How do I implement MKAnnotation.setCoordinate in a key-value observing compliant way?

According to this documentation if I set an annotation as draggable, I must also implement setCoordinate.


According to this documentation, if I implement setCoordinate I must do so in a key-value observing compliant way.


Have any of you experience with this? Would you show me how this is done? How do you write code that is key-value observing compliant?

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