How can I change screens layout for landscape and portrait in iOS – Ios swift

You can do it programmatically, declare your menuContainer view under your class controller like that:

let menuContainer: UIView = {
    let v = UIView()
    v.backgroundColor = .lightGray
    v.alpha = 0
    v.translatesAutoresizingMaskIntoConstraints = false
    
    return v
}()

Now in viewDidLoad set constraints:

override func viewDidLoad() {
    super.viewDidLoad()
    
    view.backgroundColor = .darkGray
    
    view.addSubview(menuContainer)
    menuContainer.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
    menuContainer.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor).isActive = true
    menuContainer.trailingAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
    menuContainer.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
}

after that write the detect func (I add animation but you can’t do it):

fileprivate func detectRotation() {
    if UIDevice.current.orientation == UIDeviceOrientation.landscapeLeft {
        print("landscape left")
        UIView.animate(withDuration: 0.3, delay: 0, options: .curveEaseOut, animations: {
            self.menuContainer.alpha = 1
            self.view.layoutIfNeeded()
        }, completion: nil)
    } else if UIDevice.current.orientation == UIDeviceOrientation.landscapeRight {
        print("landscape right")
        UIView.animate(withDuration: 0.3, delay: 0, options: .curveEaseOut, animations: {
            self.menuContainer.alpha = 1
            self.view.layoutIfNeeded()
        }, completion: nil)
    } else {
        print("porrait")
        UIView.animate(withDuration: 0.3, delay: 0, options: .curveEaseOut, animations: {
            self.menuContainer.alpha = 0
            self.view.layoutIfNeeded()
        }, completion: nil)
    }
}

override viewWillTransition func and call detectRotation func:

override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
    detectRotation()
}

This is the result:

portrait

Landscape

To show in landscape and portrait:

let myButton: UIButton = {
    let b = UIButton()
    b.backgroundColor = .white
    b.setTitle("Section 1", for: .normal)
    b.setTitleColor(.black, for: .normal)
    b.titleLabel?.font = .systemFont(ofSize: 17, weight: .regular)
    b.titleLabel?.adjustsFontSizeToFitWidth = true
    b.titleLabel?.minimumScaleFactor = 0.5
    b.translatesAutoresizingMaskIntoConstraints = false

    return b
}()

let myButton2: UIButton = {
    let b = UIButton()
    b.backgroundColor = .white
    b.setTitle("Section 2", for: .normal)
    b.setTitleColor(.black, for: .normal)
    b.titleLabel?.font = .systemFont(ofSize: 17, weight: .regular)
    b.titleLabel?.adjustsFontSizeToFitWidth = true
    b.titleLabel?.minimumScaleFactor = 0.5
    b.translatesAutoresizingMaskIntoConstraints = false

    return b
}()

let myButton3: UIButton = {
    let b = UIButton()
    b.backgroundColor = .white
    b.setTitle("Section 3", for: .normal)
    b.setTitleColor(.black, for: .normal)
    b.titleLabel?.font = .systemFont(ofSize: 17, weight: .regular)
    b.titleLabel?.adjustsFontSizeToFitWidth = true
    b.titleLabel?.minimumScaleFactor = 0.5
    b.titleLabel?.textAlignment = .left
    b.translatesAutoresizingMaskIntoConstraints = false

    return b
}()

let myButton4: UIButton = {
    let b = UIButton()
    b.backgroundColor = .white
    b.setTitle("Section 4", for: .normal)
    b.setTitleColor(.black, for: .normal)
    b.titleLabel?.font = .systemFont(ofSize: 17, weight: .regular)
    b.titleLabel?.adjustsFontSizeToFitWidth = true
    b.titleLabel?.minimumScaleFactor = 0.5
    b.titleLabel?.textAlignment = .left
    b.translatesAutoresizingMaskIntoConstraints = false

    return b
}()

let menuContainer: UIView = {
    let v = UIView()
    v.backgroundColor = .lightGray
    v.alpha = 1
    v.translatesAutoresizingMaskIntoConstraints = false

    return v
}()

override func viewDidLoad() {
    super.viewDidLoad()
    
    view.backgroundColor = .darkGray
    
    view.addSubview(menuContainer)
    menuContainer.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
    menuContainer.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor).isActive = true
    menuContainer.trailingAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
    menuContainer.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true

    let stackViewMenu = UIStackView(arrangedSubviews: [myButton, myButton2, myButton3, myButton4])
    stackViewMenu.axis = .vertical
    stackViewMenu.distribution = .fillEqually
    stackViewMenu.spacing = 2
    stackViewMenu.translatesAutoresizingMaskIntoConstraints = false
    
    menuContainer.addSubview(stackViewMenu)
    stackViewMenu.topAnchor.constraint(equalTo: menuContainer.safeAreaLayoutGuide.topAnchor).isActive = true
    stackViewMenu.leadingAnchor.constraint(equalTo: menuContainer.leadingAnchor).isActive = true
    stackViewMenu.trailingAnchor.constraint(equalTo: menuContainer.trailingAnchor).isActive = true
    stackViewMenu.heightAnchor.constraint(equalTo: menuContainer.heightAnchor, multiplier: 0.5).isActive = true
}

The result: