UIScrollView not scrolling - ambiguous content size - ios

Question

I am trying to create a Scroll View. The view itself is correctly
displayed but it does not scroll, even though I added a view to it and
set the content size.
NOTE: I am not using storyboards but Constraints (AutoLayout) only.
Code:
let scrollView: UIScrollView = {
let sv = UIScrollView()
sv.isScrollEnabled = true
sv.backgroundColor = .brown
return sv
}()
override func viewDidLoad() {
super.viewDidLoad()
setupViews()
}
func setupViews() {
self.view.addSubview(scrollView)
scrollView.anchor(top: self.view.topAnchor, left: self.view.leftAnchor, bottom: self.view.bottomAnchor, right: self.view.rightAnchor, paddingTop: 0, paddingLeft: 0, paddingBottom: 0, paddingRight: 0, width: 0, height: 0)
scrollView.contentSize = CGSize(width: self.view.frame.width, height: 2000)
print(scrollView.contentSize)
let view = UIView()
view.backgroundColor = .blue
scrollView.addSubview(view)
view.anchor(top: scrollView.topAnchor, left: scrollView.leftAnchor, bottom: scrollView.bottomAnchor, right: scrollView.rightAnchor, paddingTop: 0, paddingLeft: 0, paddingBottom: 0, paddingRight: 0, width: 0, height: 0)
}
.anchor() is a custom extension I made in order to make constraining views easier.
Any help would be appreciated.

Answer 1

It's better not to mix autolayout with frame layout do
1- Comment
scrollView.contentSize = CGSize(width: self.view.frame.width, height: 2000)
2- set equal width constraint between the view inside the scrollview to the vc's view and a height constraint of 2000
For no confuse with vc's view change
let view = UIView()
to
let contentView = UIView()
then add these 2 constarints
contentView.widthAnchor.constraint(equalTo:self.view.widthAnchor).isActive = true
contentView.heightAnchor.constraint(equalToConstant:2000).isActive = true