Hinge, multitasking and scenes

Three capabilities that are unique to iPhone Duo, in rising order of ambition: reacting to the hinge, participating in Split View, and putting your own UI on both displays at once.

The hinge

The system itself responds to the hinge — the wallpaper reacts to the angle with a zoom effect as the device opens. Apps can read the same signal.

Use the onHingeChange modifier in SwiftUI, or UIHingeInteraction in UIKit. Both give you:

• a coarse status — closed, partially open, fully open
• a continuous angle, updated live

onHingeChange hands your closure the previous and current hinge context.