Questions tagged [mkannotation]

An object that adopts this MKAnnotation protocol manages the data that you want to display on the map surface. It does not provide the visual representation displayed by the map. Instead, your map view either registers particular classes for annotations or the delegate provides the MKAnnotationView objects needed to display the content of your annotations. When you want to display content at a specific point on the map, add an annotation object to the map view. When the annotation’s coordinate is visible on the map, the map view asks its delegate to provide an appropriate view to display any content associated with the annotation.

There is basic MKPointAnnotation class that is useful if you do not need to add your own custom properties to an annotation.

If you do implement your own object to conform to MKAnnotation, there are a few considerations:

1. If you want your map to respond to changes to the coordinate, title, or subtitle of the annotation object, make sure to make these conform to KVO (e.g., in Swift, declare them as dynamic).

2. Probably obvious, but if the annotation views are configured to be draggable, you will want to make the coordinate mutable.

See also

• MKAnnotation documentation
• MKPointAnnotation documentation