Finding the specific venue at a current location using foursquare API in swift

Question

I'm newer to coding in swift and I'm working on finding a specific venue that corresponds to my current location using the foursquare API in the swift language. I've got it down to a cluster of venues around my location, but it only works sometimes when I run the simulator. Can someone please help me out? I have two ViewControllers. The first one:

import Foundation

import UIKit

import CoreLocation

let API_URL = "https://api.foursquare.com/v2/"

let CLIENT_ID = ""

let CLIENT_SECRET = ""

class FourSquareRequest: NSObject {

class func requestVenuesWithLocation(location: CLLocation) -> [AnyObject] {

let requestString = "\(API_URL)venues/search?client_id=\(CLIENT_ID)&client_secret=\(CLIENT_SECRET)&v=20130815&ll=\(location.coordinate.latitude),\(location.coordinate.longitude)"

println(requestString)

if let url = NSURL(string: requestString) {

    let request = NSURLRequest(URL: url)

    if let data = NSURLConnection.sendSynchronousRequest(request, returningResponse: nil, error: nil) {

        if let returnInfo = NSJSONSerialization.JSONObjectWithData(data, options: .MutableContainers, error: nil) as? [String:AnyObject] {

            let responseInfo = returnInfo["response"] as [String:AnyObject]

            let venues = responseInfo["venues"] as [[String:AnyObject]]

            return venues

        }



    }



}


return []

} }

And the second ViewController:

import UIKit

import MapKit

import CoreLocation

var onceToken: dispatch_once_t = 0

class VenueViewController: UIViewController, CLLocationManagerDelegate {

var lManager = CLLocationManager() var mapView = MKMapView()

override func viewDidLoad() { super.viewDidLoad()

mapView.frame = view.frame
view.addSubview(mapView)

lManager.requestWhenInUseAuthorization()

lManager.delegate = self

lManager.desiredAccuracy = kCLLocationAccuracyBest
lManager.distanceFilter = kCLDistanceFilterNone

lManager.startUpdatingLocation()

}

func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {

dispatch_once(&onceToken) { () -> Void in

    println(locations.last)

    if let location = locations.last as? CLLocation {

        let span = MKCoordinateSpanMake(0.1, 0.1)
        let region = MKCoordinateRegion(center: location.coordinate, span: span)

        self.mapView.setRegion(region, animated: true)

        let venues = FourSquareRequest.requestVenuesWithLocation(location)

        println(venues)

        self.createAnnotationsWithVenues(venues)

        // request to foursquare for venues with location

    }

}

lManager.stopUpdatingLocation()

}

func createAnnotationsWithVenues(venues: [AnyObject]) {

for venue in venues as [[String:AnyObject]] {

    let locationInfo = venue["location"] as [String:AnyObject]

    let lat = locationInfo["lat"] as CLLocationDegrees
    let lng = locationInfo["lng"] as CLLocationDegrees

    let coordinate = CLLocationCoordinate2DMake(lat, lng)

    let annotation = MKPointAnnotation()
    annotation.setCoordinate(coordinate)

    mapView.addAnnotation(annotation)

}

} }

Welcome to the Treehouse Community

Looking to learn something new?

Daniel Merrill

Daniel Merrill

Finding the specific venue at a current location using foursquare API in swift