Swift Writing to and Accessing Class Objects - ios

Question

So I am trying to use MapKit to put a series of points into a map. Ultimitely I am going to get a list of datapoints from csv and load them into the Location Class, then read them from the Class as MapView Annotations. This works here individually for plotting 2 points manually ...but I can't figure out how to properly load and access Location class for a number of items (10 Location Points for example)
Here is my class file
import Foundation
import MapKit
class Location: NSObject, MKAnnotation{
let title: String?
let locationName: String
let discipline: String
let coordinate: CLLocationCoordinate2D
init(title: String, locationName: String, lat: String, lon: String){
self.title = title
self.locationName = locationName
let latDouble = (lat as NSString).doubleValue
let lonDouble = (lon as NSString).doubleValue
let latlong = CLLocationCoordinate2D(latitude: latDouble, longitude: lonDouble)
self.discipline = locationName
self.coordinate = latlong
super.init()
}
}
here is ViewController.swift
import UIKit
import MapKit
class ViewController: UIViewController, MKMapViewDelegate {
//var stops = TransitStop[]()
let initialLocation = CLLocation( latitude: 41.880632, longitude: -87.623277)
#IBOutlet weak var mapView: MKMapView!
let regionRadius: CLLocationDistance = 1000
override func viewDidLoad() {
super.viewDidLoad()
let initial = Location(title: "YOU", locationName: "are here", lat: "41.880632", lon: "-87.623277")
let firstStop = Location(title: "ashland", locationName: "ashland", lat: "41.88574", lon: "-87.627835")// Do any additional setup after loading the view, typically from a nib.
centerMapOnLocation(location: initialLocation)
mapView.addAnnotation(initial)
mapView.addAnnotation(firstStop)
}
func centerMapOnLocation(location: CLLocation) {
let coordinateRegion = MKCoordinateRegionMakeWithDistance(location.coordinate, regionRadius * 2.0, regionRadius * 2.0)
mapView.setRegion(coordinateRegion, animated: true)
}
}

Answer 1

Try something like this:
var locationArray: [Location] = []
for line in csvString{
let values:[String] = line.components(separatedBy: ",")
let title = values[0]
let locationName = values[1]
let lat = values[2]
let lng = values[3]
let latD: Double = Double(lat)
let lngD: Double = Double(lng)
let location = Location(title: title, locationName: locationName, lat: latD, lng: lngD)
locationArray.append(location)
}
centerMapOnLocation(location: initialLocation)
addLocationsToMap(locationArray: locationArray)
Make sure you do some validating on the values (Double) before implementing.
Then you can read the location into the map with this function:
func addLocationsToMap(locationArray: [Location]){
for location in locationArray {
mapView.addAnnotation(location)
}
}
Note: I realize the OP doesn't need to explicitly define the variables. I just thought it would be easier to understand.
I assume the csv value can be read from an array perhaps and that the placement of the values in the csv file for 'title', 'loacationName' are well defined.