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iphonedictionaryannotations
Anthony C
Anthony C

Reputation: 1990

How to Automatically Display Title/Subtitle on Map Annotation (pin)

I am loading an annotation onto my map view. The annotation displays as a pin when the map is loaded.

However, the title and subtitle do not appear on the pin automatically. Currently, the user is required to tap on the pin before the title displays.

Is there a way to get the title to display automatically on the pin when the map is loaded?

(This question is almost the same thing, but not quite there: To display the title for the current loaction in map in iphone because I already have the -title and -subtitle attributes defined in my object.)

Thanks

Upvotes: 11

Views: 10198

Answers (4)

tukool
tukool

Reputation: 132

Adding a follow-up answer (that is applicable to Xcode 11.4 and Swift 5), as I had this exact problem, but the above answers did not work. @zsani is correct in that you need to use MKMarkerAnnotationView (as opposed to MKPinAnnotationView) to get both, but you also have to set the titleVisibility and subtitleVisibility properties (although titleVisibility seems to be on by default with MKMarkerAnnotationView). 

func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
    // do not alter user location marker
    guard !annotation.isKind(of: MKUserLocation.self) else { return nil }

    // get existing marker
    var view = mapView.dequeueReusableAnnotationView(withIdentifier: "reuseIdentifier") as? MKMarkerAnnotationView

    // is this a new marker (i.e. nil)?
    if view == nil {
        view = MKMarkerAnnotationView(annotation: nil, reuseIdentifier: "reuseIdentifier")
    }

    // set subtitle to show without being selected
    view?.subtitleVisibility = .visible

    // just for fun, show green markers where subtitles exist; red otherwise
    if let _ = annotation.subtitle! {
        view?.markerTintColor = UIColor.green
    } else {
        view?.markerTintColor = UIColor.red
    }

    return view
}

Sharing in case anyone else has this same problem.

Upvotes: 0

zsani
zsani

Reputation: 1

Starting in iOS 11, there is a new type of MKAnnotationView called MKMarkerAnnotationView, which can display title and subtitle without being selected. Check https://developer.apple.com/documentation/mapkit/mkmarkerannotationview

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

    guard !(annotation is MKUserLocation) else {
        return nil
    }

    if #available(iOS 11.0, *) {
        let annoView = MKMarkerAnnotationView(annotation: annotation, reuseIdentifier: "HunterAnno")
        annoView.canShowCallout = true
        return annoView
    }

    let annoView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: "HunterAnnoLow")
    annoView.canShowCallout = true
    return annoView
}

Upvotes: 0

Kaz
Kaz

Reputation: 1466

- (void)mapView:(MKMapView *)mv didAddAnnotationViews:(NSArray *)views
{    
    MKAnnotationView *annotationView = [views objectAtIndex:0];
    id<MKAnnotation> mp = [annotationView annotation];
    MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance([mp coordinate] ,350,350);

    [mv setRegion:region animated:YES];    

    [mapView selectAnnotation:mp animated:YES];

}

if you are doing the same thing which is calling the setRegion method, then make sure that you call

[mapView selectAnnotation:mp animated:YES];

after

[mv setRegion:region animated:YES];

Upvotes: 9

Anthony C
Anthony C

Reputation: 1990

The method to call is "selectAnnotation:animated" from MKMapView.

Upvotes: 17

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