mike vorisis mike vorisis - 3 months ago 17
Swift Question

How can I detect which annotation was selected in MapView

I've made a few annotations inside the Map and when I tap on them I see some informations and I have a button that opens Maps and with the right information that I can't take it should draw me my route.

Here is my code:

I have 2 arrays of double for my lat & lon That I filled them from my query.

var lat = [Double]()
var lon = [Double]()


These lines are for filling annotations

self.annot = Islands(title: object["name"] as! String, subtitle: object["address"] as! String, coordinate: CLLocationCoordinate2D(latitude: (position?.latitude)!, longitude: (position?.longitude)!), info: object["address"] as! String)

self.map.addAnnotations([self.annot])


This is where the annotation is creating:

func mapView(mapView: MKMapView, viewForAnnotation annotation: MKAnnotation) -> MKAnnotationView? {

let identifier = "pin"

if annotation.isKindOfClass(MKUserLocation) {
return nil
}

let image = UIImage(named: "car")
let button = UIButton(type: .Custom)
button.frame = CGRectMake(0, 0, 30, 30)
button.setImage(image, forState: .Normal)
button.addTarget(self, action: #selector(Map.info(_:)), forControlEvents:UIControlEvents.TouchUpInside)

var annotationView = mapView.dequeueReusableAnnotationViewWithIdentifier(identifier)
if annotationView == nil {
annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: "pin")
annotationView!.canShowCallout = true
annotationView!.image = UIImage(named: "annotation")
annotationView!.rightCalloutAccessoryView = button

}
else {
annotationView!.annotation = annotation
}

return annotationView

}


And finally this is the button's function where I should pass the right info ( and where the problem is)

func info(sender: UIButton)
{

let latitute:CLLocationDegrees = lat[sender.tag]
let longitute:CLLocationDegrees = lon[sender.tag]

let regionDistance:CLLocationDistance = 10000
let coordinates = CLLocationCoordinate2DMake(latitute, longitute)
let regionSpan = MKCoordinateRegionMakeWithDistance(coordinates, regionDistance, regionDistance)
let options = [
MKLaunchOptionsMapCenterKey: NSValue(MKCoordinate: regionSpan.center),
MKLaunchOptionsMapSpanKey: NSValue(MKCoordinateSpan: regionSpan.span)
]
let placemark = MKPlacemark(coordinate: coordinates, addressDictionary: nil)
let mapItem = MKMapItem(placemark: placemark)
mapItem.name = name[sender.tag]
print(sender.tag)
mapItem.openInMapsWithLaunchOptions(options)
}


As you can see I tried with sender tag but with no luck.

EDIT: My Custom Annotation class

class Islands: NSObject, MKAnnotation {

var title: String?
var addr: String?
var coordinate: CLLocationCoordinate2D
var info: String?
var subtitle: String?

init(title: String, subtitle: String, coordinate: CLLocationCoordinate2D, info: String) {
self.title = title
self.coordinate = coordinate
self.info = info
self.subtitle = subtitle

}

}

Answer

For that you can use selected Annotation from didSelectAnnotationView, then store that annotation to instance variable and after that used annotation in your Button action method.

var selectedAnnotation: MKPointAnnotation?

func mapView(mapView: MKMapView, didSelectAnnotationView view: MKAnnotationView) {
    self.selectedAnnotation = view.annotation as? MKPointAnnotation
}

func info(sender: UIButton) {
    print(selectedAnnotation?.coordinate)
}

Edit: As of you have custom MKAnnotation class you need to use that.

var selectedAnnotation: Islands?

func mapView(mapView: MKMapView, didSelectAnnotationView view: MKAnnotationView) {
    self.selectedAnnotation = view.annotation as? Islands
}    
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