jwilling/JNWSpringAnimation

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

1007 stars · 63 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

An Objective-C library that subclasses CAKeyframeAnimation to provide spring physics (damped harmonic) animations for Core Animation layers on iOS and macOS. It serves as an open-source alternative to the private CASpringAnimation, with configurable stiffness, damping, and mass.

Use cases

• add spring physics animations to iOS UI elements
• animate CALayer properties with damped harmonic motion
• replace the private CASpringAnimation with an open-source equivalent
• create natural bounce effects for view transitions
• tune stiffness, damping, and mass for custom animation feel
• make iOS apps feel more physical and responsive

When to choose

• you need spring-based Core Animation animations in an Objective-C or Swift iOS/macOS app
• you want fine control over spring constants like stiffness, damping, and mass
• you're targeting older iOS versions before CASpringAnimation was public

When to avoid

• you're on modern iOS where the built-in CASpringAnimation or UIView spring APIs suffice
• you need velocity-based spring animations, which this library does not implement
• you need a maintained library with active support - the last release was in 2017

Facets

library · maturity maintenance

animation mobile-development graphics cpp core-animation spring-physics objective-c uikit damped-harmonic-motion ios macos swift

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