I have an IOS app with a `UITabBar` and have its delegate set to my class.. the `didSelectTabBarItem` properly fires and all is right with the world. However I do have some conditional code that has to occur when the `UITabBarItem` selected is after one particular `UITabBarItem` IE.. if the user clicks on tab bar item 3, and they were currently on tab bar item 2 I have to do a little extra code, that I would not have to do if the user selected tab bar item 3 and was previously on tab bar item 1. 

So, is there anyway programmatically (other than keeping direct track via my program via a state variable, to know what was the previously selected item was on a tab bar when a new tab bar item is selected?