You have several threads opened. Don't forget to close them once solved.

You may have to maintain a reference to this window, through environment object. Have a look here: https://stackoverflow.com/questions/60359808/how-to-access-own-window-within-swiftui-view

When you tried: self.view.window.windowScene Which object is self ?

Could you print the values of self.sceneView.center.x, self.sceneView.center.y ?

I would really be surprised those elements are considered public domain by Marvel. Anyway, to pass the app review, you should need a formal acceptance from Marvel. Honestly I do doubt you will ever get it.

You cannot change a button behaviour. That's forbidden. But to control brightness:         UIScreen.main.brightness = 0.1 // between 0 and 1

You may officially ask Marvel. But even for the challenge, I doubt Apple would prime an app that has any possible copyright issue. Good luck, and don't forget to close the the thread.

Could you show some code ? Are you sure you do not recreate a new label in header and foyer ? If so, a way to solve would be to check if supplementary view already exist before creating, or delete them before recreating. If that's OK, don't forget to close the thread (and also close other threads you have opened).

Here is the problem: line 8 you recreate a label and add it over if there is already an existing one: let headerUILabelText = UILabel() headerUILabelText.textAlignment = .left headerUILabelText.font = UIFont.systemFont(ofSize: 20, weight: .bold) headerUILabelText.numberOfLines = 0 headerUILabelText.text = "Your Roll Number is \(NumberInteger). Your Exam Numbers are \(examNumbers(number: "\(NumberInteger)"))" headerUILabelText.textColor = .darkGray headerUILabelText.lineBreakMode = .byTruncatingTail headerView.addSubview(headerUILabelText) You should either: remove subviews first test if there is already a UILabel and not recreate if so replace existing subview. I have used this extension: extension UIView { class func getAllSubviewsT: UIView(from parentView: UIView) - [T] { return parentView.subviews.flatMap { subView - [T] in var result = getAllSubviews(from: subView) as [T] if let view = subView as? T { result.append(view) } return result } } class func getAllSubviews(from parentView: UIView, types: [UIView.Type]) - [UIView] { return parentView.subviews.flatMap { subView - [UIView] in var result = getAllSubviews(from: subView) as [UIView] for type in types { if subView.classForCoder == type { result.append(subView) return result } } return result } } func getAllSubviewsT: UIView() - [T] { return UIView.getAllSubviews(from: self) as [T] } func getT: UIView(all type: T.Type) - [T] { return UIView.getAllSubviews(from: self) as [T] } func get(all type: UIView.Type) - [UIView] { return UIView.getAllSubviews(from: self) } } And call in your case: let allLabels = self.headerView.get(all: UILabel.self) for sub in allLabels { sub.removeFromSuperview() } And now you can safely add subview: headerView.addSubview(headerUILabelText)

@elitedeveloper  I was able to solve it myself... It would be kind to explain how. And don't forget to close the thread.

Usually, you can download from here: https://developer.apple.com/download/more/

Have you inspected all your source tags ? Did you try: option-clean build folder create a new project and paste the old code in it (after pasting in a text editor without format, to make sure you don't import erroneous hidden characters). Could you paste the code in the forum ?

What did you post ? Could you edit it properly so we can understand what it is ?

Please, explain what is your question take some care when you post code to make it easier to read: ZStack { LinearGradient(gradient: Gradient(colors: [Color.orange, Color.yellow, Color.white]), startPoint: .top, endPoint: .bottom) .edgesIgnoringSafeArea(.all) SwiftUIView() boton() .font(Font.system(size: 80)) .offset(x: 10, y: -10) } UIScreen.main.brightness = 0.1 // between 0 and 1 } } struct ContentView_Previews: PreviewProvider { static var previews: some View { ContentView() } } what do you do with line 12, copied in the middle of the code ? It should be inside some func (like a Button action) what is boton() ?

I see at least 2 ways: create a CoreAnimation with the transform keyPath let trans = CABasicAnimation(keyPath: "transform"); trans.fromValue = [0.0, 0.0, 1.0, 0.0] // you may have to correct this trans.toValue = [rotationAngle * .pi / 180.0, 0.0, 1.0, 0.0] // That's my guess of the correct set of parameters button.layer.add(cotransor, forKey: "rotation") // I am not sure of the keyPath to use For the list of keyPaths: https://stackoverflow.com/questions/44230796/what-is-the-full-keypath-list-for-cabasicanimation call animate on the view UIView.animate(withDuration: 2.0, delay: 0.0, options: .curveEaseOut, animations: { /* TRANSFORM */ }, completion: { (done) in } ) with the right animations and completion handler