Going back to the previous page programatically - swift

Question

enter image description hereI am making a user login page for my IOS App. I am trying to make everything programmatically without using a segue in the main story board. I have managed to go to the next page as you can see in the code and create a custom left back bar item. But I don't know how to go back to the first page when I click on that button. I have attached the screen shot of my story board and app below. Can you please tell me how I can go back to the first page by clicking the X button?
Here is my code:
import UIKit
class FirstPage: UIViewController {
let hgt = UIScreen.main.bounds.height/2
private let loginSignup: UIButton = {
let button = UIButton(type: .system)
button.setTitle("Login or Sign Up", for: .normal)
button.translatesAutoresizingMaskIntoConstraints = false
button.titleLabel?.font = UIFont.boldSystemFont(ofSize: 20)
button.setTitleColor(.green, for: .normal)
button.addTarget(self, action: #selector(loginSignupBtn), for: .touchUpInside)
return button
}()
#objc private func loginSignupBtn() {
let vc = self.storyboard!.instantiateViewController(withIdentifier: "Login") as! Login
vc.loadViewIfNeeded()
self.navigationController?.pushViewController(vc, animated: true)
self.navigationController?.isNavigationBarHidden = false
let backItem = UIBarButtonItem(title: "X ", style: UIBarButtonItem.Style.done, target: nil, action: nil)
let font = UIFont.boldSystemFont(ofSize: 26)
backItem.setTitleTextAttributes([NSAttributedString.Key.font:font] ,for: .normal)
backItem.tintColor = UIColor.green
vc.navigationItem.leftBarButtonItem = backItem
}
override func viewDidLoad() {
super.viewDidLoad()
setupLayout()
}
override func viewWillAppear(_ animated: Bool) {
}
private func setupLayout() {
let topImageContainerView = UIView()
//topImageContainerView.backgroundColor = .yellow
view.addSubview(topImageContainerView)
//enable auto layout
topImageContainerView.translatesAutoresizingMaskIntoConstraints = false
topImageContainerView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
topImageContainerView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
topImageContainerView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
topImageContainerView.heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 0.5).isActive = true
view.addSubview(loginSignup)
loginSignup.translatesAutoresizingMaskIntoConstraints = false
loginSignup.topAnchor.constraint(equalTo: view.topAnchor,constant:hgt/2).isActive = true
loginSignup.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
loginSignup.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
loginSignup.heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 0.5).isActive = true
}
}
enter image description here

Answer 1

Here you need to add target and selector for when the x button is clicked
let backItem = UIBarButtonItem(title: "X ",
style: UIBarButtonItem.Style.done,
target: self, action:#selector(goBack))
#objc func goBack(_ bar:UIBarButtonItem) {
self.navigationController?.popToRootViewController(animated:true)
}