How to create a location-based iOS Today Extension using Swift

LocationTodayExtension.swift

//
//  TodayViewController.swift
//  LocationTodayExtension
//
//  Created by Pete Smith on 24/03/2016.
//  Copyright © 2016 Pete Smith. All rights reserved.
//

import UIKit
import NotificationCenter
import CoreLocation

class TodayViewController: UIViewController {
    
    // This is used to indicate whether an update of the today widget is required or not
    private var updateResult = NCUpdateResult.NoData
    
    lazy private var locman = CLLocationManager()
        
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view from its nib.
        
        locman.delegate = self
    }
    
    override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)
        
        locman.startUpdatingLocation()
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
    // Update our display
    func updateDisplay() {
        //...
    }

}

typealias WidgetProvider = TodayViewController
extension WidgetProvider: NCWidgetProviding {
    
    func widgetPerformUpdateWithCompletionHandler(completionHandler: ((NCUpdateResult) -> Void)) {
        // Perform any setup necessary in order to update the view.
        
        // If an error is encountered, use NCUpdateResult.Failed
        // If there's no update required, use NCUpdateResult.NoData
        // If there's an update, use NCUpdateResult.NewData
        
        completionHandler(updateResult)
    }
}

typealias LocationDelegate = TodayViewController
extension LocationDelegate: CLLocationManagerDelegate {
    func locationManager(manager: CLLocationManager, didFailWithError error: NSError) {
        // If we could not retrive location data, set our update result to Failed
        updateResult = .Failed
    }
    
    func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        // Do stuff with the retrieved location, update our display and then set our update result to NewData
        updateDisplay()
        updateResult = .NewData
        
    }
}