Identify MKPointAnnotation in mapView - swift

Question

I have at least 100 diferents Points ... how can associate each point with the position in my 'listOfPoints' assigning a tag in the position associated in viewForAnnotation .
Here i add my Points, some events will have the same title.
var listOfPoints : Array<Events> = [] // List Of all events
//add points to map
for (index, mPoints) in enumerate(listOfPoints) {
var point: MKPointAnnotation! = MKPointAnnotation()
var location = CLLocationCoordinate2D(latitude: mPoints.latitude, longitude: mPoints.longitude)
point.coordinate = location
point.title = mPoints.name
point.subtitle = mPoints.address
self.mapView.addAnnotation(point)
}
//Draw custom pin in the map
func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! {
print("ffff");
var identifier = "CustomAnnotation"
if annotation.isKindOfClass(MKPointAnnotation) {
var pin = mapView.dequeueReusableAnnotationViewWithIdentifier(identifier)
if pin == nil {
pin = MKAnnotationView(annotation: annotation, reuseIdentifier: identifier)
pin.tag = tagPosition; // here
pin.image = UIImage(named: "mapa_pin")
pin.centerOffset = CGPointMake(0, -10)
pin.canShowCallout = true
var pointTitle = pin!.annotation.title! as String
// Callout
var button = UIButton.buttonWithType(.DetailDisclosure) as UIButton
pin!.leftCalloutAccessoryView = button
var image = UIImageView(image: UIImage(named: "mapa_pin"))
pin!.rightCalloutAccessoryView = image
} else {
pin!.annotation = annotation
}
return pin
}
return nil
}
// Print the position
func mapView(mapView: MKMapView!, didSelectAnnotationView view: MKAnnotationView!) {
println(view.tag);
}
How can associated this tag with the position on my 'listOfPoints'
pin.tag = tagPosition;
or is there another way?

Answer 1

I think that is easy and im doing this in an app my.
I customize a class for Annotation from MKAnnotation:
import MapKit
import AddressBook
class MyAnnotation: NSObject, MKAnnotation
{
let identifier : String
let title: String
let subtitle: String
let coordinate: CLLocationCoordinate2D
let color: MKPinAnnotationColor
init(identifier: String, title: String, subtitle: String, coordinate: CLLocationCoordinate2D, color: MKPinAnnotationColor)
{
self.identifier = identifier
self.title = title
self.subtitle = subtitle
self.coordinate = coordinate
self.color = color
super.init()
}
func mapItem() -> MKMapItem
{
let addressDictionary = [String(kABPersonAddressStreetKey): subtitle]
let placemark = MKPlacemark(coordinate: coordinate, addressDictionary: addressDictionary)
let mapItem = MKMapItem(placemark: placemark)
mapItem.name = title
return mapItem
}
}
Now you can use the field identifier from class MyAnnotation in your points:
func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView!
{
if let annotation = annotation as? MyAnnotation
{
let identifier = annotation.identifier
var view: MKPinAnnotationView
if let dequeuedView = mapView.dequeueReusableAnnotationViewWithIdentifier(identifier) as? MKPinAnnotationView
{
view = dequeuedView
view.annotation = annotation
}
else
{
view = MKPinAnnotationView(annotation: annotation, reuseIdentifier: identifier)
view.canShowCallout = true
view.calloutOffset = CGPoint(x: -5, y: 5)
view.animatesDrop = true
view.leftCalloutAccessoryView = UIButton.buttonWithType(UIButtonType.DetailDisclosure) as! UIView
view.rightCalloutAccessoryView = UIButton.buttonWithType(UIButtonType.ContactAdd) as! UIView
view.pinColor = annotation.color
//view.image
//MKAnnotationView 32 x 29
}
return view
}
return nil
}
If you don't understand you can red this excelente article:
http://www.raywenderlich.com/90971/introduction-mapkit-swift-tutorial

Answer 2

The problem is that you are using a plain vanilla built-in MKPointAnnotation. It has no tag property. You need to define your own MKAnnotation class (i.e. a class that adopts the MKAnnotation protocol). That way, it can have any properties you like.

Answer 3

My very easy solution on Objective-C
.h file:
#import <MapKit/MapKit.h>
#interface mapMKPointAnnotation : MKPointAnnotation
#property (nonatomic) NSInteger tag;
#end
and create object with tag:
mapMKPointAnnotation *annotation = [[mapMKPointAnnotation alloc] init];
[annotation setTag:1];
next get tag in method:
-(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation {
static NSString *SFAnnotationIdentifier = #"SFAnnotationIdentifier";
mapMKPointAnnotation *mMKPAnn = (mapMKPointAnnotation *) annotation;
NSString *img = [mMKPAnn tag] == 0 ? #"map_icon" : #"map_icon_active";