My app - natively iOS but built with the "Designed for iPad" option to run on Mac - does not recognise an attached USB microphone when running on a Mac. This line int32_t items = (int32_t) [[[AVAudioSession sharedInstance] availableInputs] count ]; returns 1, which is the Mac internal mic. On iPad and iPhone it sees both the internal mic and the USB mic. Is this an inherent "Designed for iPad" restriction, and is there some trick I can pull to get the USB microphone to be recognised by the system?

I have an Apple TV photo slideshow app (Objective-C, Storyboard based, transitioned to scenes and UIKit from old Appdelegate model) which is trivial but exhibits a problem I can't fix. The app has 2 UIImageViews, pulls photos from iCloud, replaces the back view, fades between them, swaps front and back images. I cannot for the life of me work out how to tell tvOS / UIKit that I need to stay in the foreground. Other slideshow apps manage it, clearly movie viewing apps like Netflix, Disney+ and BBC iPlayer manage to stay on top without the user needing to interact with the UI, but I keep getting pushed out. The pushing out happens only if I am playing music on the Apple TV, either using the built-in music app or AirPlaying music to the Apple TV from an iPad or phone. The issue is reproducible in an app that does nothing except load up a photo from the main bundle into a UIImageView. It's as if the OS thinks I'm idle and I need to nudge it to remind it I'm still here, but I can find no hints in Apple's documentation as to how I should do this. Project of trivial app here : https://drive.google.com/file/d/1eY_nQJ7adHEgAvFwhS-t38dqBEPVovub/view?usp=sharing