iOS Present modal view controller on startup without flash

Question

I\'d like to present modally, at first startup, a tutorial wizard to the user.

Is there a way to present a modal UIViewController on application startup

Answer 1

let vc = UIViewController()
vc.modalPresentationStyle = .custom
vc.transitioningDelegate = noFlashTransitionDelegate
present(vc, animated: false, completion: nil)

class NoFlashTransitionDelegate: NSObject, UIViewControllerTransitioningDelegate {

    public func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController? {
        if source.view.window == nil,
            let overlayViewController = UIStoryboard(name: "LaunchScreen", bundle: nil).instantiateInitialViewController(),
            let overlay = overlayViewController.view {
                source.view.addSubview(overlay)
                UIView.animate(withDuration: 0, animations: {}) { (finished) in
                    overlay.removeFromSuperview()
            }
        }
        return nil
    }
}