>
  
  <pre class="lang-or-tag-here prettyprint-override"><code>let isPortrait = UIInterfaceOrientationIsPortrait(UIApplication.shared.statusBarOrientation)
  if isPortrait {
      searchTextView.widthAnchor.constraint(equalToConstant: view.frame.width * 0.7).isActive = true
  } else {
      searchTextView.widthAnchor.constraint(equalToConstant: view.frame.width * 0.1).isActive = true
  }
  </code></pre>
  
  <p>This is how the searchTextView is setup</p>
  
  <pre class="lang-or-tag-here prettyprint-override"><code>func setupView() {
      self.layer.cornerRadius = 8.0
      self.translatesAutoresizingMaskIntoConstraints = false
      self.textContainerInset = UIEdgeInsets(top: 12, left: 10, bottom: 0, right: 10)
      self.textContainer.maximumNumberOfLines = 1
      self.textContainer.lineBreakMode = .byTruncatingHead
      self.autocorrectionType = .no
      self.text = ""
      self.font = Constants.fonts().largeFont
      self.backgroundColor = UIColor.white
      self.adjustsFontForContentSizeCategory = true
      self.textColor = UIColor.black
  
      self.layer.borderColor = UIColor.gray.cgColor
      self.layer.borderWidth = 0.25
  
      // Need clipsToBounds = false to show shadow
  
      self.clipsToBounds = false
      self.layer.shadowRadius = 20.0
      self.layer.shadowColor = UIColor.gray.cgColor
      self.layer.shadowOffset = CGSize(width: 2.0, height: 2.0)
      self.layer.shadowOpacity = 0.5
  
      self.tintColor = Constants.colors().primaryLightColor
  
  }
  </code></pre>
  
  <p>This gives searchTextView a different widthAnchor based on the device orientation. This works fine, however, later I check when the device orientation is going to change and remove and add the corresponding widthAnchors.</p>
  
  <pre class="lang-or-tag-here prettyprint-override"><code>override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
      sideMenuLauncher.dismissSideMenu(duration: 0)
  
      let toPortraitMode = self.view.frame.size.width &gt; size.width
      searchTextView.widthAnchor.constraint(equalToConstant: view.frame.width * 0.7).isActive = toPortraitMode
      searchTextView.widthAnchor.constraint(equalToConstant: size.width * 0.1).isActive = !toPortraitMode
  
  
      for constraint in view.constraints {
          print("\(constraint)\n")
      }
  
      searchTextView.updateConstraints()
      searchTextView.layoutIfNeeded()
  
  }
  </code></pre>
  
  <p>But this does not actually deactivate any constraints, as it says in this console output: </p>
  
  <pre class="lang-or-tag-here prettyprint-override"><code>(
  "&lt;NSLayoutConstraint:0x60c000896170 PickupApp.SearchBarView:0x7f7ee1016a00.width == 56.8   (active)&gt;",
  "&lt;NSLayoutConstraint:0x604000c9c6b0 PickupApp.SearchBarView:0x7f7ee1016a00.width == 397.6   (active)&gt;"
  )
  
  Will attempt to recover by breaking constraint 
  &lt;NSLayoutConstraint:0x604000c9c6b0 PickupApp.SearchBarView:0x7f7ee1016a00.width == 397.6   (active)&gt;
  </code></pre>
  
  <p>I can't figure out why these constraints are not being deactivated even though constraints are being added.</p>