How the iPhone Duo Fold Animation Works
iPhone Duo fold animation From the engineering notebook of Zubair Hussain Shah. An article on sensor-driven interface rendering on foldable devices. Light Dark Auto Not to be confused with the general fold-aware layout APIs in Jetpack WindowManager, which describe window geometry rather than animation. iPhone Duo fold animation p = 0 closed p = 0.5 half open p = 1 open blur peaks where the hinge is Normalised hinge progress p drives the transition. Blur and transparency reach their maximum near p = 0.5 and vanish at both rest positions. Overview Type Sensor-driven user interface transition Introduced on iPhone Duo, announced 9 September 2026 [1...