我想将自定义字体设置为UIButton。我需要以编程方式设置它，因为不应用字体。问题是，它会在单击后变回内置字体。我做错了什么？

import UIKit

class LoginViewController: UIViewController {
    
    @IBOutlet weak var emailTextField: UITextField!
    @IBOutlet weak var passwordTextField: UITextField!
    @IBOutlet weak var eyeButton: UIButton!
    @IBOutlet weak var loginButton: UIButton!
    
    var iconClick = true
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        loginButton.titleLabel?.font = UIFont(name: "Capitana-Bold", size: CGFloat(16))
    }
    
    @IBAction func iconAction(sender: AnyObject) {
        if (iconClick == true) {
            passwordTextField.isSecureTextEntry = false
            eyeButton.setImage(UIImage(named: "eye-closed"), for: .normal)
        } else {
            passwordTextField.isSecureTextEntry = true
            eyeButton.setImage(UIImage(named:  "eye-open"), for: .normal)
        }
        iconClick = !iconClick
    }
    
    
    @IBAction func onLoginClicked(_ sender: Any) {
       
    }
}