I've problem with Objective C at the moment with developing something special.

So - after the MKMapView is initialized and the users position is shown, I would like to implement a method to show annotations which are next to users position. I've stored all necessary points in an SQLite database in a special table. I've two fields - namely `lon`and `lat`- I think it's clear what is meant by that.

Has anybody an idea how to show JUST those annotations which are visible at the screen to be as performant as possible. After the user scrolls the map - it should call the method again to look up in database wether there are also other points which need to be shown...

Thank you very much in advance for your help,

kind regards,

Dominik