Xcode 7.2.1 Swift 2.1.1
You just have to set the badgeValue for your desired UITabBarItem as follow:
tabBarController?.tabBar.items?[4].badgeValue = "1" // this will add "1" badge to your fifth tab bar item
// or like this to apply it to your first tab
tabBarController?.tabBar.items?.first?.badgeValue = "1st"
// or to apply to your second tab
tabBarController?.tabBar.items?[1].badgeValue = "2nd"
// to apply it to your last tab
tabBarController?.tabBar.items?.last?.badgeValue = "Last"
To remove a badge from the UITabBarItem just add nil value to it
tabBarController?.tabBar.items?.first?.badgeValue = nil
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