UIViewController Extension

UIViewController+Extension.swift

extension UIViewController {
    func showViewController(withIdentifier identifier: String, storyboardName: String = "Main") {
        DispatchQueue.main.async {
            let storyboard = UIStoryboard(name: storyboardName, bundle: nil)
            let viewController = storyboard.instantiateViewController(withIdentifier: identifier)
            self.view.window?.setRootViewController(viewController)
        }
    } 
}