Swift inheritance carrying over constraints - swift

Question

In my swift code below I am attempting to use inheritance. When I go to class middle the constraints on the initial view controller are still being applied. Even though in middle class I attempt to attach new constraints to right button they are not being applied. You can see what is going wrong in the photo below.
import UIKit
class ViewController: UIViewController {
var right = UIButton()
override func viewDidLoad() {
super.viewDidLoad()
[right].forEach{
$0.translatesAutoresizingMaskIntoConstraints = false
view.addSubview($0)
$0.backgroundColor = UIColor(
red: .random(in: 0.0...1),
green: .random(in: 0.9...1),
blue: .random(in: 0.7...1),
alpha: 1
)
}
NSLayoutConstraint.activate([
right.bottomAnchor.constraint(equalTo: view.bottomAnchor),
right.leadingAnchor.constraint(equalTo: view.leadingAnchor),
right.heightAnchor.constraint(equalTo: view.heightAnchor,multiplier: 0.1),
right.widthAnchor.constraint(equalTo: view.widthAnchor,multiplier: 1),
])
right.setTitle(">", for: .normal)
right.addTarget(self, action: #selector(nexte), for: .touchDown)
}
#objc func nexte(){
let vc = middle()
vc.modalPresentationStyle = .overCurrentContext // actually .fullScreen would be better
self.present(vc, animated: true)
}
}
class middle : ViewController{
var leftbtn = UIButton()
override func viewDidLoad() {
super.viewDidLoad()
[leftbtn].forEach{
$0.translatesAutoresizingMaskIntoConstraints = false
view.addSubview($0)
$0.backgroundColor = UIColor(
red: .random(in: 0.0...1),
green: .random(in: 0.9...1),
blue: .random(in: 0.7...1),
alpha: 1
)
}
NSLayoutConstraint.activate([
leftbtn.bottomAnchor.constraint(equalTo: view.bottomAnchor),
leftbtn.leadingAnchor.constraint(equalTo: view.leadingAnchor),
leftbtn.heightAnchor.constraint(equalTo: view.heightAnchor,multiplier: 0.1),
leftbtn.widthAnchor.constraint(equalTo: view.widthAnchor,multiplier: 0.5 ),
right.bottomAnchor.constraint(equalTo: view.bottomAnchor),
right.leadingAnchor.constraint(equalTo: leftbtn.trailingAnchor),
right.heightAnchor.constraint(equalTo: view.heightAnchor,multiplier: 0.1),
right.widthAnchor.constraint(equalTo: view.widthAnchor,multiplier: 0.5 ),
])
}
}

Answer 1

You are saying super.viewDidLoad() in Middle. super is ViewController so ViewController's viewDidLoad is executed too. Thus "When I go to class middle the constraints on the initial view controller are still being applied".
You should rethink your whole architecture here.