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

Adding a constraint(NSLayoutAttributeHeight) that sets height of the view to 0 worked for me:

[self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.captchaView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0 constant:0]];