UIButton in Swift is not registering touches

Question

I\'m trying to create a UIButton using Swift. It compiles fine and I can see my button in the simulator, but when I click it, nothing happens. This is the code I am using:

Answer 1

I had the same issue when implementing UIButton and SearchBar on container view(UIView). In my case, the cause was the constraint issue. Constraint to searchBar had issue and because of this, function set had never been called.

You can see if there's any from "Debug View Hierarchy" button. (constraint problem is shown as purple warning)

(env: iOS12, xcode10.1)