Facebook has announced today that is has open sourced Pop, which is the engine behind Paper’s smooth animations and transitions. It was open-sourced on GitHub.
Pop uses dynamic animations rather than static animations to control scrolling, bouncing, and unfolding effects in its social news app.
Kimon Tsinteris, a software engineer at Facebook that co-founded Push Pop Press, points out that iOS always excelled at supporting static animations. ?The Apple-provided Core Animation framework makes linear, ease-in, ease-out, and ease-in-ease-out animations simple to leverage,? stated Tsinteris. ?With Pop, we are able to keep the familiar and powerful programming model of Core Animation while also capturing a gesture?s velocity and better reflecting user intent.?