// 1️⃣ AppDelegate
if let appDelegate = UIApplication.shared.delegate as? AppDelegate {
	appDelegate.window?.rootViewController = MyviewController
}

// 2️⃣ SceneDelegate
if let windowScene = UIApplication.shard.connectedScenes.first as UIWindowScene,
   let sceneDelegate = windowScene.delegate as? SceneDelegate 
{
	sceneDelegate.window?.rootViewController = MyViewController

	// rootViewController 변경 시 애니메이션 추가
	if let window = sceneDelegate.window {
		UIView.transition(with: window, duration: 0.25, options: .transitionCrossDissolve, animations: { })
	}
}