I'm calling a webservice and plotting some objects on a MapView.
What I'm failing to understand is should I use MKAnnotationPoint or MkAnnotationView? I'm not sure. When I use MKAnnotation, the pins show up on the map, if I click on them, they show me the title, and subtitle.
If I use MKAnnotationView, the pins show up but when I click on them, nothing happens.
I'm also trying to add the right button callout/chevron looking button but haven't been able to figure that out either.
Here's an example of my code.
MKPointAnnotation mk = new MKPointAnnotation();
MKAnnotationView mkView = new MKAnnotationView();
mk.Coordinate = coord;
mk.Title = tl.Name;
mk.Subtitle = DateTime.Now.ToShortDateString();
mkView.Annotation = mk;
mapView.AddAnotationObject(mk); //not using the MkAnnotationView
I haven't used MonoTouch but the underlying SDK usage is the same as iOS I believe.
MKAnnotation is the protocol/interface to base your annotation data model on. You could also use the pre-defined
MKPointAnnotation class (which implements the
MKAnnotation interface) for your annotation data model objects instead of creating a custom class if all you need is
MKAnnotationView is how the annotation's view should appear and is set in the map view's
viewForAnnotation delegate method (not created inline). Annotation views can be re-used between multiple annotation objects that will have the same appearance (for example a pin image). So theoretically a single
MKAnnotationView instance might be used for multiple annotation objects that implement
MKAnnotation (assuming they are not all on the screen at once).
So you create an
MKAnnotation-based object and pass that in the
AddAnnotationObject) call. Then in the
viewForAnnotation delegate method, you create and return an instance of an
MKPinAnnotationView) is a pre-defined subclass of
MKAnnotationView which provides a default pin image. You can return an instance of
MKPinAnnotationView in the
viewForAnnotation delegate method instead of designing a custom view.
The place where you would create the right callout accessory button is in the
viewForAnnotation delegate method. You create a
UIButton of type
UIButtonTypeDetailDisclosure and set it as the annotation view's
The button press would be handled in the map view's
calloutAccessoryControlTapped delegate method which provides a reference to the annotation view and annotation the callout is in.
The method names given are the ones in iOS but the names in MonoTouch should be similar.