ios - How to change tabbar on Swift (xCode)? -

how change tabbar?

1. positioning image

2. width central button

3. white color not selected button

image tabbar

3. decided.

written in func viewdidload (class:uitabbarcontroller)

    item in self.tabbar.items! {         if let tabbaritem = item as? uitabbaritem {             tabbaritem.image = tabbaritem.image!.imagewithrenderingmode(.alwaysoriginal)         }     }