Xcode IB: UIButton hidden but have still buttons space

Question

I have the following issue in my iPhone app. I have 4 buttons in my IB also linked to my UIViewController (IBOutlet) When I for example hide the second

Answer 1

1. You can add the buttons programmatically -> you will have the array of Btns and method to add array to the view controller.
2. You can play with the Constraints and set Height Constraint for 2nd button when hide it to 0 but all buttons should be connected with the constraints in this case.