title: How to center two views in super view with greater than or equal to constraints
body: <p>I made an example ViewController with two Labels to highlight my issue.  The goal is to vertically separate the labels by 10, and then center them vertically using greater than or equal to constraints.  I'm using visual format, but this should apply if I setup my constraints like <code>view.topAnchor.constraint(greaterThan...</code>.  I also have two constraints to horizontally layout the labels</p>
  
  <p>My ViewController:</p>
  
  <pre><code>class myVC: UIViewController {
      lazy var titleLabel: UILabel = {
          let l = UILabel(frame: .zero)
          l.translatesAutoresizingMaskIntoConstraints = false
          l.text = "Hello World"
          l.font = .systemFont(ofSize: 50)
          l.textColor = .black
          return l
      }()
  
      lazy var descLabel: UILabel = {
          let l = UILabel(frame: .zero)
          l.translatesAutoresizingMaskIntoConstraints = false
          l.text = "description"
          l.font = .systemFont(ofSize: 35)
          l.textColor = .gray
          return l
      }()
  
      override func viewDidLoad() {
          super.viewDidLoad()
  
          view.backgroundColor = .yellow
          view.addSubview(titleLabel)
          view.addSubview(descLabel)
          titleLabel.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
          descLabel.leadingAnchor.constraint(equalTo: titleLabel.leadingAnchor).isActive = true
          NSLayoutConstraint.activate(NSLayoutConstraint.constraints(withVisualFormat: "V:|-(&lt;=50)-[titleLabel]-(10)-[descLabel]-(&lt;=50)-|", options: .init(), metrics: nil, views: ["titleLabel": titleLabel, "descLabel": descLabel]))
      }
  
  }
  </code></pre>
  
  <p>This results in <a href="https://i.stack.imgur.com/k2Wpk.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/k2Wpk.png" alt="wrong constraints"></a>.  From my understanding, this SHOULD separate the views by 10 pts, and center the labels vertically because in the format <code>"V:|-(&lt;=50)-[titleLabel]-(10)-[descLabel]-(&lt;=50)-|"</code> I say that the distance between the Title Label's top and the superView's top should be at least (greaterThanOrEqualTo) 50, and the distance between the description Label's bottom and the superView's bottom should be at least 50.  What should my top and bottom constraints look like if I want to center the two labels vertically?</p>
  
  <p>Yes, I realize I can just set vertical and horizontal centers, but this is an example I made for a problem I can't use those for.  I need to be able to center the View with greater(or less) than or equal to constraints.</p>