Apple Arcade. Use iphone as a controller?

Hello Southpaw!,

Welcome to the Apple Support Communities. I understand you want to use your iPhone as a controller for the Apple TV. I'll be happy to explain.

You can use the Apple TV Remote app for iPhone: Set up the Apple TV Remote on your iPhone, iPad, or iPod touch

You can also use any of these accessories as controllers for Apple Arcade: Connect a wireless game controller to your Apple device

Thanks and have a great day.

Southpaw!,

Those are the possible controllers you can use with Apple Arcade. If there is something you'd like to see from the iPhone and Apple TV, you can leave feedback here: Product Feedback - Apple

Take care.