TabBar Item Customization

Normally Tab Items takes equal spacing. But according my design I need to change this behavior. Tab Items should take only the space it needs. Also Is there any option to modify the radius of the line as my design has this modification.

This is what I have tried:

[let tabBar = TabBar()
tabBar.delegate = self

tabBar.dividerColor = Color.clear


tabBar.lineColor = Colors.wiseMagenta!
tabBar.lineAlignment = .bottom

tabBar.backgroundColor = Color.clear
tabBar.tabItems = buttons

tabBar.tabBarStyle = .nonScrollable
tabBar.tabBarCenteringStyle = .never
tabBar.tabItemsInterimSpace = 0
tabBar.tabBarLineStyle = .auto

tabBar.frame = CGRect.init(x: 0, y: 0, width: 200, height: 43)

let rightBarButton = UIBarButtonItem(customView: tabBar)
self.navigationItem.leftBarButtonItems = [rightBarButton]]

**My target Design:**

**Result I am getting:**