https://medium.com/@nathangitter/building-fluid-interfaces-ios-swift-9732bb934bf5

At WWDC 2018, Apple designers presented a talk titled “Designing Fluid Interfaces”, explaining the design reasoning behind the gestural interface of iPhone X.

It’s my favorite WWDC talk ever—I highly recommend it.

The talk provided some technical guidance, which is exceptional for a design presentation, but it was pseudo-code, leaving a lot of unknowns.