JazzHands

Why we included this project

If your iOS app needs a guided onboarding flow or a parallax intro, JazzHands was the library that popularized scroll-driven keyframe animation before UIKit shipped its own timeline APIs. You define keyframes for properties like alpha, rotation, scale, translation, and corner radius, then feed the animator a scalar value from a scroll offset, a gesture, KVO, or ReactiveCocoa to drive the views. It also includes an AutoLayout-aware paging scroll view controller, so layout stays correct across rotation and split-screen on iPad. The framework is lightweight Objective-C, installed via CocoaPods, and it drops into existing view controllers without a big restructure. For Swift users, the sibling RazzleDazzle offers the same approach with modern syntax.