iOS equivalent for Android View.GONE visibility mode

Question

I\'m developing an app for iOS and I\'m using the Storyboard with AutoLayout ON. One of my view controllers has a set of 4 buttons, and in certain circumstances i would like

Answer 1

This question is pretty old but the closet thing I've found is setting additional constraints (so the views around the "gone" view know what to do once it's missing)

A  which you want to be     A
|  after setting B to gone  |
B                           C
|                               
C                               

1. Set a lower priority (750) constraint from C to A.
2. Add B's top and bottom constraints (or left and right if you want your view to collapse horizontally) to an NSLayoutConstraint array bConstraints. Do this by:
   1. Control click and drag from the constraint to the ViewController
   2. Change Connection from Outlet to Outlet Collection
   3. For name put bConstraints.
   4. Hit connect. This will create an @IBOutlet var bConstraints: [NSLayoutConstraint]! in your ViewController
   5. To add additional constraints: drag from the constraint in Storyboard to the @IBOutlet variable name

3. Then hide B

   B.hidden = true
   NSLayoutConstraint.deactivateConstraints(bConstraints)
   

4. To unhide

   B.hidden = false
   NSLayoutConstraint.activateConstraints(bConstraints)
   

Obviously the more and more views you have the more complex this grows, as you need additional constraints from each view