Unable to navigate to specific viewController after clicking push notification in foreground using FCM below iOS 10 - ios

Question

I am trying to get the notification in foreground as well as in background, i am getting notification in both states, but i'm unable to navigate it to desired view controller after tapping the notification when app is in foreground, Any help will be highly appreciated, thanks in advance
i am using third party for custom banner, running on iphone 4s device, ios 9
func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any]) {
// If you are receiving a notification message while your app is in the background,
// this callback will not be fired till the user taps on the notification launching the application.
// TODO: Handle data of notification
// With swizzling disabled you must let Messaging know about the message, for Analytics
Messaging.messaging().appDidReceiveMessage(userInfo)
print("In did Recieve Notification")
// Print message ID.
print("userInfoNotification=\(userInfo)")
if let contactID = userInfo["contactID"] as? String {
self.contactID = contactID
print(contactID)
}
let state = UIApplication.shared.applicationState
if state == .active {
print("App in Foreground")
if self.contactID != AppDelegate.openedChatContactId {
print("openedID=\(AppDelegate.openedChatContactId)")
if let aps = userInfo["aps"] as? NSDictionary {
if let alert = aps["alert"] as? NSDictionary {
let body = alert["body"] as! String
let title = alert["title"] as! String
let banner = Banner(title: title, subtitle: body, image: UIImage(named: "AppIcon"), backgroundColor: UIColor(red:31.00/255.0, green:136.0/255.0, blue:254.5/255.0, alpha:1.000))
banner.dismissesOnTap = true
banner.show(duration: 3.0)
// let storyboard = UIStoryboard(name: "Main", bundle: nil)
// let viewController = storyboard.instantiateViewController(withIdentifier: "chatMessageVC") as! ChatMessagesVC
// UIApplication.shared.keyWindow?.rootViewController = viewController;
} else if let alert = aps["alert"] as? NSString {
}
}
}
}
if state == .inactive || state == .background {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
var destinationViewController = storyboard.instantiateViewController(withIdentifier: "chatMessageVC") as! ChatMessagesVC
UserDefaults.standard.set(contactID, forKey: "contactID")
UserDefaults.standard.synchronize()
destinationViewController.contactID = self.contactID
let navigationController = self.window?.rootViewController as! UINavigationController
navigationController.pushViewController(destinationViewController, animated: false)
}
}

Answer 1

Implement below extension of UIApplication
extension UIApplication {
class func topViewController(controller: UIViewController? = UIApplication.shared.keyWindow?.rootViewController) -> UIViewController? {
if let navigationController = controller as? UINavigationController {
return topViewController(controller: navigationController.visibleViewController)
}
if let tabController = controller as? UITabBarController {
if let selected = tabController.selectedViewController {
return topViewController(controller: selected)
}
}
if let presented = controller?.presentedViewController {
return topViewController(controller: presented)
}
return controller
}
}
Please change your code to navigate to specific screen while app is in foreground.
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let viewController = storyboard.instantiateViewController(withIdentifier: "chatMessageVC") as! ChatMessagesVC
UIApplication.topViewController()?.navigationController?.pushViewController(viewController, animated: false)
Hope this finds you well and let me know in case of any queries.
UPDATE
If the application is running in the foreground, iOS won't show a notification banner/alert. That's by design. But we can achieve it by using UILocalNotification as follows
if application.applicationState == .active {
var localNotification = UILocalNotification()
localNotification.userInfo = userInfo
localNotification.soundName = UILocalNotificationDefaultSoundName
localNotification.alertBody = message
localNotification.fireDate = Date()
UIApplication.shared.scheduleLocalNotification(localNotification)
}