iOS Swift Add UILabel programmatically using Visual Format Language (VFL)

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        
        self.navigationItem.title = "Main View"
        
        //Create labels programmatically with Visual Format Language (VFL) for Auto Layout
        addLabels()
        
   }
    
   func addLabels(){
        
        let myLabel = UILabel()
        myLabel.textColor = UIColor.orange
        myLabel.text = "Hello, World!"
        myLabel.font = myLabel.font.withSize(16)
        myLabel.translatesAutoresizingMaskIntoConstraints = false
        self.view.addSubview(myLabel)
    
        let myLabel2 = UILabel()
        myLabel2.textColor = UIColor.red
        myLabel2.font = myLabel2.font.withSize(24)
        myLabel2.text = "Hello, World!"
        myLabel2.translatesAutoresizingMaskIntoConstraints = false
        self.view.addSubview(myLabel2)
        
        var allConstraints: [NSLayoutConstraint] = []
        let views = ["view": view!, "myLabel": myLabel, "myLabel2": myLabel2]
        
        var horizontalConstraints = NSLayoutConstraint.constraints(
            withVisualFormat: "H:|-(>=10)-[myLabel]-(>=10)-|", metrics: nil, views: views)
        allConstraints += horizontalConstraints
        horizontalConstraints = NSLayoutConstraint.constraints(
            withVisualFormat: "H:|-(>=10)-[myLabel2(200)]-(>=10)-|", metrics: nil, views: views)
        allConstraints += horizontalConstraints
        myLabel2.centerXAnchor.constraint(equalTo: self.view.centerXAnchor).isActive = true
        
        var verticalConstraints = NSLayoutConstraint.constraints(
            withVisualFormat: "V:|-(>=40)-[myLabel(50)]", metrics: nil, views: views)
        allConstraints += verticalConstraints
        verticalConstraints = NSLayoutConstraint.constraints(
            withVisualFormat: "V:|-(>=100)-[myLabel2]", metrics: nil, views: views)
        allConstraints += verticalConstraints
    
        NSLayoutConstraint.activate(allConstraints)
        
    }

}