https://techcrunch.com/2019/09/26/apples-ios-and-ipados-13-support-multiple-ps4-or-xbox-one-controllers-which-could-be-huge-for-arcade/

Apple’s iOS 13 update (and the newly-renamed iPadOS for iPad hardware) both support multiple simultaneous Bluetooth game controller connections. Apple added Xbox One and PlayStation 4 controller support in the updates, and after doing some digging, I can confirm that you can use multiple of either type of controller on one iOS device running the update, with each controlling a different player character.

That’s the good news: The bad news is that not many games take advantage of this right now. I wasn’t able to find a game in Apple’s new Arcade subscription service to try this out, for instance – and even finding a non-Arcade iOS game took a bit of digging. I finally was able to try local multi-controller multiplayer with Horde, a free-to-play 2-player co-op brawler, and found that it worked exactly as you’d expect.