View not displaying and centralising with autolayout

Question

I want to add a view in my view controller programmatically and centralise it. I added the view as subview to the parent view and enable autolayout yet its not showing.

import UIKit

class ViewController: UIViewController {
    lazy var newView:UIView = {
        let view = UIView()
        view.backgroundColor = #colorLiteral(red: 0.4745098054, green: 0.8392156959, blue: 0.9764705896, alpha: 1)
        view.frame = CGRect(x: 0, y: 0, width: 200, height: 200)
        return view
    }()


    let titleLable = UILabel()
    let bodyLabel = UILabel()
    override func viewDidLoad() {
        super.viewDidLoad()

        view.addSubview(newView)
        newView.translatesAutoresizingMaskIntoConstraints = false


        newView.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
        newView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true



    }


}

Answer 1

Size constraints are missing for newView. You removed them with newView.translatesAutoresizingMaskIntoConstraints = false. To restore all required constraints add the lines below to viewDidLoad:

newView.widthAnchor.constraint(equalToConstant: 200).isActive = true
newView.heightAnchor.constraint(equalToConstant: 200).isActive = true