UIView surface custom transformation/animation (like 'a water drop effect')

Question

What is the way to implement custom transformation (+ animation) on a view surface (similar to the images attached) (not

Answer 1

Read this excellent blog post by Bartosz Ciechanowski:

http://ciechanowski.me/blog/2014/05/14/mesh-transforms/

To wrap it up: Apple does this with private API around a class called 'CAMeshTransform'.

The author proposes an self-written substitute:

https://github.com/Ciechan/BCMeshTransformView

It's pretty amazing actually!