I’ve mentioned a number of libraries for making it easier to animate with UIKit, most recently the Cocos2D inspired UIKitAnimationPro.
Here’s a library that allows you to animate UIKit elements using a different approach called Jazz Hands.
With Jazz Hands animations are key frame based making it easier to set up complex animations. You can animate view moving, resizing, alpha, and hide and show views.
As the readme states:
Jazz Hands is a simple, keyframe based animation framework for UIKit. Animations can be controlled via gestures, scroll views, kvo, or ReactiveCocoa.
Jazz Hands is used extensively in IFTTT for iPhone, most famously in the app intro:
Here is an image from the readme showing Jazz Hands being used in the IFTTT app:
You can find JazzHands on Github here.
A very nice UIKit animation library.
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