topic Re: How to show an annotation on a map in ArcGIS Runtime SDK for iOS Questions

How to show an annotation on a map

SyedMahmud — Sun, 27 Sep 2015 17:50:49 GMT

Now that I have loaded a map in my app, I need to show a marker annotation for a location. Here is the code I'm using but nothing is showing on the map:

CLLocation *location = [[CLLocation alloc] initWithLatitude:douLat longitude:douLon];

AGSPoint *markerPoint = [AGSPoint pointWithLocation:location];

AGSGraphicsLayer* myGraphicsLayer = [AGSGraphicsLayer graphicsLayer];

[self.ibMapView addMapLayer:myGraphicsLayer withName:@"Graphic Layer"];

AGSPictureMarkerSymbol *markerSymbol = [AGSPictureMarkerSymbol pictureMarkerSymbolWithImageNamed:@"existing_project_icon.png"];

AGSGraphic* myGraphic = [AGSGraphic graphicWithGeometry:markerPoint

symbol:markerSymbol

attributes:nil];

// Add the graphic to the Graphics layer

[myGraphicsLayer addGraphic:myGraphic];

[self.ibMapView.callout showCalloutAtPoint:markerPoint forFeature:myGraphic layer:myGraphicsLayer animated:YES];

Please help.

Re: How to show an annotation on a map

MC2 — Tue, 29 Sep 2015 01:09:29 GMT

- Did you set your viewController to be the delegate for callouts (`AGSCalloutDelegate`)?

This is initially `nil` & needs to be set or else annotations won't appear. You can then implement the delegate methods to control what the annotation displays.

Displaying a callout—ArcGIS Runtime SDK for iOS | ArcGIS for Developers

- Not sure it's relevant, but you call `showCalloutAtPoint...` immediately after adding the graphic.

Does `myGraphic` appear? If not, maybe refresh the layer or map before calling this method?

Re: How to show an annotation on a map

GagandeepSingh — Tue, 29 Sep 2015 17:13:30 GMT

Where are you calling the `showCalloutAtPoint` method from? Try doing it from the `mapViewDidLoad` delegate.

Re: How to show an annotation on a map

SyedMahmud — Fri, 02 Oct 2015 01:13:42 GMT

Thanks for responding. I couldn't make much progress. Here is another way asking the same question:

Given the CLLocation *location, how can I draw an annotation on the map?

Any code samples would be highly appreciated.

Thanks.

Re: How to show an annotation on a map

GagandeepSingh — Wed, 07 Oct 2015 17:46:31 GMT

I just replaced the (duoLat, duoLon) in your code with (0, 0) and it worked for me. Can you see the graphic on the map?