Simple layout anchor example

demo.cs

faceContainingImage.Image = UIImage.FromFile("docs.jpg");

//Put it on the screen
View.AddSubview(faceContainingImage);
faceContainingImage.TranslatesAutoresizingMaskIntoConstraints = false;
var dpConstraints = new[]
{
  faceContainingImage.LeadingAnchor.ConstraintEqualTo(View.LayoutMarginsGuide.LeadingAnchor),
  faceContainingImage.TrailingAnchor.ConstraintEqualTo(View.LayoutMarginsGuide.TrailingAnchor),
  faceContainingImage.TopAnchor.ConstraintEqualTo(View.LayoutMarginsGuide.TopAnchor, 40.0f),
  faceContainingImage.HeightAnchor.ConstraintEqualTo(View.LayoutMarginsGuide.HeightAnchor, (nfloat) 0.5)
};
NSLayoutConstraint.ActivateConstraints(dpConstraints);