Increment tab bar badge w/ UIAlertAction swift?

Question

@IBAction func addToCart(sender: AnyObject) {
    let itemObjectTitle = itemObject.valueForKey(\"itemDescription\") as! String
    let alertController = UIAlertContr         


        

Answer 1

You can try to access the badgeValue and convert it to Integer as follow:

Swift 2

if let badgeValue = tabBarController?.tabBar.items?[1].badgeValue,
    nextValue = Int(badgeValue)?.successor() {
    tabBarController?.tabBar.items?[1].badgeValue = String(nextValue)
} else {
    tabBarController?.tabBar.items?[1].badgeValue = "1"
}

Swift 3 or later

    if let badgeValue = tabBarController?.tabBar.items?[1].badgeValue,
        let value = Int(badgeValue) {
        tabBarController?.tabBar.items?[1].badgeValue = String(value + 1)
    } else {
        tabBarController?.tabBar.items?[1].badgeValue = "1"
    }

To delete the badge just assign nil to the badgeValue overriding viewDidAppear method:

override func viewDidAppear(animated: Bool) {
    tabBarController?.tabBar.items?[1].badgeValue = nil
}

Answer 2

Works with Swift 2:

            let tabController = UIApplication.sharedApplication().windows.first?.rootViewController as? UITabBarController
            let tabArray = tabController!.tabBar.items as NSArray!
            let alertTabItem = tabArray.objectAtIndex(2) as! UITabBarItem


            if let badgeValue = (alertTabItem.badgeValue) {
                let intValue = Int(badgeValue)
                alertTabItem.badgeValue = (intValue! + 1).description
                print(intValue)
            } else {
                alertTabItem.badgeValue = "1"
            }