Opening ViewController In AppDelegate While Keeping Tabbar

Question

In my Xcode project when a user taps on a notification I want to first send them to a certain item in my tabBar then I want to instantiate a view controller and send an obje

Answer 1

First of all, you'll to insatiate a TabBarController:

let storyboard = UIStoryboard.init(name: "YourStoryboardName", bundle: nil)
let tabBarController = storyboard.instantiateViewController(withIdentifier: "YourTabBarController") as! UITabBarController

And then insatiate all of the viewControllers of TabBarController. If your viewControllers is embedded in to the UINavigationController? If so, you'll to insatiate a Navigation Controller instead:

let first = storyboard.instantiateViewiController(withIdentifier: "YourFirstNavigationController") as! UINavigationController
let second = storyboard.instantiateViewiController(withIdentifier: "YourSecondNavigationController") as! UINavigationController
let third = storyboard.instantiateViewiController(withIdentifier: "YourThirdNavigationController") as! UINavigationController

Also you should instantiate your desired ViewController too:

let desiredVC = storyboard.instantiateViewController(withIdentifier: "desiredVC") as! ExampleDesiredViewController

Make all of the NavigationControllers as viewControllers of TabBarController:

tabBarController.viewControllers = [first, second, third]

And check: It's about your choice.

if tabBarController.selectedViewController == first {

// Option 1: If you want to present
first.present(desiredVC, animated: true, completion: nil)

// Option 2: If you want to push
first.pushViewController(desiredVC, animated. true)

}

Make tabBarController as a rootViewController:

self.window = UIWindow.init(frame: UIScreen.main.bounds)   
self.window?.rootViewController = tabBarController
self.window?.makeKeyAndVisible()

Finally: It's your completed code:

func openViewController() {

let storyboard = UIStoryboard.init(name: "YourStoryboardName", bundle: nil)
let tabBarController = storyboard.instantiateViewController(withIdentifier: "YourTabBarController") as! UITabBarController

let first = storyboard.instantiateViewiController(withIdentifier: "YourFirstNavigationController") as! UINavigationController
let second = storyboard.instantiateViewiController(withIdentifier: "YourSecondNavigationController") as! UINavigationController
let third = storyboard.instantiateViewiController(withIdentifier: "YourThirdNavigationController") as! UINavigationController

let desiredVC = storyboard.instantiateViewController(withIdentifier: "desiredVC") as! ExampleDesiredViewController

tabBarController.viewControllers = [first, second, third]

if tabBarController.selectedViewController == first {

// Option 1: If you want to present
first.present(desiredVC, animated: true, completion: nil)

// Option 2: If you want to push
first.pushViewController(desiredVC, animated. true)

}

self.window = UIWindow.init(frame: UIScreen.main.bounds)   
self.window?.rootViewController = tabBarController
self.window?.makeKeyAndVisible()

}

If you want to present or push ViewController when the notification is tapped? Try something like that:

extension AppDelegate: UNUserNotificationCenterDelegate {

func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {

        switch response.actionIdentifier {
        case UNNotificationDefaultActionIdentifier:
            openViewController()
            completionHandler()

        default:
            break;
        }
    }
}