Cai dat Push ios

    // iOS 10 support

        if #available(iOS 10, *) {

            UNUserNotificationCenter.current().requestAuthorization(options:[.badge, .alert, .sound]){ (granted, error) in }

            application.registerForRemoteNotifications()

        }

        // iOS 9 support

        if #available(iOS 9, *) {

            UIApplication.shared.registerUserNotificationSettings(UIUserNotificationSettings(types: [.badge, .sound, .alert], categories: nil))

            UIApplication.shared.registerForRemoteNotifications()

        }

        // iOS 8 support

        if #available(iOS 8, *) {

            UIApplication.shared.registerUserNotificationSettings(UIUserNotificationSettings(types: [.badge, .sound, .alert], categories: nil))

            UIApplication.shared.registerForRemoteNotifications()

        }

            // iOS 7 support

        else {

            application.registerForRemoteNotifications(matching: [.badge, .sound, .alert])

        }