CiderTV, a software-based alternative for your Apple TV Remote, includes a built-in keyboard and has the ability to control linked Smart TV volume. As of recently, the app comes with a handy widget that makes it possible to control most of the functions of your Apple TV right from the Notification Center. It will save you a lot of time, here's how to get started with CiderTV and set up the widget.
How to control Apple TV from your iPhone’s Lock screen with CiderTV widget
