[jrnkntl]

Nice work. Keeping animation in the presentation-layer makes sense for 90% of the projects.

Any reason for the iOS 7 requirement?

[jamztang]

There are so much awesome APIs on iOS 7 that we planned to leverage in the future, cutting off legacy platforms simply help us focus on looking ahead instead of backwards.

[eddieroger]

At first glance, it appears to be doing a lot of UIKIt Dynamics stuff, and that only came to 7.

[lukeredpath]

Using the new keyframe animation API by the looks of things.

[jamztang]

Yes it's using the keyframe APIs, it might be more like an experimental code style for now, but we will keep revising to make it better.