The Steam Link app is finally available on iOS (and tvOS) after being available on Android, and then the Raspberry Pi sbc, for a year. The Steam Link app acts like the now-discontinued Steam Link box and streams your Steam library (and more) to your phone, tablet, or TV. The iOS & Apple TV tvOS app allows for Bluetooth controllers like the Steam Controller as well as Apple-approved controllers that are already available for iOS and tvOS.
Apple initially approved and then blocked the Steam Link app for iOS last year. Presumably that was because Valve’s Steam store was available to users, which was a not-great on Apple’s part but makes about as much sense (none) as Apple demanding a cut of Amazon’s ebooks. The new version of the Steam Llink iOS app doesn’t let people access Valve’s store while streaming, it only allows people to play their game library.
The newest versions of the Android app also allows people to stream games when they’re away from home, the iOS app doesn’t have that feature yet and so you’ll be stuck playing on your home network.
As I’ve said before, I don’t think it is any good that the streaming of games you own locally is controlled by any store, platform, or driver company (like Nvidia’s Shield game streaming service.) There could be a third-party, entirely open-source effort to stream your desktop with performance in-mind, but there isn’t. The closest thing is the Moonlight project, but it is only available for people with Nvidia’s graphics cards.
All that said, I played a game of Into the Breach streamed to my iPhone from a Windows host using the new app and while that was a confusing setup process (disabling the virtual mouse, enabling the virtual gamepad) it was ultimately rewarding.
I did have one crash when I switched apps and the network connection had been dropped, but I just resumed the game once I re-launched the Link app.
Streaming from a macOS host is a giant pain in the ass, involving the installation of multiple kernel extensions, reboots, and then installing more kernel extensions and more reboots. I can’t imagine this will get any easier with macOS 10.15, if it’s possible at all. Apple delivers a warning to let you know that something Valve is doing won’t work with “…a future version” of macOS:
That is an ominous warning for a person to read who just wants to play a fucking game. I’m sure they’ll rush out to install the next big macOS upgrade.