This post is from the Activity iPhone Duo UIKit Q&A.
on the iPhone Duo simulator reports two distinct "Integrated" screens ("LCD" at 1398×2034 and "LCD-1" at 2007×2853), both simultaneously powered on. Is this the correct mental model for the real hardware — a genuine cover display and inner display as separate UIScreen objects — as opposed to one continuously flexible panel whose bounds just change? This significantly affects whether we handle the transition via trait/size-class changes or via UIScreen.didConnectNotification-style multi-screen handling.