setAsRootViewController.swift

extension UIViewController {
	func setAsRootViewController(animated: Bool, completion: (() -> Void)?) {
		let appDelegate = UIApplication.shared.delegate as? AppDelegate

		if animated {
			UIView.transition(with: (appDelegate?.window)!, duration: 0.5, options: .transitionCrossDissolve,
				animations: {
					let oldState: Bool = UIView.areAnimationsEnabled
					UIView.setAnimationsEnabled(false)
					appDelegate?.window?.rootViewController = self
					UIView.setAnimationsEnabled(oldState)
				},
				completion: { (finished: Bool) -> () in completion?() })
		} else {
			appDelegate?.window?.rootViewController = self
		}
	}
}