Implement a custom StaggereGrid in UIView like Etsy app in SWIFT

问题

I want to implement a StaggeredGrid like Etsy app, but i have no idea about it.

Can you give me any advices to do that?

this is an screenshot of what i need to do:

来源：https://stackoverflow.com/questions/26717561/implement-a-custom-staggeregrid-in-uiview-like-etsy-app-in-swift