Interpolate is an open source Swift library from Roy Marmelstein is an open source Swift library that aids in creating gesture driven animations.
Interpolate allows you to tie your animations to an interpolation of values which you can base on the current state of a gesture.
A couple of examples are included, and the most common types can be interpolated to control your animations.
Here’s an animation from the readme showing one of the examples in action:
You can find Interpolate on Github here.
A nice Swift library for those looking to create gesture controlled animations.