TabBarController

TabBarController

import UIKit

class TabBarController: UITabBarController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // add badge to my cart tab icon with value of zero
        self.tabBar.items![0].badgeValue = "0"
        createObservers()
    }
    
    func createObservers() {
        NotificationCenter.default.addObserver(self, selector: #selector(TabBarController.setBadge(notification:)), name: addItemNotfication, object: nil)
    }
    
    @objc func setBadge(notification: NSNotification) {
        //get the existant badge value
        let badgeValue = Int(self.tabBar.items![0].badgeValue!)!
        // set the new badge value
        self.tabBar.items![0].badgeValue = "\(badgeValue + 1)"
    }
}