Apple's iOS and iPadOS 13 support multiple PS4 or Xbox One controllers, which could be huge for Arcade

Hands on with Apple Arcade in iOS 13

Which Controllers Work With Stadia, PS Now, xCloud, and Nvidia GeForce Now?

Pair PS4 or Xbox Controller with iPhone and iPad

20 Best iOS Games with Controller Support (2023)

iOS 13, tvOS 13 Features Support For PS4, Xbox One Controllers

Apple's Xbox and PS4 controller support turns an iPad into a portable game console - The Verge

Best Games with Controller Support iOS - App Store

Microsoft makes using Xbox Controllers on iOS even better

Pair an Xbox controller with your Apple devices - Polygon