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iOS

Posted by Antoine Streiff
Antoine Streiff
4,649 Points

Mapbox and POI in a dictionnary nested in an array

I'm dealing with a mapbox view (MGLMapView) with the Mapbox framework.

I'm trying to populate a map with POIs. I've stored the GPS coordinates in an array. However, I don't really how to, well, to put it in my own words, "create a constant for each value of the dictionary".

So far I've done a for loop :

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    let dicoInterest = (dictionnaireMap["GPS"]!["interest"] as! NSArray)



    let pointDepart = MGLPointAnnotation()
    let latitudeDepart = (dictionnaireMap["GPS"]!["latitude"] as! Double)
    let longitudeDepart = (dictionnaireMap["GPS"]!["longitude"] as! Double)
    let zoom = (dictionnaireMap["GPS"]!["zoom"] as! Double)
    pointDepart.coordinate = CLLocationCoordinate2D(latitude: latitudeDepart, longitude: longitudeDepart)

    self.title = (dictionnaireMap["titre"] as! String)
    mapViewOutlet.setCenterCoordinate(CLLocationCoordinate2D(latitude: latitudeDepart, longitude: longitudeDepart), zoomLevel: zoom, animated: false)
    mapViewOutlet.addAnnotation(pointDepart)


    for arrayInterest in dicoInterest {

        let point = MGLPointAnnotation()
        var latitudePoint : Double
        var longitudePoint : Double
        latitudePoint = (arrayInterest["latitude"] as! Double)
        longitudePoint = (arrayInterest["longitude"] as! Double)
        point.coordinate = CLLocationCoordinate2D(latitude: latitudePoint, longitude: longitudePoint)


        print("latitude : \(latitudePoint)")
        print("longitude : \(longitudePoint)")


    }

}

The coordinates print well, but no point in view. 

latitude : -38.96459
longitude : 146.35114
latitude : -38.96458
longitude : 146.35113

Any idea ?

2 Answers

Alex Millius
.a{fill-rule:evenodd;}techdegree
Alex Millius
iOS Development Techdegree Student 5,468 Points

Hi,

Maybe you could create a variable array of MGLPointAnnotation outside of your loop.

And each time you create your point, affect it to your array of MGLPointAnnotation.

Something like:

var myArrayOfMGLPointAnnotation = [MGLPointAnnotation]

for arrayInterest in dicoInterest {

        let point = MGLPointAnnotation()
        var latitudePoint : Double
        var longitudePoint : Double
        latitudePoint = (arrayInterest["latitude"] as! Double)
        longitudePoint = (arrayInterest["longitude"] as! Double)
        point.coordinate = CLLocationCoordinate2D(latitude: latitudePoint, longitude: longitudePoint)

        myArrayOfMGLPointAnnotation.append(point)

        print("latitude : \(latitudePoint)")
        print("longitude : \(longitudePoint)")


    }

Then you can iterate from myArrayOfMGLPointAnnotation to populate your map

Antoine Streiff
Antoine Streiff
4,649 Points
Antoine Streiff
Antoine Streiff
4,649 Points

Good idea!