Swift: Change the tabBar icon from appDelegate - swift

Question

I would like to change an icon of my tabbar from the appDelegate.
I will explain why I want to do that.
From my website I send data by push to my application, so in the appdelegate I recieve the data in the function didReceiveRemoteNotification, with these data I create a local notification manually. I would also like to be able to modify the icon of my TabBar to show that there is a new notification.
So how to change the icon of the tabbar from the app delegate?
Here is a photo of my app, the green circle is the part that means "New notification"
My App images
Here my code in appdelegate:
func application(_ application: UIApplication, didReceiveRemoteNotification data: [AnyHashable: Any]) {
if let data = data as? NSDictionary {
print("Title: \(data)")
LocalNotification.createLocalNotificationWithIntervals(identifier: "Push",
title: data["title"] as! String,
body: data["body"] as! String,
intervals: 1) { error in
guard error == nil else {
print("Error: \(error!.localizedDescription)")
return
}
print("Successfully execute notification")
}
}
}
I user a tabor controller:
class FittoTabBarController: UITabBarController {
let kImageNoLabelInset: CGFloat = 6.0
var selectedTab: FittoTabBar.Tabs = .pods {
didSet {
selectedIndex = selectedTab.rawValue
}
}
override func viewDidLoad() {
super.viewDidLoad()
selectedTab = .pods
removeItemsTitles()
}
override func tabBar(_ tabBar: UITabBar, didSelect item: UITabBarItem) {
guard let selectedItemIndex = tabBar.items?.index(of: item),
let selectedTab = FittoTabBar.Tabs(rawValue: selectedItemIndex) else {
return
}
self.selectedTab = selectedTab
}
private func removeItemsTitles() {
if let items = self.tabBar.items {
for item in items {
item.title = ""
item.imageInsets = UIEdgeInsets(top: kImageNoLabelInset, left: 0.0, bottom: -kImageNoLabelInset, right: 0.0)
}
}
}
The input of my application is on the tabbar controller

Answer 1

With the code provided above, You need to follow these steps to make it working.
In your FittoTabBarController add these methods.
func setBadge(_ value: String?) {
_ = self.viewControllers![2].tabBarItem.badgeValue = value
}
func getBadge() -> String? {
return self.viewControllers![2].tabBarItem.badgeValue
}
func resetBadge() {
self.viewControllers![2].tabBarItem.badgeValue = nil
}
In your appDelegate, get the rootViewController of your window, on receiving notification
func application(_ application: UIApplication, didReceiveRemoteNotification data: [AnyHashable: Any]) {
if let data = data as? NSDictionary {
print("Title: \(data)")
let myTabBarController = self.window?.rootViewController as! FittoTabBarController
var newBadgeCount = "1"
if let currentBadgeCount = myTabBarController.getBadge() {
// Convert to int
var intValOfCurrentBadge = Int(currentBadgeCount)!
// Increaset it by one.
intValOfCurrentBadge = intValOfCurrentBadge + 1
// Convert back to string.
newBadgeCount = "\(intValOfCurrentBadge)"
}
// Set your badge value here.
myTabBarController.setBadge(newBadgeCount)
// ADD YOUR EXISTING CODE HERE
}
}
when user clicks on the 3rd tab, just call the resetBadge() method to remove the badge count.
Hope it helps.