safeAreaLayoutGuide guide not working from another viewcontroller - ios

Question

As suggested by some experts like #DonMag , i design the view in a separate controller, while trying to do so , every thing works, but when i use a navigation controller and there is a navigation bar at top, if i try and design in separate controller and then add its view to another controller the safeAreaLayoutGuide does not work and the view is attached to top of screen ignoring the safearea
SOLUTION as per #Mohammad Azam, DonMag solutions works as well , thanks
import UIKit
class NotesDesign: UIView {
override init(frame: CGRect) {
super.init(frame: frame)
commonInit()
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func commonInit(){
let notesTitle = UITextField()
let notesContent = UITextView()
let font = UIFont(name: "CourierNewPS-ItalicMT", size: 20)
let fontM = UIFontMetrics(forTextStyle: .body)
notesTitle.font = fontM.scaledFont(for: font!)
notesContent.font = fontM.scaledFont(for: font!)
notesTitle.widthAnchor.constraint(greaterThanOrEqualToConstant:250).isActive = true
notesTitle.heightAnchor.constraint(equalToConstant: 30).isActive = true
notesTitle.borderStyle = .line
notesContent.widthAnchor.constraint(greaterThanOrEqualToConstant:250).isActive = true
notesContent.heightAnchor.constraint(greaterThanOrEqualToConstant: 100).isActive = true
notesContent.layer.borderWidth = 1
let notesStack = UIStackView()
notesStack.axis = .vertical
notesStack.spacing = 20
notesStack.alignment = .top
notesStack.distribution = .fill
notesStack.addArrangedSubview(notesTitle)
notesStack.addArrangedSubview(notesContent)
// Do any additional setup after loading the view.
notesStack.translatesAutoresizingMaskIntoConstraints = false
addSubview(notesStack)
notesStack.topAnchor.constraint(equalTo: safeAreaLayoutGuide.topAnchor, constant: 10).isActive = true
notesStack.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 20).isActive = true
notesStack.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -10).isActive = true
notesStack.bottomAnchor.constraint(equalTo: bottomAnchor, constant: -40).isActive = true
}
}
And where i call it
import UIKit
class AddNotesViewController: UIViewController {
var design = NotesDesign()
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = UIColor.white
view.addSubview(design)
design.translatesAutoresizingMaskIntoConstraints = false
navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Save", style: .plain, target: self, action: #selector(saveData))
}
#objc func saveData() {
}
}
And this is what i get

Answer 1

If you are taking a view from its ViewController and adding it as a subview to another view, you need to constrain it just like you would with any other added subview:
class AddNotesViewController: UIViewController {
var design = NotesViewDesign()
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = UIColor.white
view.addSubview(design.view)
// a view loaded from a UIViewController has .translatesAutoresizingMaskIntoConstraints = true
design.view.translatesAutoresizingMaskIntoConstraints = false
let g = view.safeAreaLayoutGuide
NSLayoutConstraint.activate([
// constrain the loaded view
design.view.topAnchor.constraint(equalTo: g.topAnchor),
design.view.leadingAnchor.constraint(equalTo: g.leadingAnchor),
design.view.trailingAnchor.constraint(equalTo: g.trailingAnchor),
design.view.bottomAnchor.constraint(equalTo: g.bottomAnchor),
])
navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Save", style: .plain, target: self, action: #selector(saveData))
}
#objc func saveData() {
}
}