针对Swift 4.2的更新

import UserNotifications

在AppDelegate中确认UNUserNotificationCenterDelegate，在didFinishLaunchingWithOptions中确认

let center = UNUserNotificationCenter.current()
            center.delegate = self;
            center.requestAuthorization(options: [UNAuthorizationOptions.alert, .badge, .sound]) { (granted, error) in
                if !granted {
                    print("Permission Declined");
                }
            }

let content = UNMutableNotificationContent();
            content.title = "HI";
            content.body = "Your notification is here";
            content.sound = UNNotificationSound.default;

            let gregorian = Calendar(identifier: Calendar.Identifier.gregorian);
            let now = Date();
            var components = gregorian.dateComponents(in: .autoupdatingCurrent, from: now)

            let hours = [8,19];

            for hour in hours {
                components.timeZone = TimeZone.current
                components.hour = hour;
                components.minute = 00;
                components.second = 00;

                let date = gregorian.date(from: components);
                let formatter = DateFormatter();
                formatter.dateFormat = "MM-dd-yyyy HH:mm";

                guard let dates = date else {
                    return;
                }
                var fireDate: String? 
                fireDate = formatter.string(from: dates);
                print("\(fireDate ?? "")"); // Just to Check

                let dailyTrigger = Calendar.current.dateComponents([.hour, .minute, .second], from: dates);
                let trigger = UNCalendarNotificationTrigger.init(dateMatching: dailyTrigger, repeats: true);

                let identifier = "Local Notification"
                let request = UNNotificationRequest(identifier: identifier, content: content, trigger: trigger)

                center.add(request) { (error) in
                    if let error = error {
                        print("Error \(error.localizedDescription)")
                    }
                }
            }

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    // Override point for customization after application launch.
    let settings = UIUserNotificationSettings(forTypes: .Badge, categories: nil)
    UIApplication.sharedApplication().registerUserNotificationSettings(settings)

    let localNotification1 = UILocalNotification()
    localNotification1.alertBody = "Your alert message 111"
    localNotification1.timeZone = NSTimeZone.defaultTimeZone()
    localNotification1.fireDate = self.getEightAMDate()
    UIApplication.sharedApplication().scheduleLocalNotification(localNotification1)

    let localNotification2 = UILocalNotification()
    localNotification2.alertBody = "Your alert message22"
    localNotification2.timeZone = NSTimeZone.defaultTimeZone()
    localNotification2.fireDate = self.getSevenPMDate()
    UIApplication.sharedApplication().scheduleLocalNotification(localNotification2)
    return true
}

func getEightAMDate() -> NSDate? {
    let calendar: NSCalendar! = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)
    let now: NSDate! = NSDate()

    let date10h = calendar.dateBySettingHour(8, minute: 0, second: 0, ofDate: now, options: NSCalendarOptions.MatchFirst)!
    return date10h
}

func getSevenPMDate() -> NSDate? {
    let calendar: NSCalendar! = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)
    let now: NSDate! = NSDate()

    let date19h = calendar.dateBySettingHour(19, minute: 0, second: 0, ofDate: now, options: NSCalendarOptions.MatchFirst)!
    return date19h
}