Swift, how can I store a custom value for each dropped pin using MKPointAnnotation?

Question

I want to be able to store a custom value for each dropped pin using MKPointAnnotation. Specifically, I want to store some id with each pin and retrieve at calloutAccesoryControlTapped.

Is this a question on how to persist data, or on how to do something with MapKit? What do you mean by "store a custom value"? — Daniel T., Dec 14 '15 at 01:31

score 3 · Accepted Answer · answered Dec 14 '15 at 01:31

You'll have to subclass MKPointAnnotation with a property to store this custom value (I named it tag)

import UIKit
import MapKit
class CustomPointAnnotation: MKPointAnnotation {
    var tag: Int!
}

Creating pins:

let annotation = CustomPointAnnotation()
annotation.coordinate = CLLocationCoordinate2D(latitude: CLLocationDegrees(latitude), longitude: CLLocationDegrees(longitude))
            annotation.title = [insert name]
            annotation.tag = [insert tag]
            self.mapView.addAnnotation(annotation)

And in your mapView delegate's viewForAnnotation, after checking the dequeableAnnotation you do:

  if (annotation is CustomPointAnnotation) {
       pinView?.tag = (annotation as! CustomPointAnnotation).tag
  }

score 1 · Answer 2 · edited May 23 '17 at 12:03

1

Minor edit to Marcos Griselli's answer. pinView needs to be cast to access the custom tag.

if (annotation is CustomPointAnnotation) {
    (pinView?.annotation as! CustomPointAnnotation).tag = (annotation as! CustomPointAnnotation).tag
}

edited May 23 '17 at 12:03

Community

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1

answered Mar 19 '16 at 00:05

Gr8Khan

11
3

Swift, how can I store a custom value for each dropped pin using MKPointAnnotation?

2 Answers2