Progress button (obj-c) [gif]

I was recently inspired by Apple's progress buttons in the app store, so I decided to create my own to use within Guidebook. This is a screen recording of the actual button running in the app (not a prototype).

[edit] we decided to take this one further and open source it. Details here: http://engineering.guidebook.com/2015/12/15/guidebooks-progress-button-open-sourced/