Camera on iPhone Duo

iPhone Duo is the first iPhone with two front cameras. Both are square sensors with an ultra-wide field of view: one on the outer display, and one beneath the inner display — the first under-display camera on iPhone.

That creates a problem no previous iPhone had. "Front" no longer means "pointing at the user."

Pick a strategy first

Everything downstream follows from this choice.

The virtual front camera — automatic, limited

Discover a front camera the ordinary way — an AVCaptureDevice.DiscoverySession requesting position .front with a Wide or Ultra Wide device type — and on iPhone Duo you resolve to a new virtual front camera. It switches between the two physical cameras by itself: inner camera when open, outer camera when closed.