I am building a project right now. I have built various views and started going on YouTube to create view controllers for a log in screen. Every time I run the simulator I can't see the view controller for the log in screen to see my progress, instead, it runs the views I made for the content view.
How can I display the View Controller in the preview or simulator? This log in file I am working does not show up in either and I would like to see my progress. Please let me know what is going on.
Thanks!
import UIKit
class LogInViewController: UIViewController {
private let scrollView: UIScrollView = {
let scrollView = UIScrollView()
scrollView.clipsToBounds = true
return scrollView
}()
private let imageView: UIImageView = {
let imageView = UIImageView()
imageView.image = UIImage(systemName: "message.fill")
imageView.contentMode = .scaleAspectFit
return imageView
}()
private let emailField: UITextField = {
let field = UITextField()
field.autocapitalizationType = .none
field.autocorrectionType = .no
field.returnKeyType = .continue
field.layer.cornerRadius = 12
field.layer.borderWidth = 1
field.layer.borderColor = UIColor.lightGray.cgColor
field.placeholder = "Enter your email address"
field.leftView = UIView(frame: CGRect(x: 0, y: 0, width: 5, height: 0))
field.leftViewMode = .always
field.backgroundColor = .white
return field
} ()
private let passwordField: UITextField = {
let field = UITextField()
field.autocapitalizationType = .none
field.autocorrectionType = .no
field.returnKeyType = .done
field.layer.cornerRadius = 12
field.layer.borderWidth = 1
field.layer.borderColor = UIColor.lightGray.cgColor
field.placeholder = "Enter your password"
field.leftView = UIView(frame: CGRect(x: 0, y: 0, width: 5, height: 0))
field.leftViewMode = .always
field.backgroundColor = .white
field.isSecureTextEntry = true
return field
} ()
private let loginButton: UIButton = {
let button = UIButton()
button.setTitle("Log In", for: .normal)
button.backgroundColor = .link
button.setTitleColor(.white, for: .normal)
button.layer.cornerRadius = 12
button.layer.masksToBounds = true
button.titleLabel?.font = .systemFont(ofSize: 20, weight: .bold)
return button
}()
override func viewDidLoad() {
super.viewDidLoad()
title = "Log In"
view.backgroundColor = .white
navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Register",
style: .done,
target: self,
action: #selector(didTapRegister))
loginButton.addTarget(self,
action: #selector(loginButtonTapped),
for: .touchUpInside)
//hitting return calls the log in function
emailField.delegate = self
passwordField.delegate = self
// add fields subview
view.addSubview(scrollView)
scrollView.addSubview(imageView)
scrollView.addSubview(emailField)
scrollView.addSubview(passwordField)
scrollView.addSubview(loginButton)
}
//lay out on screen
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
scrollView.frame = view.bounds
let size = scrollView.width/3
imageView.frame = CGRect(x: (scrollView.width-size)/2,
y: 20,
width: size,
height: size)
emailField.frame = CGRect(x: 30,
y: imageView.bottom + 10,
width: scrollView.width - 60,
height: 52)
passwordField.frame = CGRect(x: 30,
y: emailField.bottom + 10,
width: scrollView.width - 60,
height: 52)
loginButton.frame = CGRect(x: 30,
y: passwordField.bottom + 10,
width: scrollView.width - 60,
height: 52)
}
@objc private func loginButtonTapped() {
emailField.resignFirstResponder()
passwordField.resignFirstResponder()
guard let email = emailField.text,
let password = passwordField.text,
!email.isEmpty, !password.isEmpty, password.count >= 6 else {
return
}
}
func alertUserLoginError() {
let alert = UIAlertController(title: "Didn't quite crack the code",
message: "Please enter all info to log on",
preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "Dismiss",
style: .cancel,
handler: nil))
present(alert, animated: true)
}
@objc private func didTapRegister() {
let vc = RegisterViewController()
vc.title = "Create Account"
navigationController?.pushViewController(vc, animated: true)
}
}
extension LogInViewController: UITextFieldDelegate {
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
if textField == emailField {
passwordField.becomeFirstResponder()
} else if textField == passwordField {
loginButtonTapped()
}
return true
}
