Swift add constraint programmatically

Question

I add a UILabel (amountLabel) in UIViewController in storyboard editor. And then in swift file, viewDidLoad, I programatically create a

Answer 1

Make sure you added the paymentTextField to your view:

paymentTextField.translatesAutoResizingMaskIntoConstraints = false
view.addSubview(paymentTextField)

...

Add your constraints, for example paymentTextField.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true