How would you approach auto hide/show of tab bar

I'd like to add in the effect of hiding my UITabBarController when a user starts to scroll a table, and then if they start to scroll back towards the top, it reappears. Similar to how Safari works. I'm assuming that you look at scrollViewDidScroll and then do something like what is documented here:

http://stackoverflow.com/a/11490623

Does anyone have an example of hiding/showing the tab bar in C#? I can take a stab at translation, but if someone has a copy handy or if there is a demo that I missed I'd appreciate a pointer. The biggest part that I'm not sure of in the translation from ObjC is the animations part.

Thanks!

JB