title: How to remove constraints programmatically that is added from storyboard?
body: <p>I have googled but not find out answer. So I need to ask.
  I have one home screen. When User is logged in it will display one view as like bellow
  <img src="https://i.stack.imgur.com/JU0L2.jpg" alt="enter image description here">
  Now When User logged out and visiting home page he will see above layout but without center boxed layout. If I set That layout hidden it is now displaying as follows.
  <img src="https://i.stack.imgur.com/EI8hG.jpg" alt="enter image description here"></p>
  
  <p>I want to move third layout to little bit above to remove white space.. </p>
  
  <p>I added constraints using storyboard. Now need to remove constraints from programming and add one constraints that will set layout to bellow first layout..</p>