textField will not move in programable scrollview - swift

Question

I have a UIScrollView. I have a UITextField and a UILabel. For some reason my UITextField it will not move in my scroll view but my UILablel will. I have added the UITextField the same way as I added my UILabel to the scrollview using scrollView.addSubview(textField). Anyone see what I am doing wrong on this one?
import Foundation
import UIKit
//here
protocol AddContactDelegate {
func addContact(contact: Contact)
}
class AddContactController: UIViewController {
//delegate
var delegate: AddContactDelegate?
//TextField
let textField: UITextField = {
let tf = UITextField()
tf.placeholder = "Add Your Workout Title"
tf.textAlignment = .center
tf.translatesAutoresizingMaskIntoConstraints = false
return tf
}()
override func viewDidLoad() {
super.viewDidLoad()
//making scroll view
let screensize: CGRect = UIScreen.main.bounds
let screenWidth = screensize.width
let screenHeight = screensize.height
var scrollView: UIScrollView!
scrollView = UIScrollView(frame: CGRect(x: 0, y: 120, width: screenWidth, height: screenHeight))
scrollView.contentSize = CGSize(width: screenWidth, height: 2000)
view.addSubview(scrollView)
//setting up how view looks-----
view.backgroundColor = .white
//top buttons
self.navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .done, target: self, action: #selector(handleDone))
self.navigationItem.leftBarButtonItem = UIBarButtonItem(barButtonSystemItem: .cancel, target: self, action: #selector(handleCancel))
//view elements
view.addSubview(textField)
scrollView.addSubview(textField)
textField.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
textField.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
textField.widthAnchor.constraint(equalToConstant: view.frame.width - 64).isActive = true
textField.becomeFirstResponder()
//excercise label
let excerciseNumber = UILabel(frame: CGRect(x: 0, y: 0, width: 200, height: 21))
excerciseNumber.center = CGPoint(x: view.frame.width / 2 , y: view.frame.height / 20)
excerciseNumber.textAlignment = .center
excerciseNumber.text = "Workout Title"
self.view.addSubview(excerciseNumber)
scrollView.addSubview(excerciseNumber)
}
//done button
#objc func handleDone(){
print("done")
guard let fullname = textField.text, textField.hasText else {
print("handle error here")
return
}
let contact = Contact(fullname: fullname, hello: "hi")
delegate?.addContact(contact: contact)
print(contact.fullname)
print(contact.hello)
}
//cancel button
#objc func handleCancel(){
self.dismiss(animated: true, completion: nil )
}
}

Answer 1

As you make the center x and y of the textfield with view not scrollView , You need
textField.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
textField.centerXAnchor.constraint(equalTo: scrollView.centerXAnchor),
textField.centerYAnchor.constraint(equalTo: scrollView.centerYAnchor),
textField.widthAnchor.constraint(equalToConstant: view.frame.width - 64)
])
Also remove
view.addSubview(textField)
self.view.addSubview(excerciseNumber)