iOS popup window how to implement?

Question

iOS

Good day!
Interested in how to implement a pop-up window in the iOS SDK project.
The bottom line is that in my application on one of the ViewControllers there is a certain UIButton. It is necessary that by clicking on the UIButton a window pops up on top of my ViewController, so that it can then be minimized back with a swipe, or by pressing the return button.
Examples
1) TouchID verification in AppStore (iOS 11.x)

2) Opening video page in YouTube App

Thanks in advance for your reply!

Answer 1

doublench21 @doublench21 by
Dmitry Golovanov, https://developer.apple.com/ios/human-interface-gu...
Written 53 minutes ago

https://gist.github.com/barbietunnie/e5547f3518043...

class MainViewController: UIViewController{
    override func viewDidLoad() {
           showModal()
    }
    func showModal() {
          let modalViewController = ModalViewController()
          modalViewController.modalPresentationStyle = .OverCurrentContext
          present(modalViewController, animated: true, completion: nil)
    }
}
class ModalViewController: UIViewController {
    override func viewDidLoad() {
        view.backgroundColor = UIColor.clear
        view.isOpaque = false
    }
}

Answer 2

https://www.cocoacontrols.com/controls/alertview
https://www.cocoacontrols.com/controls/bulletinboard
https://www.cocoacontrols.com/controls/biometricau...
And so on.