medium-form-combine-vc1.swift

//
//  ViewController.swift
//

import UIKit

class ViewController: UIViewController {
    // 1
    lazy var stackView: UIStackView = {
        let view = UIStackView()
        view.axis = .vertical
        view.spacing = 8
        view.translatesAutoresizingMaskIntoConstraints = false
        return view
    }()

    lazy var emailTextField: UITextField = {
        let textField = UITextField()
        textField.textContentType = .emailAddress
        textField.keyboardType = .emailAddress
        textField.autocorrectionType = .no
        textField.autocapitalizationType = .none
        textField.borderStyle = .roundedRect
        textField.placeholder = "Enter email.."
        return textField
    }()
    
    lazy var passwordTextField: UITextField = {
        let textField = UITextField()
        textField.borderStyle = .roundedRect
        textField.placeholder = "Enter password.."
        textField.isSecureTextEntry = true
        return textField
    }()
    
    lazy var submitButton: UIButton = {
        let button = UIButton(type: .system)
        button.setTitle("Login", for: .normal)
        button.setTitleColor(.lightGray, for: .disabled)
        button.addTarget(self, action: #selector(onSubmit), for: .touchUpInside)
        return button
    }()

    override func viewDidLoad() {
        super.viewDidLoad()
        setupViews()
        setupConstraints()
    }
    
    func setupViews() {
        // 2
        view.addSubview(stackView)
        stackView.addArrangedSubview(emailTextField)
        stackView.addArrangedSubview(passwordTextField)
        stackView.addArrangedSubview(submitButton)
    }

    func setupConstraints() {
        // 3
        NSLayoutConstraint.activate([
            stackView.centerYAnchor.constraint(equalTo: view.centerYAnchor),
            stackView.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 24),
            stackView.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -24),
            emailTextField.heightAnchor.constraint(equalToConstant: 48),
            passwordTextField.heightAnchor.constraint(equalToConstant: 48),
            submitButton.heightAnchor.constraint(equalToConstant: 48)
        ])
    }

    // 4
    @objc func onSubmit() {
        // handle submit here
    }
}