GoKawiilApple exposes iPhone Duo hinge-angle API to developers, Federighi says
Craig Federighi told Donald Decodes that Apple has built an API letting developers read the iPhone Duo's hinge angle to within about five degrees, as well as detect the device's overall 'pose,' such as book, table or tent positions. He also described the outer screen's translucent preview effect when opening the device as a deliberate, subtle design choice meant to create continuity between the closed and open states.
GoKawiil's interpretation of the reporting above, not reported fact.
Exposing hinge and pose data mirrors Apple's earlier strategy of opening gyroscope and accelerometer APIs, which developers used in unexpected ways; Federighi's comments suggest Apple hopes for similar creative experimentation with foldable-specific interactions. Simplifying pose detection rather than raw angle data could lower the barrier for most developers while still letting advanced apps access precise measurements for custom effects.
- Apple's hinge API reports angle accuracy of about five degrees and device 'pose' states.
- Federighi says most developers will use simplified pose categories like book, table, and tent rather than raw hinge data.
- The outer-to-inner screen transition effect was intentionally designed to feel automatic rather than like a flashy animation.
Source: 9to5mac.com — Ben Lovejoy, 2026-09-29
Published there as: “Craig Federighi on how Apple helps developers make the most of the iPhone Duo [Video]”
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