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Inspiration for this button bar came from the app Path in which they practically removed the need for a UITabBar by adding a button in the bottom left. The goal with this widget is to replicate that functionality and give you the option of using buttons that animate in and out to reclaim some much needed UI space.
The widget is designed to be highly portable and lightweight. Customization is simple, even if you want to tear up the source code. Forks and pull requests are much appreciated.