Example of Working with Push Notifications

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
 
    // Reset notifications counter after application start
    UIApplication.shared.applicationIconBadgeNumber = 0
 
    // Register sending of push notifications
    self.registerForPushNotifications()
 
    // Set up conditions for displaying push notifications
    if let notification = launchOptions?[UIApplication.LaunchOptionsKey.remoteNotification] as? [String: AnyObject] {
        print(notification)
    }
    return true
}
 
func registerForPushNotifications() {
    UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound, .badge]) { (granted, error) in
        print("Permission granted: \(granted)")
        guard granted else { return }
        self.getNotificationSettings()
    }
}
 
func getNotificationSettings() {
    UNUserNotificationCenter.current().getNotificationSettings { (settings) in
        print("Notification settings: \(settings)")
        guard settings.authorizationStatus == .authorized else { return }
        DispatchQueue.main.async {
            UIApplication.shared.registerForRemoteNotifications()
        }
    }
}
 
func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
 
    // Get mobile device token
    let tokenParts = deviceToken.map { data in String(format: "%02.2hhx", data) }
    let token = tokenParts.joined()
    print("Device Token: \(token)")
 
    // Fix token in UserDefaults
    UserDefaults.standard.set(token, forKey: "TokenUserDefaultsKey")
}
 
func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) {
    print("Failed to register: \(error)")
}
 
func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
    let aps = userInfo["aps"] as! [String: AnyObject]
    print(aps)
}

import UIKit
 
class ViewController: UIViewController {
 
    // Determine output variables
    @IBOutlet weak var topicTextField: UITextField!
    @IBOutlet weak var resultTextView: UITextView!
    @IBOutlet weak var getTokensButton: UIButton!
    @IBOutlet weak var addTokenButton: UIButton!
    @IBOutlet weak var removeTokensButton: UIButton!
    @IBOutlet weak var getTopicsButton: UIButton!
    @IBOutlet weak var subscribeButton: UIButton!
    @IBOutlet weak var unsubscribeButton: UIButton!
 
    // Redetermine method
    override func viewDidLoad() {
        super.viewDidLoad()
        self.deactivateButtons()
        self.initializeFramework()
        self.auth {
            self.activateButtons()
            self.resultTextView.text = "Authentication success"
        }
    }
 
    // Set method that will be executed on button click
    @IBAction func getTokensPressed() {
        self.getTokens { (jsonResult) in
            self.resultTextView.text = String(format: "%@", jsonResult)
        }
    }
 
    @IBAction func addTokenPressed() {
        self.addToken { (jsonResult) in
            self.resultTextView.text = String(format: "%@", jsonResult)
        }
    }
 
    @IBAction func removeTokensPressed() {
        self.removeToken { (jsonResult) in
            self.resultTextView.text = String(format: "%@", jsonResult)
        }
    }
 
    @IBAction func getTopicsPressed() {
        self.getTopics { (jsonResult) in
            self.resultTextView.text = String(format: "%@", jsonResult)
        }
    }
 
    @IBAction func subscribePressed() {
        self.subscribe { (jsonResult) in
            self.resultTextView.text = String(format: "%@", jsonResult)
        }
    }
 
    @IBAction func unsubscribePressed() {
        self.unsubscribe { (jsonResult) in
            self.resultTextView.text = String(format: "%@", jsonResult)
        }
    }
 
    @IBAction func viewTapped(_ sender: UITapGestureRecognizer) {
        self.topicTextField.resignFirstResponder()
    }
 
    // Initialize framework
    private func initializeFramework() {
        let apiVersion: String = "v1"
        let host: String = "http://testmasterfmp.fsight.cloud/"
        let environment: String = "Leonid_environment"
        let project: String = "Leonid_project"
        let device: String = (UIDevice.current.identifierForVendor?.uuidString)!
        HHFWController.sharedInstance().initWithCredentials(
            apiVersion,
            host: host,
            environment: environment,
            project: project,
            device: device
        )
    }
 
    // Authenticate
    private func auth(completion: @escaping ()->()) {
        let username: String = "Leonid"
        let password: String = "123123"
        HHFWController.sharedInstance().auth(username, password: password){ (jsonResult) in
            if let jsonDict = jsonResult as? NSDictionary,
                let status = jsonDict["status"] as? String, status == "ok" {
                print("Auth success")
                completion()
            } else {
                print("Auth error")
            }
        }
    }
 
    // Get mobile device token
    private func getTokens(completion: @escaping (NSDictionary)->()) {
        HHFWController.sharedInstance().getTokens { (jsonResult) in
            if let jsonDict = jsonResult as? NSDictionary,
                let status = jsonDict["status"] as? String, status == "ok" {
                print("Get tokens success")
                completion(jsonDict)
            } else {
                print("Get tokens error")
            }
        }
    }
 
    // Send token to a mobile platform server
    private func addToken(completion: @escaping (NSDictionary)->()) {
        guard let token = UserDefaults.standard.string(forKey: "TokenUserDefaultsKey") else { return }
        let service: String = "apns"
        HHFWController.sharedInstance().addToken(token, service: service) { (jsonResult) in
            if let jsonDict = jsonResult as? NSDictionary,
                let status = jsonDict["status"] as? String, status == "ok" {
                print("Add token success")
                completion(jsonDict)
            } else {
                print("Add token error")
            }
        }
    }
 
    // Remove token from a mobile platform server
    private func removeToken(completion: @escaping (NSDictionary)->()) {
        guard let token = UserDefaults.standard.string(forKey: "TokenUserDefaultsKey") else { return }
        HHFWController.sharedInstance().removeTokens([token]) { (jsonResult) in
            if let jsonDict = jsonResult as? NSDictionary,
                let status = jsonDict["status"] as? String, status == "ok" {
                print("Remove tokens success")
                completion(jsonDict)
            } else {
                print("Remove tokens error")
            }
        }
    }
 
    // Get list of available message topics
    private func getTopics(completion: @escaping (NSDictionary)->()) {
        HHFWController.sharedInstance().getTopics { (jsonResult) in
            if let jsonDict = jsonResult as? NSDictionary,
                let status = jsonDict["status"] as? String, status == "ok" {
                print("Get topics success")
                completion(jsonDict)
            } else {
                print("Get topics error")
            }
        }
    }
 
    // Subscribe to receive messages with specific topic
    private func subscribe(completion: @escaping (NSDictionary)->()) {
        guard let topic = self.topicTextField.text else { return }
        HHFWController.sharedInstance().subscribeTopics([topic]) { (jsonResult) in
            if let jsonDict = jsonResult as? NSDictionary,
                let status = jsonDict["status"] as? String, status == "ok" {
                print("Subscribe topics success")
                completion(jsonDict)
            } else {
                print("Subscribe topics error")
            }
        }
    }
 
    // Unsubscribe from receiving messages with specific topic
    private func unsubscribe(completion: @escaping (NSDictionary)->()) {
        guard let topic = self.topicTextField.text else { return }
        HHFWController.sharedInstance().unsubscribeTopics([topic]) { (jsonResult) in
            if let jsonDict = jsonResult as? NSDictionary,
                let status = jsonDict["status"] as? String, status == "ok" {
                print("Unsubscribe topics success")
                completion(jsonDict)
            } else {
                print("Unsubscribe topics error")
            }
        }
    }
 
    // Set methods to display application user interface elements
    private func deactivateButtons() {
        self.getTokensButton.isEnabled = false
        self.addTokenButton.isEnabled = false
        self.removeTokensButton.isEnabled = false
        self.getTopicsButton.isEnabled = false
        self.subscribeButton.isEnabled = false
        self.unsubscribeButton.isEnabled = false
    }
 
    private func activateButtons() {
        self.getTokensButton.isEnabled = true
        self.addTokenButton.isEnabled = true
        self.removeTokensButton.isEnabled = true
        self.getTopicsButton.isEnabled = true
        self.subscribeButton.isEnabled = true
        self.unsubscribeButton.isEnabled = true
    }
}