Spring is a delightful animation library for iOS that turns complex Core Animation sequences into simple, declarative presets you can trigger with a few lines of Swift. It exposes a large set of ready-made animations—springy pops, fades, slides, morphs, and attention-grabbers—so designers and developers can prototype polished interactions rapidly. Thanks to Interface Builder support (via inspectable properties), many animations can be configured visually and previewed live, shortening the...