A swift function to show a view or a view controller everywhere. Useful if you need to show a view from outside of a controller!

ShowEverywhere.swift

class ShowEverywhere{
    
    var view: UIView?
    
    var viewController: UIViewController?
    
    init(view: UIView){
        self.view = view
        self.viewController = nil
    }
    
    init(viewController: UIViewController) {
        self.viewController = viewController
        self.view = nil
    }
    
    func show(){    
        let appDelegate = UIApplication.shared.delegate  as! AppDelegate
        let appWindow = appDelegate.window
        var topViewController = appWindow?.rootViewController
        while topViewController?.presentedViewController != nil {
            topViewController = topViewController?.presentedViewController
        }
        if let viewToShow = self.view {
            viewToShow.alpha = 0.0
            topViewController?.view.addSubview(viewToShow)
            UIView.animate(withDuration: 0.2) {
                viewToShow.alpha = 1.0
            }
        }
        
        if let viewControllerToShow = self.viewController {
            topViewController?.present(viewControllerToShow, animated: true, completion: nil)
        }
    }
}

// USAGE:

// ShowEverywhere(myView/myViewController).show()
// Have fun!