Fluid Interfaces

Design and review principles for fluid, gestural, physically-responsive interfaces, distilled from Apple's WWDC 2018 "Designing Fluid Interfaces" talk (the iPhone X gestural UI team). Use when designing or reviewing touch/gesture interactions, spring-based motion, drag-to-dismiss or swipe gestures, scroll physics, elastic/ rubberband behaviors, redirectable animations, or when something "feels off", "feels janky", "doesn't feel native", or needs to "feel more fluid/natural/alive". Covers response latency, interruptibility, spatial consistency, gesture hinting, momentum projection, one-to-one touch tracking, and springs vs timed animations. Not for static visual design (co…