AppDelegate.swift

    func application(application: UIApplication, handleWatchKitExtensionRequest userInfo: [NSObject : AnyObject]?, reply: (([NSObject : AnyObject]!) -> Void)!) {
        
        // Begin background task, recommended by apple so your app doesnt get terminated by the system for taking too long to complete the network task
        var identifier : UIBackgroundTaskIdentifier!
        identifier =  UIApplication.sharedApplication().beginBackgroundTaskWithName("Hello", expirationHandler: { () -> Void in
            
            UIApplication.sharedApplication().endBackgroundTask(identifier)
            identifier = UIBackgroundTaskInvalid
        })

        
        let request = userInfo!["request"] as! String
        
        if(request == "getRandomLocation"){
            // Get GPS Location
            var locationManager = LocationManager.sharedInstance
            locationManager.showVerboseMessage = true
            locationManager.autoUpdate = false
            locationManager.startUpdatingLocationWithCompletionHandler { (latitude, longitude, status, verboseMessage, error) -> () in
                
                if (error != nil) {
                    self.returnErrorMessage(reply, errorMessage: "No GPS location found. Turn on location services on your iPhone.")
                    UIApplication.sharedApplication().endBackgroundTask(identifier)
                    identifier = UIBackgroundTaskInvalid
                    return
                }
                
                // Call my API
                var placeManager = PlaceManager()
                placeManager.loadRandomLoaction(latitude, longitude: longitude) { ( place:Place?, error:String?) -> () in
                    
                    if (error != nil) {
                        self.returnErrorMessage(reply, errorMessage: "Ohhps. We could not find any location near your.")
                        UIApplication.sharedApplication().endBackgroundTask(identifier)
                        identifier = UIBackgroundTaskInvalid
                        return
                    }
                    
                    if (place != nil)  {
                        
                        var simplePlace = SimplePlace()
                        simplePlace.name = place?.name
                        simplePlace.category = place?.category
                        simplePlace.distance = place?.distance
                        
                        simplePlace.longitude = place?.location.longitude
                        simplePlace.latitude = place?.location.latitude
                        
                        simplePlace.image_url = place?.image_url
                        simplePlace.small_image_url = place?.small_blurred_image_url
                        simplePlace.small_blurred_image_url = place?.small_blurred_image_url
                        
                        var returnResult : [String:AnyObject] = ["response":"place","data":NSKeyedArchiver.archivedDataWithRootObject(simplePlace)]
                        reply(returnResult)
                        UIApplication.sharedApplication().endBackgroundTask(identifier)
                        identifier = UIBackgroundTaskInvalid
                        return
                    }
                }
                
            }

        } else {
            self.returnErrorMessage(reply, errorMessage: "Ohhps. Something went terrible wrong.")
            UIApplication.sharedApplication().endBackgroundTask(identifier)
            identifier = UIBackgroundTaskInvalid
        }
    }

locationmanger.swift

@see https://github.com/varshylmobile/LocationManager

StartInterfaceController

       
        WKInterfaceController.openParentApplication(["request": "getRandomLocation"],
            reply: { (replyInfo, error) -> Void in
                
                self.hideLoader()
                
                let response = replyInfo["response"] as! String
                
                if (response == "place") {
                    let data = replyInfo["data"] as! NSData
                    let place = NSKeyedUnarchiver.unarchiveObjectWithData(data) as! SimplePlace
                    self.pushControllerWithName(WatchStoryboard.InterfaceControllerIdentifiers.placeViewController, context: place)
                } else /* if (response == "error") */ {
                    self.pushControllerWithName(WatchStoryboard.InterfaceControllerIdentifiers.alertViewController, context: replyInfo["message"])
                    return
                }
        })