Update badge of non selected tabBarItem in Swift

Question

I have a navigation controller with 4 tab bar items. Each one has a navigation controller inside. I want to be able to change the 4th tab bar badge number when I get push notifi

Answer 1

extension UITabBarController {
    func increaseBadge(indexOfTab: Int, num: String) {
        let tabItem = tabBar.items![indexOfTab]
        tabItem.badgeValue = num
    } 
}

and you can call it like this:

self.tabBarController?.increaseBadge(indexOfTab: 3, num: "34")