Argument of '#selector' does not refer to an '@objc' method, property, or initializer

Question

I sublcassed in Swift 3 a UIButton subclass that is written in Objective-C.

When I try to add a target, it fails with an error code:

class ActionButton: JTImageButton {      func action() {      }      func configure()) {         // ...         self.addTarget(self, action: #selector(self.action()), for: .touchUpInside)         // error:          // Argument of '#selector' does not refer to an '@objc' method, property, or initializer      } } 

Answer 1

The problem is that in #selector(self.action()), self.action() is a method call. You don't want to call the method; you want to name the method. Say #selector(action) instead: lose the parentheses, plus there's no need for the self.