UIKit

Apple Music's mini player swells into the full now playing screen as if the artwork unfolds. Recreating that morph in my own music app, the stock tools (matchedGeometryEffect, .navigationTransition(.zoom)) both broke, because the mini player lives in a separate view tree. Here's the hand-rolled fix: a single-use stand-in cover that springs from one frame to the other on top of everything, the traps it took to make it seamless, and how to adapt the technique to any app.