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(r: 50 , g: 80, b: 130)     button.setTitle("Register", for: .normal)     button.translatesAutoresizingMaskIntoConstraints = false     button.setTitleColor(.white, for: .normal)     button.addTarget(self, action:#selector(handleRegister), for: .touchUpInside)     return button }() 

and here is my function

    func handleRegister(){      FIRAuth.auth()?.createUser(withEmail: email, password: password,completion: { (user, error) in          if error != nil         { print("Error Occured")}          else         {print("Successfully Authenticated")}     })         } 

I'm getting compile error, if addTarget removed it compiles successfully

Answer 1

Yes, don't add "()" if there is no param

button.addTarget(self, action:#selector(handleRegister), for: .touchUpInside).  

and if you want to get the sender

button.addTarget(self, action:#selector(handleRegister(_:)), for: .touchUpInside).   func handleRegister(sender: UIButton){    //... } 

Edit:

button.addTarget(self, action:#selector(handleRegister(_:)), for: .touchUpInside) 

no longer works, you need to replace _ in the selector with a variable name you used in the function header, in this case it would be sender, so the working code becomes:

button.addTarget(self, action:#selector(handleRegister(sender:)), for: .touchUpInside) 

Answer 2

Try this with Swift 4

buttonSection.addTarget(self, action: #selector(actionWithParam(_:)), for: .touchUpInside) @objc func actionWithParam(sender: UIButton){     //... }  buttonSection.addTarget(self, action: #selector(actionWithoutParam), for: .touchUpInside) @objc func actionWithoutParam(){     //... }