How to use addTarget method in swift 3

Question

here is my button object

    let loginRegisterButton:UIButton = {
    let button = UIButton(type: .system)
    button.backgroundColor = UIColor         


        

Answer 1

  let button: UIButton = UIButton()
    button.setImage(UIImage(named:"imagename"), for: .normal)
    button.addTarget(self, action:#selector(YourClassName.backAction(_sender:)), for: .touchUpInside)

    button.frame = CGRect.init(x: 5, y: 100, width: 45, height: 45)
    view.addSubview(button)

    @objc public func backAction(_sender: UIButton) {

    }