Why doesn't my addTarget's function on button work?

Question

I am implementing some function to be called once a button is tapped but the function's body doesn't get called. Here is my code which demonstrates what I need to do

let editProfileFollowButton: UIButton = {
        let button = UIButton(type: .system)
        button.setTitle("Edit Profile", for: .normal)
        button.setTitleColor(.black, for: .normal)
        button.titleLabel?.font = UIFont.boldSystemFont(ofSize: 14)
        button.layer.borderColor = UIColor.lightGray.cgColor
        button.layer.borderWidth = 1
        button.layer.cornerRadius = 3
        button.addTarget(self, action: #selector(handleEditProfileOrFollow), for: .touchUpInside)
        return button
    }()
    @objc func handleEditProfileOrFollow () {
        print("Execute edit profile or follow ")
    }

and this is what happens in my init

addSubview(editProfileFollowButton)
        editProfileFollowButton.setAnchor(top: postsLabel.bottomAnchor, left: postsLabel.leftAnchor, right: followingLabel.rightAnchor, bottom: nil, paddingBottom: 0, paddingLeft: 0, paddingRight: 0, paddingTop: 2, height: 34, width: 0)
    }

PS: setAnchor is a function that I created to set up the constraints of the view programmatically

Answer 1

From the code you have shown, the most obvious thing is your use of let

When building variables with actions using a closure style, I have always been under the impression that you should use a lazy var instantiation. This is used (I believe) as self is not known at compile time.

lazy var editProfileFollowButton: UIButton = {
        let button = UIButton(type: .system)
        button.setTitle("Edit Profile", for: .normal)
        button.setTitleColor(.black, for: .normal)
        button.titleLabel?.font = UIFont.boldSystemFont(ofSize: 14)
        button.layer.borderColor = UIColor.lightGray.cgColor
        button.layer.borderWidth = 1
        button.layer.cornerRadius = 3
        button.addTarget(self, action: #selector(handleEditProfileOrFollow), for: .touchUpInside)
        return button
    }()
    @objc func handleEditProfileOrFollow () {
        print("Execute edit profile or follow ")
    }

The use of lazy var is a property whose initial value is not calculated until the first time it is used. (Source )