To implement Notification in iOS 10, follow below steps.

Go to Project -> Target -> capabilities -> push notifications
enable push notification.

Now in Your AppDelegate Class do following steps -

1. Import UserNotifications.
2. Assign “UNUserNotificationCenterDelegate“ Delegate to this class.

import UserNotifications

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate,UNUserNotificationCenterDelegate

3. In didFinishLaunchingWithOptions method implement “UNUserNotificationCenter” delegate and “UIUserNotificationSettings”.

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        
        // Override point for customization after application launch.
        let center = UNUserNotificationCenter.current()
        center.delegate = self
        center.requestAuthorization(options: [.alert, .sound, .badge]) { (granted, error) in
            // Enable or disable features based on authorization.
            if granted == true
            {
                UIApplication.shared.registerForRemoteNotifications()
            }}
        return true
    }

4.Now implement delegate methods of “UNUserNotificationCenter”

// The method will be called when application is in the foreground.
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
        //You can set notification presented as a sound, badge, alert and/or in the notification list.
        completionHandler(UNNotificationPresentationOptions.alert)
    }

// The method will be called when the user tap on the notification by opening the application, dismissing the notification or choosing a UNNotificationAction.
func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Swift.Void){
        // Handle response accordingly. 

    }