Swift 3 Unrecognized selector sent to instance UIButton

Question

我得到这个错误：

由于未捕获的异常而终止应用 'NSInvalidArgumentException'，原因：'-[UITouchesEvent 文本]： 无法识别的选择器发送到实例 0x6100000e9400'

它崩溃的按钮：

import UIKit
import Firebase
import FBSDKLoginKit

class RegisterViewController: UIViewController, FBSDKLoginButtonDelegate, UITextFieldDelegate {

    override func viewDidLoad() {
    super.viewDidLoad()
        // Create Sign Up button
        let signUpButton: UIButton = {
            let button = UIButton()
            button.setImage(#imageLiteral(resourceName: "Go Button@1x"), for: .normal)
            button.addTarget(self, action: #selector(createAccountTapped), for: .touchUpInside) // when tapped on Sign In button, execute function SignInTapped
            button.translatesAutoresizingMaskIntoConstraints = false
            return button
            }()
        func signUpButtonView() {
            signUpButton.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
            signUpButton.heightAnchor.constraint(equalToConstant: 70).isActive = true
            signUpButton.widthAnchor.constraint(equalTo: view.widthAnchor, constant: 0).isActive = true
            signUpButton.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: 0).isActive = true
        }

        self.view.addSubview(signUpButton)
        signUpButtonView()

    }

    func createAccountTapped(_ usernameTextField: UITextField, passwordTextField: UITextField, repeatPasswordTextField: UITextField) {
        let username = usernameTextField.text
        let password = passwordTextField.text
        let repeatPassword = repeatPasswordTextField.text
    }
}

我有另一个用于注册 Facebook 的按钮，它工作正常...我认为这与函数 createAccountTapped 中的参数有关，但我不知道出了什么问题。

Answer 1

您不能通过UIButton 操作传递UITextField 实例，您只能使用UIButton 设置这些操作createAccountTapped() 和createAccountTapped(_ sender: UIButton)。

如果您想在您的UIButton 操作中访问textField，那么您需要在您的RegisterViewController 中为该textField 创建IBOutlet。