Swift 3: Unrecognized selector sent to instance

Question

I have a button in my view class attempting to add a selector function from a separate class as follows:

class ProfileView: UIView {
    createAccountButton.addTarget(self, action: #selector(ProfileViewController.createAccountClicked), for: .touchUpInside)
}

class ProfileViewController: UIViewController {
    func createAccountClicked() {
        print("button press")
    }
}

I am getting a unrecognized selector error when I am trying to reference this method outside of ProfileView. However it works when I simply put createAccountClicked() into ProfileView and call:

createAccountButton.addTarget(self, action: #selector(self.createAccountClicked), for: .touchUpInside)

instead. My question is - Is it possible to call a function from a separate class? Or would just having the function in the same class be the correct design pattern to follow?

Answer 1

For your issue try changing the code like below:

class ProfileView: UIView {
    createAccountButton.addTarget(ProfileViewController, action: #selector(ProfileViewController.createAccountClicked), for: .touchUpInside)
}

Is it possible to call a function from a separate class? Or would just having the function in the same class be the correct design pattern to follow?

Yes, you can call a function from outside by declaring a class function or an object of that class. Check the class function below

class ProfileViewController: UIViewController {
 class func someTypeMethod() {
    //body
}
}