Our rock star designer Jonathan Saragousi has a fetish for beautiful easing transitions in our animations. The correct easing method can make the difference between a plain animation and a jaw-dropping one.
In Cal for instance, most of the animations use EaseOutQuart transitions. (You can find a nice demonstration of the different transitions here)
We implement the custom animations using a very cool project called NSBKeyframeAnimation.
A while ago we moved Cal to using Auto layouts, and of course – auto layout does not behave well at all with custom animations.
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Posted by adamsiton 
Core-Cocoa 